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.
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.
Antenna Design Calculator
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 Q-par Angus.
Antenna Power Tools
Andrew's complete collection of antenna
Antenna System Evaluator
Evaluate consequences of SWR &
feedline losses, KD6DKS.
Antenna System Planner
By Andrew Corporation.
Capacitor Calculation, American Technical
Pi topologies using online interactive Excel OWA technology. Here is a
"T", Pi, Bridged-T, Reflection.
Very nicely done online interactive calculator - by Microwaves & RF, Paul Khanna of Phase Matrix
in English. Other calculators available by clicking on the
Minimum loss attenuator
415-949-3300 / Los Altos, CA
Butterworth Filter Designer,
Smith Chart applets.
Broadcast Engineer's Calculators
by SOB (Sweet Old
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
Broadcast Engineering Extravaganza
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
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 standard cores.
Chris Gillings' Cardboard Slide Rule Collection
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
Basic ciol inductor calculator
applet, by Nathan Iyer
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.
Huge collection of converters and calculators.
Cubicle Quad Antenna Calculator
Daycounter, Inc. Engineering Services
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.
of Water (Complex)
Calculates the real and imaginary parts of the dielectric constant for water, sung temperature,
salinity, and frequency. By Gareth Harris
Die Temperature vs. Power Dissipation
An interactive calculator for estimating junction temperature from
power dissipation and packaging/heatsink characteristics. By Analog Devices.
Digital schematic editor & simulator from Berkeley.
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.
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
Very nice graphical output and user interface, with animation.
- Field Polarization
- Oblique Incidence
- Oblique Incidence
on Lossy Medium
A nice collection
of RF calculators.
- Microstrip Impedance
Noise Figure Calculator
Skin Depth Calculator
- Wavelength Calculator
- dBm to Watt Calculator
- Watt to dBm Calculator
Field Units Converter
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
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
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.
V/m, dBuV/m, dBuA/m, pT, dBpT, Tesla, Guass, A/m, mW/cm^2 & W/m^2. From Compliance
Filter Coupling Matrix Calculator
of N+2 coupling matrices for Chebyshev bandpass filtering functions, with arbitrary finite-position transmission
Filter Design Spreadsheets
Waveguide Filter Designer ,
Combline and Interdigital Filter Design
Spreadsheet by RF Shop.
Financial & Mortgage Calculators
Over 100 personal finance calculators.
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
Other calculators for
- Fresnel Clearance
Distance between two points using
- Latitudes and Longitudes
performance of flex circuits by Rogers Corporation.
Frequency Finder - Open TV Channel
Sennheiser searches the FCC database for an open channel for running interference-free wireless
Fresnel Clearance Zone
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.
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
of engineering programs.
Impedance Matching Network Designer
John Wetherell, Berkeley, CA.
U.S., Canadian, and
Italian versions. Enter begin and end dates and get equivalent dollar values,
by S. Morgan Friedman.
J-Pole Antenna Calculator
operating frequency and calculate antenna dimensions - online.
Julian Date Calculator
Calculates JDs for a given month.
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
This is an interactive design
package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs). From University
Link Budget Calculator
Leslie Green / U.K.
A Windows program (Freeware)
that calculates two-tone intermodulation products up to the 30th order.
Look Angle Calculator
our look angle calculator to calculate the pointing angles your dish needs in order to receive a particular satellite.
Martindale's Calculator On-Line Center
20,000 calculators - this site has grown incredibly over the years.
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
Multifunctional units converter.
Free From JFW Industries.
Microwave Impedance Calculator (MWIJ 1.0)
impedance calculator by Rogers Corporation. Written in Java - nice.
Mixer Spur Calculator
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 Comparison calculator
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.
Convert just about anything to just about anything
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.
PCB Trace Width
ampacity, temperature rise.
PCB Trace Impedance Calculator
Online interactive calculator
for stripline and microstrip, by U. of Missouri-Rolla EMC Lab.
PDA Calculator Software
ADACS has a nice collection
of software for engineering, scientific and financial applications.
PLL Phase Noise Calculator
By Hittite Microwave.
Poles & Zeros Calculator
Move the poles
and zeros to see the frequency domain response.
Motor & line calculations, conversions.
Power Dissipation vs. Die Temperature Calculator
By Analog Devices.
By Fairchild Semiconductor.
National's power supply
Power & Voltage Converter
Convert between units of dBm, dBW, watts, dBV, volts.
ERP, EIRP, dBuV/m, dBm & mW. From Compliance Engineering.
Online converter by Compliance Engineering.
EIRP (mW) to ERP (mW) to dBuV/m @ 3m to dBuV/m
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.
Resistor Color Code Calculator
This resistor color code calculator also provides a table of nearest standard values of resistors
for standard tolerances.
Finds R1/R2 combinations using standard resistor values, by Bennet Blake.
Resistor Ratio Calculator
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 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.
General purpose engineering
calculator by MilMega - includes table of physical constants, component parameter calculators (capacitance, inductance,
resonance, pads), multiple transmission line calculators.
Wavelength, dBm, dBuV, W, dBuV/m, mW/cm^2, pJ/cm^2, V & VSWR. From Compliance Engineering.
RF & Analog Tutorials w/Java Apps Website
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.
Federal Communications Commission website.
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 & P-1 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
cascade for Excel spreadsheet.
RF Cascade Workbook 2004
cascade for Excel spreadsheet.
RF Cascade Workbook 2005
cascade for Excel spreadsheet.
RF, system, up/downconverter,
spurious analysis, budget - best value out there.
RLC Tuned Circuit Calculator
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.
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
Free from RadioWaves, several RF utilities, such as converters, far-field calculation,
Fresnel zone clearance and free space propagation.
Spreadsheets for many realms of science
and engineering. All are free downloads
interference, power-to-noise, tilt angle, antenna gain and more than thirty other calculators.
Satellite Link Budget Calculator
calculator, Satellite Signals site.
Signals & Noise
for exploring random processes.
By Kirt Blattenberger.
SNR / THD / SINAD Calculator
By Analog Devices.
Sunshine Design Engineering Services
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 analyzers.
Uses standard cores; e.g., T-50.
Andrew's handy calculator for height, wind speed, terrain, etc.
The CircuitCalculator.com Website
Transmission Line Calculator
By Kevin Schmit, W9CF.
TRL / LRL Calculator
TRL (Through, Reflect, Line) and LRL (Line, Reflect, Line) reference plane calculators provided by Electro-Photonics.
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.
Units Converter: VRMS / dBm / dBu / dBV
A utility to convert between standard units of power measurement
and signal strength - from Analog Devices
Engineering calculators & converter applets & spreadsheets.
and calendars. We also host
The Excel Nexus - The ultimate directory of
3rd-party Microsoft Excel® resources, including add-ins, templates, tutorials, and consulting services.
Virtual Slide Rules
Standard slide rule
slide rule - Antiquark.com
Voltage Divider Resistor
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.
version from BesserNet.
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
By Guided Wave Technology.
Very nice graphical output and user interface,
Web Cool Tools
microwave design applets that use numerical input or sliders for setting parameters.
design tool. Corrugated Low-Pass Filter Design
Waveguide & EM Calculators
WiseCalc is the complete mathematical text
engine calculator for your computer.
- it's FREE!
- it has a multi-line text-editor type of interface
- it has 450+ unit conversions built-in
- it has hundreds of functions built-in
- it can save and
open calculation pages
- it can evaluate built-in and user definable functions,
WLAN Link Planning Calculators
Many calculators for wireless link planning: Fresnel zone, diffraction, path loss, link budget, cable
Yagi Java Applet
Change frequency, element diameter, and number of segments.