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These calculators are offered free of charge  some by vendors and others by individuals. Some are standalone and others function online via Java from the web page. The majority are engineering calculators, but some are scientific calculators, some are amateur radio calculators, and some are electrician type calculators.
See also the RF Cafe Online Calculators!!
A good way to find on this page what you need is do a browser page search.
If you cannot find what you are looking for here, try the Software page.
AccelWare
accelware.com
Unit Conversion Tool  powerful, intuitive, and easytouse utility
for quick and accurate conversion between almost every possible unit of measure, from one system to another. The
latest version includes more than 2200 units in 78 categories. The categories include: length, area, speed, mass,
numbers, volume, time, density, force, pressure, energy, power, flow, temperature, angle, light, fractions, data
transfer, and many more. Fully functional Online version now available.
AlphiMAX P2P Signal Propagation Calculator
alphimax.com/ptp/overview
A very nice graphical
interface tools that enables you to compare manufacturers, while taking into account the terrain of your area, terrain
type, climate, antenna type, define fade margin and more. Use of a GPS database produces a very accurate elevation
profile between antenna locations.
Antenna Design Calculator
qpar.com/capabilities/software/microwaveantennacalcinstructions
The upper section relates antenna diameter and frequency to gain and beamwidth. Using the scroller, set the beamwidth
against the 3 dB or 10 dB marker, and read off the corresponding frequency and diameter; or set the frequency against
the diameter and read off the beamwidth. By Qpar Angus.
Antenna Power Tools
awapps.commscope.com/downloads
Andrew's complete collection of antenna
planning software.
Antenna System Evaluator
n6ach.com/calc/antenna.html
Evaluate consequences of SWR &
feedline losses, KD6DKS.
Antenna System Planner
awapps.commscope.com/downloads/amsp/
By Andrew Corporation.
ATC QuickCalc
atceramics.com/designsupport
Capacitor Calculation, American Technical
Ceramics.
Attenuator Calculators
rfcafe.com/references/spreadsheets/attencalcss.htm
"T" and Pi
topologies using online interactive Excel OWA technology. Here is a
JavaScript version.
Attenuator Calculator
microwaves101.com/encyclopedia/calcattenuator.cfm
Four topologies:
"T", Pi, BridgedT, Reflection.
Attenuator Calculator
http://www.phasematrix.net/phasematrix/rfdesigntools/teeapiattenuatorcalculator
Very nicely done online interactive calculator  by Microwaves & RF, Paul Khanna of Phase Matrix
Attenuator Calculator
db0smg.afug.unigoettingen.de/~dk1rm/tools/att.html
DK1RM
Here
is a JavaScript version for Pi and T attenuators  auf Deutsch. Here it is
in English
babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bfhome&trurl=http://db0smg.afug.unigoettingen.de/~dk1rm/tools/index.html&lp=de_en&btnTrUrl=Translate
Other calculators available by clicking on the
Tools
db0smg.afug.unigoettingen.de/~dk1rm/tools/index.html
link.
Attenuators
sandiego.edu/~ekim/e194rfs01/minl_atten/minlosatten.html
Minimum loss attenuator
design.
AVX SPIMIC
avxcorp.com/SpiApps
Capacitor calculation.
Besser Associates
besserassociates.com
4159493300 / Los Altos, CA
Reflectometer
bessernet.com/Ereflecto/tutorialFrameset.htm
Butterworth Filter
Designer
bessernet.com/Ebutterworth/tutorialFrameset.htm
dBmtodbW
bessernet.com/jobAids/dBmCalc/dBmCalc.html
and Smith Chart applets
bessernet.com/jobAids/jSmith/jSmith.html
Broadcast Engineer's Calculators
bobgroome.com
by SOB (Sweet Old Bob)
HD cost estimates;
Antenna, coax & other losses, Dual input HD Antenna TPO's; Convert units of Measure, High level combining; Look
up ballpark coax loss & power ratings; Dehydrator size for up to 4 coax runs; Beam tilt and/or null fill Needed;
STL path calculator for 950 paths; FM antennas; Gain of parabolic antenna; Channel vs. frequency; FM/TV; Plot Fresnel
path; AM tower height & rigid coax; Power calculations; BTUs; Conduit size for your wire bundle; Does FM pattern
meet FCC limits; Ohm's Law; Wire and circuit size for deicers; FCC Official RFR Model Program Link
Broadcast Engineering Related Calculators
allenk.home.infionline.net/engpgms.html
Allen's
Broadcast Engineering Extravaganza
Lots of good JavaScript calculators: AM Common Point / Antenna Current Calculator,
FM Transmitter Power Output Calculator, RPU/STL Transmitter Frequency Tolerance Calculator, AM Transmitter Harmonics
Calculator, Free Space Loss Between Isotropic Radiators Calculator, 0.6 First Fresnel Radius Zone Calculator, VSWR
Calculator, Coaxial Cable Loss Calculator, Coax Cable Loss/Antenna Gain Calculator, Opamp Gain Calculator
Cable Performance Calculators
timesmicrowave.com/cable_calculators
Calculate loss &
power, VSWR & return loss, by Times Microwave.
Calc101
calc101.com
By webMathematica, scores of online interactive calculators for algebra,
trigonometry, calculus, matricies, linear equations.
Calculator Edge
calculatoredge.com
This has to be one of the Web's largest collection
of unique (as opposed to copied) online calculators. Each of these topics has many calculators within them. General,
Civil Engineering, Optical Engineering, Mechanical Engineering, Plastics Engineering, Metallurgy, Electronics Engineering,
Electrical Engineering, Chemical Engineering, Physics, Ceramics, Oil & Gas, Structural Engineering.
CapCAD
dilabs.com/applications/capcad.aspx
Capacitor calculation, by Dielectric Laboratories.
Chemandy Electronics
chemandy.com/calculators/calculator_index.htm
+62 31 8914627 / Jawa
Timur, Indonesia
Large selection of online interactive calculators for RF design, including attenuators, capacitance,
resonance, RF traps, and microstrip impedance. Design, development and small scale manufacture of simple RF and
Audio items. We also have the capability for ATE programming in Labview, HP/Agilent Vee or Visual Basic, and can
produce associated test jigs.
Chemistry Calculators
1728.org/indexche.htm
Boyle's Law, Charles' Law, STP, molar volume,
etc, by 1728 Software Systems.
Choke Designer
powerdesigners.com/InfoWeb/calculators/ChokeCalc/dc_choke.shtm
Inductor
values using standard cores.
Chris Gillings' Cardboard Slide Rule Collection
chris.gillings.com/collect/slide
If you
are at all nostalgic and also are a nerd, then you will drool over this collection by Chris Gillings. Andrew Antenna
and Propagation Computer, Andrew Parabolic Antenna System Computer (1957), Andrew Parabolic Antenna System Computer
(1964), Andrew Transmission Line Computer, BioMate, Blackwell Calculator, Althouse Chemical Co., Marconi Signal
Source Calculator, Motorcraft Gasculator, National Standard Company Strip Calculator, Proportion Wheel, Radiac,
No.1, Raytheon Radar Performance Calculator, Readymix Concrete Calculator, and many more. They're all here!
CoilSim
nathaniyer.com/images/coilsim.jpg
Basic ciol inductor calculator applet, by Nathan
Iyer
Coordinate System Converter
randomsciencetools.com/maths/coordinateconverter.htm
Convert
between rectangular, polar, spherical, and cylindrical coordinates.
Connect802 Antenna System Designer
connect802.com/antenna_c_main.php
An online calculator
that creates a wireless network antenna system design report based on various parameters that you provide. It will
help you predict endtoend performance and evaluate your network design when you plan a pointtopoint, or pointtomultipoint
outdoor wireless network deployment. You'll be able to analyze the radio link and tune network parameters for optimal
link suitability.
ConvertIt
convertit.com
Huge collection of converters and calculators.
Cubicle Quad Antenna Calculator
softcom.net/users/kd6dks/quad.html
Determine dimensional
quantities  javascript.
Daycounter, Inc. Engineering Services
daycounter.com/Calculators
Calculators for switching
power supply, air core inductors, SallenKey LP Butterworth filter, L matching network, standard resistor value,
PI & T pad attenuator, reactance, series  parallel impedance conversion, ZSY parameter conversion, Rollet
Stability (K) Factor, complete RF amplifier design & analysis, LC resonance.
Dielectric Constant of Water (Complex)
randomsciencetools.com/electronics/water_dielectric.htm
Calculates the real and imaginary parts of the dielectric constant for water, sung temperature, salinity, and frequency.
By Gareth Harris
DigSim
embedded.eecs.berkeley.edu/research/weld/yoyodyne_demo_docs/DigSim/DigSim.html
Digital schematic editor & simulator from Berkeley.
Dirac Delta
diracdelta.co.uk/science/source/c/a/calculations/source.html
"Science and
engineering encyclopedia." Hundreds of JavaScript calculators, definitions, historical information, etc.
eCalc
ecalc.com
Advanced features including support for complex numbers, unit conversion,
base conversion, and has a built in equation solver. eCalc is one of the best calculators on the web and runs completely
in your browser without requiring any special plugins. Electrical engineers will find eCalc's complex math especially
useful since it supports both rectangular and polar formats. eCalc supports both RPN and Algebraic Input Modes.
engApplets
engapplets.vt.edu
Java applets for engineering education.
Engineering Calculators on Educypedia
educypedia.be/electronics/electroniccalculatorrf.htm
A pretty good collection of links to online calculators  satellites, attenuators, Smith Chart, VSWR, free space
loss, etc.
EIA Equipment Rack Stencils for
Visio
By Kirt Blattenberger.
Electromagnetic Field Applets
Very nice graphical output and user interface, with animation.
 Wave propagation
amanogawa.com/archive/PlaneWave/PlaneWave2.html
 Field Polarization
amanogawa.com/archive/Polarization/Polarization2.html
 Oblique Incidence
amanogawa.com/archive/Oblique/Oblique2.html
 Oblique Incidence on Lossy Medium
amanogawa.com/archive/ObliqueLossy/ObliqueLossy2.html
 Parallel Plate Waveguide
amanogawa.com/archive/ParallelWaveGuide/ParallelWaveGuide2.html
 Rectangular Waveguide
amanogawa.com/archive/RectWaveGuide/RectWaveGuide2.html

Dielectric Slab Waveguide
amanogawa.com/archive/DielectricWaveGuide/DielectricWaveGuide2.html
everything RF
everythingrf.com/rfcalculators
A nice collection of RF calculators.
 Attenuator Calculator
everythingrf.com/rfcalculators/attenuatorcalculator
 Microstrip
Impedance Calculator
everythingrf.com/rfcalculators/microstripcalculator
 Coax Impedance
Calculator
everythingrf.com/rfcalculators/coaxcalculator
 Cascaded Noise Figure Calculator
everythingrf.com/rfcalculators/cascadednoisefiguregaincalculator
 Skin Depth Calculator
everythingrf.com/rfcalculators/skindepthcalculator
 Wavelength Calculator
everythingrf.com/rfcalculators/wavelengthcalculator
 dBm to Watt Calculator
everythingrf.com/rfcalculators/dbmtowatts
 Watt to dBm
Calculator
everythingrf.com/rfcalculators/watttodbm
Electric Field Units Converter
compeng.com.au/emc_conversion_tables_field_strength_calculator.aspx
Online converter by Compliance Engineering. Wavelength to frequency, V/m to dBuV/m V/m dBuV/m, dBm to dBuV/m (50Ω),
mW/cm^2 to W/m^2 (Free Space), mW/cm^2 to V/m (Free Space), mW/cm^2 to A/m (Free Space), mW/cm^2 to pJ/cm^2 (Free
Space), W to dBm (50Ω), dBm to V (50Ω), V to dBm (50Ω)
Excalibur RPN Calculator Applet
freewareguide.com/OldGoodFreeware/Excalibur.html
Excalibur
does not use more conventional "algebraic" notation like many lowend calculators on the market. Instead it uses
the highpowered parenthesisfree RPN notation (Reverse Polish Notation).
Fast Fourier Transform Calculator
randomsciencetools.com/maths/FFT.htm
Do an FFT by
entering the time domain data in the Time Domain Data box with each sample on a new line. For complex (I and Q)
data, the real and imaginary components should be on the same line separated by a comma. Do an Inverse FFT by entering
the frequency domain data in the Frequency Domain Data box with each sample on a new line. For complex (I and Q)
data, the real and imaginary components should be on the same line separated by a comma.
Field Strength Calculator
giangrandi.ch/electronics/anttool/field.html
Enter frequency
and antenna gain, then any one of received power, electric field strength, magnetic field strength, or power density
and this calculates the others.
Field Strength Calculator
compeng.com.au/emc_conversion_tables_field_strength_calculator.aspx
V/m, dBuV/m, dBuA/m, pT, dBpT, Tesla, Guass, A/m, mW/cm^2 & W/m^2. From Compliance Engineering.
Filter Coupling Matrix Calculator
gwtsoft.com
Facilitates synthesis of N+2 coupling matrices
for Chebyshev bandpass filtering functions, with arbitrary finiteposition transmission zeroes.
Filter Design Spreadsheets
Waveguide Filter Designer
rfshop.com.au/portals/22/supp/wgfil2.xls
Combline and Interdigital Filter Design Spreadsheet
rfshop.com.au/portals/22/supp/c&i2.xls
RF Shop
rfshop.co.uk
Financial & Mortgage Calculators
mortgageloan.com/calculator
Over 100 personal finance
calculators.
Financial Calculators
1728.org/indexfin.htm
Loan amortization, interest, loan payment
by 1728 Software Systems.
FM Antenna Calculator
eriantennas.com/AntennaCalculator/FMCalca.htm
by ERI (Electronics
Research, Inc.)
Plots FCC 60 dBu contours right on the page. Also many PDF files with Engineering Tables: Geotechnical
Investigations for Antenna Support Structures, Classes of FM Stations, FM Broadcast Channels, AM Tower Heights by
Frequency, 54 dBu Contour Distances, 60 dBu Contour Distances, Site Plot Plan, Wind Speed Map, Ice Probability Map,
Antenna Support Structure Design Radius of Curvature Requirement.
FreeSpace Loss Calculator
ezy.net/calculations/freespaceloss
Other calculators for
 Fresnel Clearance Zone
ezy.net/calculations/fresne
 EIRP
ezy.net/calculations/eirp
 Distance between two points using
ezy.net/calculations/distance
 Latitudes and
Longitudes
ezy.net/calculations/distance
Flex Analysis
rogerscorp.com/cmu/flexform.htm
Evaluate thermal/mechanical performance
of flex circuits by Rogers Corporation.
Frequency Finder  Open TV Channel Applet
sennheiserusa.com/frequencyfinder
Sennheiser
searches the FCC database for an open channel for running interferencefree wireless systems.
Fresnel Clearance Zone Calculator
terabeam.com/support/calculations/fresnelzone.php
By
TeraBeam
Fresnel Zone Calculator
wirelessconnections.net/calcs/FresnelZone.asp
The calculator will
generate the radius of the first Fresnel zone only (at the obstacle point or the midpoint), the 60% (no obstacle)
radius and the height of the earth curvature at the midpoint of the Total link distance. By Wireless Connections.
HiDigit
binarythings.com/hidigit
Scientific calculator with extended capabilities. Advantages
include a simple input format even for the most complicated scientific formulas; i.e., enter "10pi" instead of "10*pi"
or complex numbers as "1+2i".
HP48 Calculator Programs
hpcalc.org/hp48/science/electricity
Lots of engineering programs.
Impedance Matching Network Designer
sandiego.edu/~ekim/e194rfs01/jwmatcher
John Wetherell,
Berkeley, CA.
Inflation Calculator
westegg.com/inflation
U.S., Canadian, and Italian versions. Enter
begin and end dates and get equivalent dollar values,
by S. Morgan Friedman.
JPole Antenna Calculator
hamuniverse.com/jpole.html
Enter the operating frequency and
calculate antenna dimensions  online.
Julian Date Calculator
1728.com/calendar.htm
Calculates JDs for a given month.
Karnaugh Minimizer
karnaugh.shuriksoft.com
A tool for developers of small digital devices
and radio amateurs, also for those who is familiar with Boolean algebra and Karnaugh Map optimization method, best
suits for electrical engineering students. By Shurik Soft.
LC Filter Designer
wwwusers.cs.york.ac.uk/~fisher/lcfilter
This is an interactive design
package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs). From University
of York.
Link Budget Calculator
wirelessconnections.net/calcs/BudgetCalc.asp
A towertotower,
overtheair JavaScript calculator, by Wireless Connections.
LOGInterMod
logbook.freeserve.co.uk
Leslie Green / U.K.
A Windows program (Freeware)
that calculates twotone intermodulation products up to the 30th order.
Look Angle Calculator
intelsat.com/resources/satellitedatapas/calclookangle.asp
Use
our look angle calculator to calculate the pointing angles your dish needs in order to receive a particular satellite.
Martindale's Calculator OnLine Center
martindalecenter.com/Calculators.html
More than
20,000 calculators  this site has grown incredibly over the years.
Math eBook
mathebook.net
This website is fully interactive and will allow kids to practice
and learn math with ease. It is designed to help students of different grades, starts from Kindergarten, Elementary,
Middle School and High School Math. The goal of this website is to provide new education tools to teachers, parents
and off course students who can benefit from it. Mathebook.net has Online Tutorials as well as Downloadable pdf
tutorials.
MegaConverter2
megaconverter.com/mega2
Multifunctional units converter.
Microwave Calculator
jfwindustries.com/RF_Conv_Sign_up.htm
Free From JFW Industries.
Microwave Impedance Calculator (MWIJ 1.0)
rogerscorp.com/acm/technology
Substrate line
impedance calculator by Rogers Corporation. Written in Java  nice.
Mixer Spur Calculator
hittite.com/tools/Spurcalc/SpurCalc25JarLockE.htm
By Hittite Microwave.
Mortgage Calculators
mortgagecalculator.org/calculators
Large variety of financial calculators
for mortgages, principal calculation, cost per thousand, affordability, income requirements, FHA, refinance, HELOC,
loan comparison tools, points, rent vs buy, & more.
Mortgage Calculator
mortgagecalculator.net
8 different calculators: Mortgage calculator,
Affordability, Early PayOff, Interest Only, Advanced Mortgage calculator, Mortgage Refinance, Basic Amortization,
and Comparison calculator
N Calculators
ncalculators.com/electronics
Electronic circuit design calculators can assist
you to solve, analyze and determine the circuit design with capacitors, inductors, resistors, diodes, transistors,
etc. Many other types of financial, mathematical, and science calculators.
Online Conversion
onlineconversion.com
Convert just about anything to just about anything
else.
PCB Trace & Via Calculator
skottanselektronik.com
A very complete set of online calculators
for microstrip, embedded, and differential microstrip impedance; stripline and differential stripline impedance;
stripline and microstrip crosstalk; currentcarrying capacity of traces and thermal vias; heat dissipation of thermal
vias. By Sören Nilsson.
PCB Trace Width
geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm
Conductor thickness,
ampacity, temperature rise.
PCB Trace Impedance Calculator
emclab.mst.edu/pcbtlc2
Online interactive calculator for
stripline and microstrip, by U. of MissouriRolla EMC Lab.
PDA Calculator Software
adacs.com/menu/PDAcalc_matrix.php
ADACS has a nice collection
of software for engineering, scientific and financial applications.
PLL Phase Noise Calculator
hittite.com/tools/PLLCalc/PLLCalc.htm
By Hittite Microwave.
Poles & Zeros Calculator
thole.org/manfred/polezero/en_idx.html
Move the poles and
zeros to see the frequency domain response.
Power Calculator
macgen.com/calcul.html
Motor & line calculations, conversions.
Power Dissipation vs. Die Temperature Calculator
analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/powertemp/powertemp.html
By Analog Devices.
Power Switch Designer
fairchildsemi.com/products/analog/fps_designer_software.zip
By Fairchild Semiconductor.
Power Supply
national.com/appinfo/power
National's power supply design tool.
Power & Voltage Converter
giangrandi.ch/electronics/anttool/decibel.html
Convert between
units of dBm, dBW, watts, dBV, volts.
Radiated Power Calculator
compeng.com.au/emc_conversion_tables_power_calculator.aspx
ERP, EIRP, dBuV/m, dBm & mW. From Compliance Engineering.
Radiated Power Converter
compeng.com.au/emc_conversion_tables_power_calculator.aspx
Online converter by Compliance Engineering.
EIRP (mW) to ERP (mW) to dBuV/m @ 3m to dBuV/m @ 10m.
Radio Calculators
qsl.net/wa2whv/radiocalcs.shtml
Pi attenuators and air inductor java
calculators by Jim Hawkins.
Random Science Tools and Calculators
randomsciencetools.com/index.html
The intention
of this site is to produce scientific tools and calculators, and store information which will be useful to scientists,
engineers, students and enthusiasts.
Chemistry
randomsciencetools.com/chemistry/index.htm
Electronics
randomsciencetools.com/electronics/index.html
Math
randomsciencetools.com/maths/index.htm
Physics
randomsciencetools.com/physics/index.htm
Resistor Color Code Calculator (Reversible)
searchingtabs.com/rcolor/rescolor.htm
This
resistor color code calculator also provides a table of nearest standard values of resistors for standard tolerances.
Resistor Ratio Calculator
usna.edu/Users/ee/cameronc/Tutorials/ResistorRatio.html
Finds
R1/R2 combinations using standard resistor values, by Bennet Blake.
Resistor Ratio Calculator
logbook.freeserve.co.uk
Leslie Green / U.K.
A resistive network
calculator for problems using two or three fixed resistors. You have to use standard values, but you need some silly
ratio like 3.245 V from a 10 V source. This program helps you to pick the optimum resistor values for simple resistor
dividers or opamps (inverting and noninverting). Freeware.
RF Cafe Online Calculators
Many online calculators
for noise figure/temperature, filter responses, voltage dividers, waveguide cutoff frequency, VSWRreturn lossreflection
coefficient conversions and more, by Kirt Blattenberger.
RF Calc
milmega.co.uk/downloads/rfcalc.exe
General purpose engineering calculator by MilMega
 includes table of physical constants, component parameter calculators (capacitance, inductance, resonance, pads),
multiple transmission line calculators.
RF Calculator
compeng.com.au/emc_conversion_tables_rf_calculator2.aspx
Wavelength, dBm, dBuV, W, dBuV/m, mW/cm^2, pJ/cm^2, V & VSWR. From Compliance Engineering.
RF & Analog Tutorials w/Java Apps Website
amanogawa.com
This is a VERY nice collection
of Java applets and some PDF format tutorials. Antenna patterns, waveguide modes, electromagnetic wave fronts, interactive
Smith chart, transmission lines, standing waves, resonant circuits, radiation of wires, crosstalk, much more. By
Amanogawa.
RF Calculators
fcc.gov/mb/audio/bickel/findvalues.html
On the Federal Communications Commission
website.
RF Calculators
phasematrix.com/Microwave_Components/components_webapps.html
by Phase Matrix, San Jose, CA
Here is a very nice collection of interactive calculators: Tee & Pi Attenuators,
Power to Voltage in a 50 ohm system, Converting dB to Ratio, mW to dBm, dBW, dBV & Volts in a 50 ohm system,
Converting Phase Noise To Jitter (Part 1), Reflectometers Conversions: Interconverting VSWR, Return Loss, Reflection
Coefficient and Mismatch Loss ,Designing Equal or Unequal Split Wilkinson Power Dividers, Cascading Three Stages
for Gain, NF & P1 dB, VSWR Mismatch Analysis and Power Uncertainty, Measuring Oscillator Output VSWR using
Power Load Pulling, Microstrip Line Design, Designing Unequal Resistive Power Dividers/Couplers.
RF Cascade Workbook 2003
RF, system, cascade for Excel spreadsheet.
RF Cascade Workbook 2004
RF, system, cascade for Excel spreadsheet.
RF Cascade Workbook 2005
RF, system, cascade for Excel spreadsheet.
RF Workbench
RF, system,
up/downconverter, spurious analysis, budget  best value out there.
RLC Tuned Circuit Calculator
cvs1.uklinux.net/calculators
Enter values for R, L, C, and/or
frequency and it calculates the others. Also calculate capacitor and inductor impedance. Ohm's Law and RC time constant
calculator.
RPN Calculator
This
handy Reverse Polish Notation calculator was written by the infamous Kelly Painter. Note the logo in the upper right
corner (hover your cursor over it).
RW Calc Software
radiowavesinc.com/cgibin/index.cgi/Technical+Stuff/RW+ToolBox+Software+Series
Free from RadioWaves, several RF utilities, such as converters, farfield calculation, Fresnel zone clearance and
free space propagation.
Sage Notebook
sagenb.org
Spreadsheets for many realms of science and engineering. All
are free downloads
SatelliteRelated Calculators
satellitecalculations.com
Sun interference, powertonoise,
tilt angle, antenna gain and more than thirty other calculators.
Satellite Link Budget Calculator
satsig.net/linkbugt.htm
Uplink/downlink calculator, Satellite
Signals site.
Signals & Noise
users.ece.gatech.edu/users/gtz/java
Java applet for exploring random processes.
Smith
Chart for Visio
By Kirt Blattenberger.
Sunshine Design Engineering Services
astrocalculator.com
Ramona, CA
Design specialties
 hardware, CAD and software engineering. Test Engineering Services  20 years experience RF/Microwave and Semiconductor
Parametric Test. Electronic Calculator  Multiple pages of calculators for capacitance, resistance, inductance,
attenuation, microstrip, resonance, etc. Many astronomical calculators.
SWR Calculator
vnahelp.com/swrcalc_screen.html
VNA Help  for microwave network analyzers.
Toroid Calculator
chemeng.ed.ac.uk/people/jack/radio/design_toroid.html
Uses standard
cores; e.g., T50.
Tower Planner
awapps.commscope.com/downloads/towerplanner/default.aspx
Andrew's handy
calculator for height, wind speed, terrain, etc.
Transmission Line Calculator
circuitcalculator.com/wordpress/2007/03/06/transmissionlinecalculator
The CircuitCalculator.com Website
Excelbased calculator
Transmission Line Calculator
fermi.la.asu.edu/w9cf/tran/index.html
By Kevin Schmit, W9CF
TRL / LRL Calculator
electrophotonics.com/index.php?l=page_view&p=TRL
TRL (Through,
Reflect, Line) and LRL (Line, Reflect, Line) reference plane calculators provided by ElectroPhotonics.
TXLine
Transmission
Line Calculator by Applied Wave Research. This file seems to be no longer available on the AWR website.
Ultra Converter I
1728.org/convert.htm
Ultra Converter II
1728.org/convert2.htm
If these to converters don't have it, you don't need to convert it! by 1728 Software.
Vertex 42
vertex42.com
Engineering calculators & converter applets & spreadsheets.
Excel templates
vertex42.com/ExcelTemplates
financial calculators
vertex42.com/Calculators/financialcalculators.html
calendars
vertex42.com/calendars
We also host
The Excel Nexus
vertex42.com/ExcelLinks
The ultimate directory of 3rdparty Microsoft Excel® resources, including addins, templates, tutorials, and consulting
services.
Virtual Slide Rules
Standard slide rule
engcom.net/component/option,com_sliderule/Itemid,73
EngCom.net
Pickett slide rule
antiquark.com/sliderule/sim/virtualsliderule.html
Antiquark.com
Voltage Divider Resistor Calculator
web.ics.purdue.edu/~mrushako/resistor_table.html
Table
of tworesistor voltage dividers using standard 5% tolerance resistor. Opamp feedbackinput resistor pairs can also
be specified. Very clever cell shading scheme for indicating deviation from exact ratio that is specified. Provided
by Mark Rushakoff.
VSWR Calculator
bessernet.com/Ereflecto/tutorialFrameset.htm
Animated version from BesserNet.
VSWR, Power Converter, Inductance Calculator
mwelisra.com/FreeEngineeringSoftware/free_engineering_software.htm
97236175082 / Israel
Free downloadable VSWR, power converter, inductance calculator, written by Dr. Ronen Holtzman
for Elisra Microwave Division engineers.
Waveguide Filter Dimension and Electrical Response Calculator
guidedwavetech.com
By Guided
Wave Technology.
Waveguide Applets
Very nice graphical output and user interface, with animation.
 Parallel Plate Waveguide
amanogawa.com/archive/ParallelWaveGuide/ParallelWaveGuide2.html
 Rectangular Waveguide
amanogawa.com/archive/RectWaveGuide/RectWaveGuide2.html

Dielectric Slab Waveguide
amanogawa.com/archive/DielectricWaveGuide/DielectricWaveGuide2.html
Web Cool Tools
webcooltools.com/engineeringdesigntool.shtml
RF & microwave design
applets that use numerical input or sliders for setting parameters.
WRConnect
goulouev.com/connector/index.htm
Waveguide structure design tool.
Corrugated
LowPass Filter Design Workshop.
goulouev.com/oncorr/index.htm
Waveguide & EM Calculators
amanogawa.com/waves.html
This is a very nice Java/JavaScriptbased
set of calculators with a great user interface.
Wireline
Calculator
WiseCalc
wisecalc.com
WiseCalc is the complete mathematical text engine calculator for
your computer.
 it's FREE!
 it has a multiline texteditor type of interface
 it has 450+ unit conversions
builtin
 it has hundreds of functions builtin
 it can save and open calculation pages
 it can evaluate
builtin and user definable functions,
units, constants, and matrices
WLAN Link Planning Calculators
swisswireless.org/wlan_calc_en.html
Many calculators for
wireless link planning: Fresnel zone, diffraction, path loss, link budget, cable loss.
Yagi Java Applet
fermi.la.asu.edu/w9cf/yagipub/index.html
Change frequency, element diameter,
and number of segments.