AccelWare
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.
All About
Circuits This is a nice assortment (83 at this
time) of electrical & electronics parameter calculators, with a couple mechanical
types as well. There are many types of substrate impedance and line dimension calculators,
and calculators for voltage dividers, inductance and capacitance, coax lines and waveguides,
amplifiers, impedance matching, free space loss, EIRP, radar range, and noise figure.
AlphiMAX P2P
Signal Propagation Calculator 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.
Analog Devices Calculators
Big list of online calculators
Antenna System
Evaluator Evaluate consequences of SWR & feedline losses, KD6DKS.
ATC
TechSelect Capacitor Calculation, American Technical Ceramics.
Attenuator
Calculators "T" and Pi topologies using online interactive Excel OWA
technology.
Attenuator Calculator Four topologies: "T",
Pi, BridgedT, Reflection.
Attenuator Calculator DK1RM Here is a JavaScript version
for Pi and T attenuators  auf Deutsch.
Attenuators Minimum loss attenuator design.
Besser Associates
4159493300 / Los Altos, CA
Broadcast Engineering Related Calculators 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 Calculate loss & power, VSWR &
return loss, by Times Microwave.
Calc101 By
webMathematica, scores of online interactive calculators for algebra, trigonometry, calculus,
matricies, linear equations.
Calculator Edge
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
Capacitor calculation, by Dielectric Laboratories.
Chemandy Electronics +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
Boyle's Law, Charles' Law, STP, molar volume, etc, by 1728 Software Systems.
Choke Designer Inductor values using standard cores.
Coordinate System Converter Convert between rectangular,
polar, spherical, and cylindrical coordinates.
Connect802
Antenna System Designer 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
Huge collection of converters and calculators.
Daycounter,
Inc. Engineering Services 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) Calculates the
real and imaginary parts of the dielectric constant for water, sung temperature, salinity,
and frequency. By Gareth Harris
Dirac Delta "Science and engineering encyclopedia." Hundreds
of JavaScript calculators, definitions, historical information, etc.
eeWeb
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
Java applets for engineering education.
Engineering Calculators on Educypedia 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 
Field Polarization 
Oblique
Incidence 
Oblique Incidence on Lossy Medium 
Parallel Plate Waveguide 
Rectangular Waveguide 
Dielectric Slab Waveguide
everything
RF A nice collection of RF calculators. 
Attenuator Calculator 
Microstrip Impedance Calculator 
Coax Impedance Calculator 
Cascaded Noise Figure Calculator 
Skin Depth Calculator 
Wavelength Calculator 
dBm
to Watt Calculator 
Watt
to dBm Calculator
Excalibur RPN Calculator Applet 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 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 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.
Filter Coupling Matrix Calculator
Facilitates synthesis of N+2 coupling matrices for Chebyshev bandpass filtering functions,
with arbitrary finiteposition transmission zeroes.
Filter Design Spreadsheets
Waveguide
Filter Designer
Combline
and Interdigital Filter Design Spreadsheet
RF Shop
Financial &
Mortgage Calculators Over 100 personal finance calculators.
Financial Calculators
Loan amortization, interest, loan payment by 1728 Software Systems.
FM Antenna Calculator 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
Fresnel Clearance
Zone EIRP
Distance between
two points using Latitudes and Longitudes
Flex
Analysis Evaluate thermal/mechanical performance of flex circuits by
Rogers Corporation.
Frequency
Finder  Open TV Channel Applet Sennheiser searches the FCC database
for an open channel for running interferencefree wireless systems.
Fresnel Clearance Zone Calculator By TeraBeam
Fresnel Zone Calculator 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.
Good Calculators
Large collection of calculators for engineering, finance, logistics, loans, budgets,
conversions, sports & health, statistics, mechanics, and other topics.

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 Lots of engineering programs.
Impedance Matching Network Designer John Wetherell, Berkeley,
CA.
Inflation Calculator
U.S., Canadian, and Italian versions. Enter begin and end dates and get equivalent dollar
values, by S. Morgan Friedman.
Inflation Calculator U.S. Bureau of Labor Statistics (BLS).
JPole Antenna
Calculator Enter the operating frequency and calculate antenna dimensions
 online.
Julian Date Calculator
Calculates JDs for a given month.
Link Budget Calculator A towertotower, overtheair
JavaScript calculator, by Wireless Connections.
LOGInterMod
Leslie Green / U.K.  A Windows program (Freeware) that calculates twotone intermodulation
products up to the 30th order.
Martindale's Calculator OnLine Center More than 20,000
calculators  this site has grown incredibly over the years.
MegaConverter2
Multifunctional units converter.
Microwave
Impedance Calculator (MWIJ 1.0) Substrate line impedance calculator by
Rogers Corporation. Written in Java  nice.
Mortgage
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
8 different calculators: Mortgage calculator, Affordability, Early PayOff, Interest
Only, Advanced Mortgage calculator, Mortgage Refinance, Basic Amortization, and Comparison
calculator
N Calculators
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.
Noise Figure <>
Noise Temperature Calculator
Online Conversion
Convert just about anything to just about anything else.
PCB Trace &
Via Calculator 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.
PLL Phase Noise Calculator By Hittite Microwave (now
Analog Devices).
Poles & Zeros Calculator Move the poles and zeros to see
the frequency domain response.
Power Calculator
Motor & line calculations, conversions.
Radio
Calculators Pi attenuators and air inductor java calculators by Jim Hawkins.
Random
Science Tools and Calculators 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
Electronics
Math
Physics
Resistor Color Code Calculator (Reversible) This resistor
color code calculator also provides a table of nearest standard values of resistors for
standard tolerances.
Resistor Ratio
Calculator 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 Calculator Workbook Collection of commonly used calculators
including Attenuators, Bandpass Filters, Cascaded Components, Coils / Inductors, DeltaWye
(Resistors), Directional Couplers, Doppler Shift, Highpass Filters, Lowpass Filters,
Mixer Frequency Conversion, Near / Far Field, Noise FigureTemp, Path Loss, 1Way, Path
Loss, 2Way, Propagation Time, Radar Blind Speed, Radar Horizon / Line of Sight, Rectangular
Cavity, Skin Depth, Smith Chart, VSWRRLGamma, Voltage Divider, Voltages & Power
 Vrms, Vavg, Vpk
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 General purpose engineering calculator by MilMega  includes table
of physical constants, component parameter calculators (capacitance, inductance, resonance,
pads), multiple transmission line calculators.
RF & Analog Tutorials
w/Java Apps Website 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 Cascade Workbook 2018 RF, system, cascade for
Excel spreadsheet.
RF Workbench RF, system, up/downconverter, spurious analysis,
budget  best value out there.
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).
SatelliteRelated
Calculators Sun interference, powertonoise, tilt angle, antenna gain
and more than thirty other calculators.
Satellite Link
Budget Calculator Uplink/downlink calculator, Satellite Signals site.
Signals &
Noise Java applet for exploring random processes.
Smith Chart for Visio
By Kirt Blattenberger.
Sunshine Design Engineering
Services 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
VNA Help  for microwave network analyzers.
Transmission Line Calculator The CircuitCalculator.com
Website Excelbased calculator
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
Ultra Converter
II 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.
Voltage Divider Resistor Calculator 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, Power Converter, Inductance Calculator 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 By Guided Wave Technology.
Waveguide Applets Very nice graphical output and user interface,
with animation.
Web Cool Tools RF & microwave design applets that
use numerical input or sliders for setting parameters.
WRConnect
Waveguide structure design tool.
Corrugated
LowPass Filter Design Workshop
Waveguide &
EM Calculators This is a very nice Java/JavaScriptbased set of calculators
with a great user interface.
Wireline Calculator
WLAN
Link Planning Calculators Many calculators for wireless link planning:
Fresnel zone, diffraction, path loss, link budget, cable loss.
Yagi Java Applet Change frequency, element diameter,
and number of segments.
