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 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 2003 RF, system, cascade for Excel spreadsheet.
RF Cascade
Workbook 2004 RF, system, cascade for Excel spreadsheet.
RF Cascade
Workbook 2005 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.
