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.
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
collection of antenna planning software.
Antenna System Evaluator
of SWR & feedline losses, KD6DKS.
Antenna System Planner
Capacitor Calculation, American Technical Ceramics.
"T" and Pi topologies using online interactive Excel OWA technology. Here is a
Four topologies: "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 design.
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
Allen's Broadcast Engineering Extravaganza
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
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.
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
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
Electromagnetic Field Applets
Very nice graphical output and user interface, with animation.
- Wave propagation
- Field Polarization
- Oblique Incidence
- Oblique Incidence
on Lossy Medium
Dielectric Slab Waveguide
A nice collection of RF calculators.
Coax Impedance Calculator
Noise Figure Calculator
Skin Depth Calculator
- dBm to
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 comma.
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
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 by RF Shop.
Financial & Mortgage Calculators
Over 100 personal finance 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
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 Applet
Sennheiser searches the FCC database for an open channel for running interference-free wireless systems.
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
Enter the operating
frequency and calculate antenna dimensions - online.
Guided Wave Technology
|Guided Wave Technology's Coupling Matrix Synthesis (CMS) tool facilitates synthesis of N+2 coupling matrices
for Chebyshev bandpass filtering functions, with arbitrary finite-position transmission zeroes.
|The CMS tool gives
a fast and accurate
| ● Filter orders up to 12
● Arbitrary placement of transmission zeroes
● Complex transmission zeroes
● Extended parameter plotting options
file (s2p) generation
● Topology matrix definition of filter circuits
graph and marker functions
● Easily re-scalable axes
● Excellent overview - input/output
● Saving and loading of designs
● Fast response
● Intuitive and very user friendly interface
|Guided Wave Technology
is a microwave filter R&D company, specialized in development and production of
passive filter prototypes and series.
Julian Date Calculator
Calculates JDs for
a given month.
Karnaugh Map Calculator
By Russell Sasamori.
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
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
Leslie Green / U.K.
program (Freeware) that calculates two-tone intermodulation products up to the 30th order.
CalculatorUse our look angle calculator to calculate the pointing angles your dish needs in order to receive
a particular satellite.
Calculator On-Line Center
More than 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 tutorials.
Multifunctional units converter.
Free From JFW Industries.
Microwave Impedance Calculator
Substrate line impedance calculator by Rogers Corporation. Written in Java - nice.
Mixer Spur Calculator
By Hittite Microwave.
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 else.
OpAmp Gain Feedback-Input Resistor Calculator
GAIN-STAGE-CALC is a resistor selection tool for op amp
inverting and non-inverting op amp gain stages - with and without compensation for open-loop gain effects. By
Operational Amplifiers: Interactive Design Tools
Simple OpAmp Buffer Error Budget Calculator - from Analog
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
Conductor thickness, ampacity, temperature rise.
PCB Trace Impedance Calculator
calculator for stripline and microstrip, by U. of Missouri-Rolla EMC Lab.
PC Magazine Website
More than 140 free programs and calculators for electrical, civil, mechanical, and other engineering fields.
PDA Calculator Software
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,
Power Dissipation vs. Die Temperature Calculator
By Analog Devices.
By Fairchild Semiconductor.
National's power supply
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
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.
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.
On the 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
RF, system, cascade for Excel spreadsheet.
RF Cascade Workbook 2004
cascade for Excel spreadsheet.
RF Cascade Workbook 2005
RF, system, 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
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. Excel
calculators, 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 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.
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,
Dielectric Slab Waveguide
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,
units, constants, and matrices
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.