AccelWare accelware.com 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.
AlphiMAX P2P Signal Propagation Calculator alphimax.com/ptp/overview 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 qpar.com/capabilities/software/microwaveantennacalcinstructions
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 Qpar Angus.
Antenna Power Tools awapps.commscope.com/downloads Andrew's complete collection of antenna
planning software.
Antenna System Evaluator n6ach.com/calc/antenna.html Evaluate consequences of SWR &
feedline losses, KD6DKS.
Antenna System Planner awapps.commscope.com/downloads/amsp/ By Andrew Corporation.
ATC QuickCalc atceramics.com/designsupport Capacitor Calculation, American Technical
Ceramics.
Attenuator Calculators rfcafe.com/references/spreadsheets/attencalcss.htm "T" and
Pi topologies using online interactive Excel OWA technology. Here is a
JavaScript version.
Attenuator Calculator microwaves101.com/encyclopedia/calcattenuator.cfm Four topologies:
"T", Pi, BridgedT, Reflection.
Attenuator Calculator http://www.phasematrix.net/phasematrix/rfdesigntools/teeapiattenuatorcalculator
Very nicely done online interactive calculator  by Microwaves & RF, Paul Khanna of Phase Matrix
Attenuator Calculator db0smg.afug.unigoettingen.de/~dk1rm/tools/att.html DK1RM Here
is a JavaScript version for Pi and T attenuators  auf Deutsch. Here it is
in English. Other calculators available by clicking on the
Tools link.
Attenuators sandiego.edu/~ekim/e194rfs01/minl_atten/minlosatten.html Minimum loss attenuator
design.
AVX SPIMIC avxcorp.com/SpiApps Capacitor calculation.
Besser Associates besserassociates.com 4159493300 / Los Altos, CA
Reflectometer,
Butterworth Filter Designer,
dBmtodbW, and
Smith Chart applets.
Broadcast Engineer's Calculators by SOB (Sweet Old
Bob) 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 allenk.home.infionline.net/engpgms.html 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.
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
here!
CoilSim Basic ciol inductor calculator
applet, by Nathan Iyer
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.
Cubicle Quad Antenna Calculator
Determine dimensional quantities  javascript.
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
Die Temperature vs. Power Dissipation An interactive calculator for estimating junction temperature from
power dissipation and packaging/heatsink characteristics. By Analog Devices.
DigSim
Digital schematic editor & simulator from Berkeley.
Dirac Delta
"Science and engineering encyclopedia." Hundreds of JavaScript calculators, definitions, historical information,
etc.
eCalc 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
Electric
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
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.
Field
Strength Calculator V/m, dBuV/m, dBuA/m, pT, dBpT, Tesla, Guass, A/m, mW/cm^2 & W/m^2. From Compliance
Engineering.
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 by 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
Other calculators for  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.
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.
JPole Antenna Calculator Enter the
operating frequency and calculate antenna dimensions  online.

Julian Date Calculator 1728.com/calendar.htm Calculates JDs for a given month.
Karnaugh Minimizer karnaugh.shuriksoft.com 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 wwwusers.cs.york.ac.uk/~fisher/lcfilter This 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 wirelessconnections.net/calcs/BudgetCalc.asp A towertotower,
overtheair JavaScript calculator, by Wireless Connections.
LOGInterMod logbook.freeserve.co.uk Leslie Green / U.K. A Windows program (Freeware)
that calculates twotone intermodulation products up to the 30th order.
Look Angle Calculator intelsat.com/resources/satellitedatapas/calclookangle.asp Use
our look angle calculator to calculate the pointing angles your dish needs in order to receive a particular satellite.
Martindale's Calculator OnLine Center martindalecenter.com/Calculators.html More than
20,000 calculators  this site has grown incredibly over the years.
Math eBook mathebook.net 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.
MegaConverter2 megaconverter.com/mega2 Multifunctional units converter.
Microwave Calculator jfwindustries.com/RF_Conv_Sign_up.htm Free From JFW Industries.
Microwave Impedance Calculator (MWIJ 1.0) rogerscorp.com/acm/technology Substrate line
impedance calculator by Rogers Corporation. Written in Java  nice.
Mixer Spur Calculator hittite.com/tools/Spurcalc/SpurCalc25JarLockE.htm By Hittite
Microwave.
Mortgage Calculators mortgagecalculator.org/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 mortgagecalculator.net 8 different calculators: Mortgage calculator,
Affordability, Early PayOff, Interest Only, Advanced Mortgage calculator, Mortgage Refinance, Basic Amortization,
and Comparison calculator
N Calculators ncalculators.com/electronics 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.
Online Conversion onlineconversion.com Convert just about anything to just about anything
else.
PCB Trace & Via Calculator skottanselektronik.com 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.
PCB Trace Width geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm Conductor thickness,
ampacity, temperature rise.
PCB Trace Impedance Calculator emclab.mst.edu/pcbtlc2 Online interactive calculator
for stripline and microstrip, by U. of MissouriRolla EMC Lab.
PDA Calculator Software adacs.com/menu/PDAcalc_matrix.php ADACS has a nice collection
of software for engineering, scientific and financial applications.
PLL Phase Noise Calculator hittite.com/tools/PLLCalc/PLLCalc.htm By Hittite Microwave.
Poles & Zeros Calculator thole.org/manfred/polezero/en_idx.html Move the poles
and zeros to see the frequency domain response.
Power Calculator macgen.com/calcul.html Motor & line calculations, conversions.
Power Dissipation vs. Die Temperature Calculator analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/powertemp/powertemp.html
By Analog Devices.
Power Switch
Designer By Fairchild Semiconductor.
Power Supply National's power supply
design tool.
Power & Voltage Converter
Convert between units of dBm, dBW, watts, dBV, volts.
Radiated Power
Calculator ERP, EIRP, dBuV/m, dBm & mW. From Compliance Engineering.
Radiated Power
Converter Online converter by Compliance Engineering. EIRP (mW) to ERP (mW) to dBuV/m @ 3m to dBuV/m
@ 10m.
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 Finds R1/R2 combinations using standard resistor values, by Bennet Blake.
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 Calculator
Wavelength, dBm, dBuV, W, dBuV/m, mW/cm^2, pJ/cm^2, V & VSWR. From Compliance Engineering.
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 Calculators On the
Federal Communications Commission website.
RF Calculators
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 & P1 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 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.
RLC Tuned Circuit Calculator Enter
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.
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).
RW Calc Software Free from RadioWaves, several RF utilities, such as converters, farfield calculation,
Fresnel zone clearance and free space propagation.
Sage Notebook Spreadsheets for many realms of science
and engineering. All are free downloads
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.
SNR / THD / SINAD Calculator By Analog Devices.
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.
Toroid Calculator
Uses standard cores; e.g., T50.
Tower Planner
Andrew's handy calculator for height, wind speed, terrain, etc.
Transmission
Line Calculator The CircuitCalculator.com Website Excelbased calculator
Transmission Line Calculator
By Kevin Schmit, W9CF.
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.
Units Converter: VRMS / dBm / dBu / dBV A utility to convert between standard units of power measurement
and signal strength  from Analog Devices
Vertex 42
Engineering calculators & converter applets & spreadsheets.
Excel templates,
financial calculators,
and calendars. We also host
The Excel Nexus  The ultimate directory of
3rdparty Microsoft Excel® resources, including addins, templates, tutorials, and consulting services.
Virtual Slide Rules
Standard slide rule
 EngCom.net Pickett
slide rule  Antiquark.com
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 Calculator Animated
version from BesserNet.
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. 
Parallel
Plate Waveguide 
Rectangular Waveguide
 Dielectric
Slab Waveguide
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
WiseCalc WiseCalc is the complete mathematical text
engine calculator for your computer.  it's FREE!  it has a multiline texteditor type of interface
 it has 450+ unit conversions builtin  it has hundreds of functions builtin  it can save and
open calculation pages  it can evaluate builtin 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
loss.
Yagi Java Applet Change frequency, element diameter, and number of segments.
