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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
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  Engineering calculators & converter applets & spreadsheets.
Virtual Slide Rules
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.
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.