These calculators are offered free of charge
- some by vendors and others by individuals. Some are stand-alone 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 and vintage
Cardboard Slide Rule Calculators.
A good way to find on this page what you need is do
a browser page search.
Unit Conversion Tool - powerful, intuitive, and easy-to-use 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.
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.
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
Analog Devices Calculators
Big list of online calculators
Antenna System Evaluator
Evaluate consequences of
SWR & feedline losses, KD6DKS.
Capacitor Calculation, American Technical
"T" and Pi topologies using online interactive Excel
topologies: "T", Pi, Bridged-T, Reflection.
Minimum loss attenuator
415-949-3300 / Los Altos, CA
Broadcast Engineering Related Calculators
Allen's Broadcast Engineering Extravaganza
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.
By webMathematica, scores of online interactive calculators for algebra, trigonometry,
calculus, matricies, linear equations.
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.
Capacitor calculation, by Dielectric Laboratories.
+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.
Boyle's Law, Charles' Law, STP, molar volume, etc, by 1728 Software Systems.
Inductor values using
Coordinate System Converter
between rectangular, polar, spherical, and cylindrical coordinates.
Connect802 Antenna System Designer
An on-line calculator that creates
a wireless network antenna system design report based on various parameters that
you provide. It will help you predict end-to-end performance and evaluate your network
design when you plan a point-to-point, or point-to-multipoint outdoor wireless network
deployment. You'll be able to analyze the radio link and tune network parameters
for optimal link suitability.
Huge collection of converters and calculators.
Inc. Engineering Services
Calculators for switching power supply,
air core inductors, Sallen-Key LP Butterworth filter, L matching network, standard
resistor value, PI & T pad attenuator, reactance, series - parallel impedance
conversion, Z-S-Y 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
"Science and engineering
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.
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
EIA Tube Bases for Visio
Electromagnetic Field Applets
Very nice graphical output
and user interface, with animation.
Oblique Incidence on Lossy Medium
Parallel Plate Waveguide
Dielectric Slab Waveguide
A nice collection of RF calculators.
Microstrip Impedance Calculator
Coax Impedance Calculator
Cascaded Noise Figure Calculator
Skin Depth Calculator
dBm to Watt Calculator
to dBm Calculator
Excalibur RPN Calculator Applet
does not use more conventional "algebraic" notation like many low-end calculators
on the market. Instead it uses the high-powered parenthesis-free RPN notation (Reverse
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
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
Facilitates synthesis of N+2 coupling matrices for Chebyshev
bandpass filtering functions, with arbitrary finite-position transmission zeroes.
Filter Design Spreadsheets
and Interdigital Filter Design Spreadsheet
Over 100 personal finance calculators.
Loan amortization, interest, loan payment by 1728 Software Systems.
FM Antenna Calculator
by ERI (Electronics
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.
Free-Space Loss Calculator
two points using Latitudes and Longitudes
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 interference-free wireless systems.
Fresnel Clearance Zone Calculator
Fresnel Zone Calculator
will generate the radius of the first Fresnel zone only (at the obstacle point or
the mid-point), the 60% (no obstacle) radius and the height of the earth curvature
at the mid-point of the Total link distance. By Wireless Connections.
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.
Huge collection of online calculators for tax,
finance, math, engineering, mortgages, logistics, loans, budgets, conversions, sports &
health, statistics, mechanics, and other topics.
Impedance Matching Network Designer
John Wetherell, Berkeley, CA.
U.S., Canadian, and Italian versions. Enter begin and end dates and get equivalent
by S. Morgan Friedman.
U.S. Bureau of Labor Statistics (BLS).
J-Pole Antenna Calculator
Enter the operating frequency
and calculate antenna dimensions - online.
Calculates JDs for a given month.
Link Budget Calculator
Leslie Green / U.K. - A Windows program (Freeware) that calculates two-tone intermodulation
products up to the 30th order.
Martindale's Calculator On-Line Center
More than 20,000 calculators - this site has grown incredibly over the years.
Multifunctional units converter.
Impedance Calculator (MWIJ 1.0)
Substrate line impedance calculator
by Rogers Corporation. Written in Java - nice.
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.
8 different calculators: Mortgage calculator, Affordability, Early Pay-Off, Interest
Only, Advanced Mortgage calculator, Mortgage Refinance, Basic Amortization, and
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
Convert just about anything to just about anything else.
PCB Trace &
A very complete set of online calculators for microstrip,
embedded, and differential microstrip impedance; stripline and differential stripline
impedance; stripline and microstrip crosstalk; current-carrying capacity of traces
and thermal vias; heat dissipation of thermal vias. By Sören Nilsson.
PLL Phase Noise Calculator
Microwave (now Analog Devices).
Poles & Zeros Calculator
Move the poles
and zeros to see the frequency domain response.
Motor & line calculations,
Pi attenuators and air inductor java calculators by
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.
Resistor Color Code Calculator (Reversible)
This resistor color code calculator also provides a table of nearest standard values
of resistors for standard tolerances.
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 non-inverting). Freeware.
RF Cafe Calculator Workbook
commonly used calculators including Attenuators, Bandpass Filters, Cascaded Components,
Coils / Inductors, Delta-Wye (Resistors), Directional Couplers, Doppler Shift, Highpass
Filters, Lowpass Filters, Mixer Frequency Conversion, Near / Far Field, Noise Figure|Temp,
Path Loss, 1-Way, Path Loss, 2-Way, Propagation Time, Radar Blind Speed, Radar Horizon
/ Line of Sight, Rectangular Cavity, Skin Depth, Smith Chart, VSWR|RL|Gamma, Voltage
Divider, Voltages & Power - Vrms, Vavg, Vpk
RF Cafe Online
Many online calculators for noise figure/temperature,
filter responses, voltage dividers, waveguide cutoff frequency, VSWR-return loss-reflection
coefficient conversions and more, by Kirt Blattenberger.
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, cross-talk, much more. By Amanogawa.
RF Cascade Workbook 2018
RF, system, cascade
for Excel spreadsheet.
RF, system, up/downconverter, spurious analysis,
budget - best value out there.
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).
Sun interference, power-to-noise, tilt angle, antenna
gain and more than thirty other calculators.
Link Budget Calculator
Uplink/downlink calculator, Satellite Signals
Java applet for exploring random processes.
Smith Chart for Visio
By Kirt Blattenberger.
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.
VNA Help - for microwave network
Transmission Line Calculator
TRL / LRL Calculator
Reflect, Line) and LRL (Line, Reflect, Line) reference plane calculators provided
Transmission Line Calculator by Applied Wave Research. This file seems to be no
longer available on the AWR website.
If these to converters don't have it, you don't need to convert
it! by 1728 Software.
This is a very extensive measurement value and units
converter for length, weight, height, area, temperature, time, pressure, speed,
force, etc. Each and every converter has a detailed explanation with an example.
Vertex 42 -
Engineering calculators & converter applets & spreadsheets.
Voltage Divider Resistor Calculator
Table of two-resistor voltage dividers using standard 5% tolerance resistor. Opamp
feedback-input 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
972-3-6175082 / Israel
Free downloadable VSWR, power converter, inductance calculator,
written by Dr. Ronen Holtzman for Elisra Microwave Division engineers.
Dimension and Electrical Response Calculator
By Guided Wave Technology.
Very nice graphical output and user interface,
Web Cool Tools
RF & microwave
design applets that use numerical input or sliders for setting parameters.
Waveguide structure design tool.
Low-Pass Filter Design Workshop
Waveguide & EM Calculators
This is a very nice
WLAN Link Planning Calculators
calculators for wireless link planning: Fresnel zone, diffraction, path loss, link
budget, cable loss.
Yagi Java Applet
element diameter, and number of segments.