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.
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.
EIA Tube Bases for Visio
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.