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AccelWare
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.
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
Tech-Select
Capacitor Calculation, American Technical Ceramics.
Attenuator
Calculators
"T" and Pi topologies using online interactive Excel OWA
technology.
Attenuator Calculator
Four topologies: "T",
Pi, Bridged-T, Reflection.
Attenuator Calculator
DK1RM
Here is a JavaScript version
for Pi and T attenuators - auf Deutsch.
Attenuators
Minimum loss attenuator design.
Besser Associates
415-949-3300 / 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 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.
ConvertIt
Huge collection of converters and calculators.
Daycounter,
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
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.
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Wave Propagation
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Field Polarization
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Oblique
Incidence
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Oblique Incidence on Lossy Medium
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Parallel Plate Waveguide
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Rectangular Waveguide
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Dielectric Slab Waveguide
everything
RF
A nice collection of RF calculators.
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Attenuator Calculator
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Microstrip Impedance Calculator
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Coax Impedance Calculator
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Cascaded Noise Figure Calculator
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Skin Depth Calculator
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Wavelength Calculator
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dBm
to Watt Calculator
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Watt
to dBm Calculator
Excalibur RPN Calculator Applet
Excalibur 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 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 finite-position 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.
Free-Space
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 interference-free 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 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.
Good Calculators
Large collection of calculators for engineering, finance, logistics, loans, budgets,
conversions, sports & health, statistics, mechanics, and other topics.
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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).
J-Pole Antenna
Calculator
Enter the operating frequency and calculate antenna dimensions
- online.
Julian Date Calculator
Calculates JDs for a given month.
Link Budget Calculator
A tower-to-tower, over-the-air
JavaScript calculator, by Wireless Connections.
LOGInterMod
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.
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 Pay-Off, 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; current-carrying 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 non-inverting).
Freeware.
RF Cafe Calculator Workbook
Collection of 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 Calculators
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.
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, cross-talk, 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).
Satellite-Related
Calculators
Sun interference, power-to-noise, 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
Excel-based calculator
TRL / LRL Calculator
TRL (Through, Reflect, Line) and
LRL (Line, Reflect, Line) reference plane calculators provided by Electro-Photonics.
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 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.
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.
WR-Connect
Waveguide structure design tool.
Corrugated
Low-Pass Filter Design Workshop
Waveguide &
EM Calculators
This is a very nice Java/JavaScript-based 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.
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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.
