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You can use these calculators to calculate attenuator loss and impedance, resistor divider network, bias voltage, battery life, and more..

Attenuator calculators – PI and T | SiversIMA
Enter values for R1 and R2 to calculate attenuator loss and impedance. Alternatively, Generate R1 and R2 for a wanted attenuation.

AWG to Diameter (inch) Calculator
The formula converts American Wire Gauge to Diameter and Vice versa.

Adjustable Voltage Regulator Resistor Divider Calculator
This calculator computes the resistor divider network for most adjustable voltage regulators whether they are linear or switching.

Air Core Inductor Coil Inductance Calculator
The following is a design tool which calculates the inductance of an air core inductor.

Attenuator calculators – PI and T | SiversIMA
Enter values for R1 and R2 to calculate attenuator loss and impedance. Alternatively, Generate R1 and R2 for a wanted attenuation.

BJT Cascode Amplifier Calculator
This calculator computes bias voltage and current levels, as well as gain and frequency response for the Cascode amplifier.

BJT Transistor as a Switch, Saturation Calculator
A BJT transistor can be used as an electronic switch when it is driven into saturation, or alternatively driven to the cut off region. Calculating the base resistor is a common engineering task, which this calculator automates.

Bandpass Filter Designers – Butterworth and Chebyshev | SiversIMA
Calculate the L & C values needed for Pi and T topologies.

Bandstop Filter Designers – Butterworth and Chebyshev | SiversIMA
Calculate the L & C values needed for Pi and T topologies. Enter the center, -3dB bandwidth and system impedance.

Battery Life Calculator
Calculate how many hours a battery will live.

Battery Life Calculator from Watt Hour
The calculator will calculate the battery life if the Watt Hour and the battery voltage is known.

Battery life Calculator
This online calculator gives you a ballpark figure of the life of a battery.

Bramham Matching Transformer | SiversIMA
This will calculate the exact (approx. 12th wave) wavelengths for a Bramham impedance matching transformer.

Calculate x power y
This calculator calculates x power y according to the following formula z = xy

Calculator for a.c. Resistance of a Round Straight Wire
Calculates the a.c. resistance of a round straight wire for common conducting materials.

Calculator for capacitance of a rectangular capacitor, including edge effect.
For a rectangular parallel plate capacitor with edge effect, showing the formula used.

Calculator for skin effect depth
Calculates the effective skin depth (1/ε) for common conducting.

Calculator for the Inductance of a Flat Wire
For a flat wire, ribbon or PCB track showing the formula used.

Calculator for total capacitance of a circular capacitor, including edge effect
Finds the total capacitance of a circular parallel plate capacitor from radius, εr and thickness.

Capacitor Coupled Resonator Designer – Butterworth and Chebyshev | SiversIMA
Calculate the C values needed for a capacitor-coupled-resonator BFP.

Capacitor Energy and Time Constant Calculator
This calculator computes the energy in a capacitor, given the voltage across it. If you specify a load resistor it will also compute the time constant, or the time until the voltage drops to 37%, or charges to 63%.

Capacitor Inductor and Resistor in Parallel Calculator
Calculates the complex impedance (Z) (real and imaginary) of a capacitor, inductor and a resistor in parallel at a particular frequency.

Capacitor and Inductor in Parallel Calculator
Calculates the total reactance (XT) of a capacitor and a inductor in parallel at a particular frequency.

Capacitor and Inductor in Series Calculator
Calculates the total reactance (XT) of a capacitor and a inductor in series at a particular frequency.

Capacitor and Resistor in Parallel Calculator
Calculates the complex impedance (Z) (real and imaginary, or resistance and reactance) of a capacitor and a resistor in parallel at a particular frequency.

Characteristic Impedance Calculator
Calculates Delay, Velocity Factor, Effective Dielectric Constant and Characteristic Impedance of a PCB track. This calculator can also be used for measuring coaxial cable.

Chip Resistor De-rating Calculator | SiversIMA
The calculator will return the maximum current allowable with its corresponding available volt drop.

Coax Impedance Calculator | SiversIMA
Calculate the impedance of a coaxial transmission line.

Coil Physical Properties Calculator
This calculator estimates the physical properties of a coil such as resistance, total length of wire needed and number of windings, give the wire diameter, and bobbin length.

Comparator Hystereses Calculator
This calculator will compute the resistor ratio R1/R2 and reference voltage for given high and low threshold values for a hystereses curve, or the threshold values given the reference voltage and resistor ratio.

Complete RF Amplifier Design and Analysis Calculator
Given a amplifier or transistor's the S-parameters (scattering parameters), this calculator will analyze its stability, maximum gain, an even suggest a suitable conjugate L-matching network for a given load and source impedance of the circuit to which the amplifier will be connected.

Coplanar Waveguide With Ground Calculator
The characteristic impedance (Zo) of coplanar waveguide with ground or microstrip lines with signal side ground plane can be calculated using the active calculator.

Decibel Calculator
This calculator converts between decibels, voltage gain (or current), and power gain.

Elliptical Integrals of the First Kind Calculator
This calculator finds the elliptical integral K(k) and shows each successive step until the final result is obtained.

Feed Rate Calculator
When milling or drilling, or creating a tool path for a CNC machine the feed rate must be determined. Given the diameter of the tool and the surface speed, the RPMs of the spindle can be calculated. Then if the tooth load for the cutter is known, and the number of teeth, the feed rate can be determined.

Filter Designers – Butterworth and Chebyshev | SiversIMA
Calculate the L & C values needed for Pi and T topologies.

Flyback Switch Mode Regulator Calculator
In this design calculator we assume that we have an appropriate transformer, and then figure out the other appropriate parameters for designing the rest of the circuit.

Flyback Transformer Design and Calculator
The calculator below calculates the number of turns, the inductance, and the wire gauge for the various windings of a discontinuous mode fly-back converter.

Free Space Path Loss Calculator | SiversIMA
Calculate the loss for a given distance at an RF frequency.

Friis Path Loss Calculator
This calculator computes the power that a receiving antenna receives for a given transmitting antenna for a given power for a distance greater than one wavelength for line of sight transmission.

G-Code Tool Path Generator for Circles
This calculator will generate a G-Code tool path for a circle.

G-Code Tool Path Generator for Drilling Holes
This calculator will generate a G-Code tool path for drilling multiple holes.

G-Code Tool Path Generator for Milling Inner Rectangles
This calculator will generate a G-Code tool path for a rectangle. If the style selected is fill, it will mill out the center with multiple zig-zag passes. This can be used to plane a surface if the rectangle is slightly larger than the surface to be planed.

G-Code Tool Path Generator for Milling a Series of Points
This calculator will generate a G-Code tool path for a series of points, with incremental depth increases. This can be used to plane a surface if the rectangle is slightly larger than the surface to be planed.

G-Code Tool Path Generator for Planing Stock with a Fly Cutter
This calculator will generate a G-Code tool path for planing stock with a fly cutter.

G-Code Tool Path Generator for for Trimming Stock With End Mill
This calculator will generate a G-Code tool path for trimming stock with an end mill.

Geometric Scaling of a Triangle
To use this calculator enter 3 adjacent points from a polygon, and the center point will be the projected point of the new polygon. This also calculates the segment lengths and angles of the original triangle.

Graphical Resistance Calculator
Calculate Resistor Values from Color Codes.

Heat Sink Temperature Calculator
This calculator and tutorial computes the junction temperature of a power electronics device given the maximum ambient temperature, and the heat sink thermal resistance. The calculator will let you know if the maximum junction temperature could be exceeded for a given power, and likewise will tell you the maximum power that the device can handle for a given maximum power.

Highpass Filter Designers – Butterworth and Chebyshev | SiversIMA
Calculate the L & C values needed for Pi and T topologies.

How to wire an LED, Tutorial and Calculator
This tutorial article describes how to use LEDs in electronics circuits, and how to calculate the current limiting resistor, and relates other useful hints on using LEDs.

Impedance Calculator – Microstrip and Stripline | SiversIMA
Calculate Microstrip impedance for given PCB parameters.

Inductance Calculator for parallel Wire
Calculate the inductance of parallel wire (Power and Ground System).

Inductor Current and Maximum Power Calculator
What is the maximum pulse on time that you should use? How much power is being transferred to the coil?

Inductor Stored Energy Calculator
Inductors store energy in the form of a flowing current. The energy is related to the current magnitude of the current. If you add up the energy for each charging cycle over 1 second this will give you the power.

Inverting Op-Amp Resistor Calculator
This calculator determines the bias and feedback resistors for an op-amp, given the gain and desired output bias point.

JFET Buffer Bias Calculator
A JFET buffer (Common Drain Amplifier) is useful in that it has extremely high input resistance as compared to a BJT buffer. The input resistance is equal to RG, which is typically very large, on the order of 1M ohm.

L Matching Network Calculator
The following is a design tool which calculates the values for an L matching network.

LC Balun Designer | SiversIMA
Enter the frequency of operation and the balanced and unbalanced Z0. Values for L and C will be calculated.

LC Impedance Matching Network Designer | SiversIMA
Enter the input and output impedances to be matched and the centre frequency. Values for L and C will be calculated for the four topologies shown.

LC Resonance Calculator
Enter in any two parameters for a resonant circuit, and this calculator will calculate the third missing parameter.

LC Resonance Calculator | SiversIMA
Calculate the resonant frequency of an LC tuned circuit.

Line Segment Angle Calculator
This calculator converts between polar and rectangular coordinates.

Lowpass Filter Designer – Butterworth and Chebyshev | SiversIMA
Calculate the L & C values needed for Pi and T topologies.

Lumped 2-way Wilkinson Splitter Designer | SiversIMA
Enter the frequency of operation and system Z0. Values for L, C1 and C2 and R will be calculated.

Lumped Quadrature Coupler Designer | SiversIMA
Enter the frequency of operation and system Z0. Values for L1, L2 and C will be calculated.

MSP430 UART Register Calculator
This calculator computes the value of the various UART registers for the MSP430 series processors from Texas Instruments.

Matching Pi Attenuator Calculator
Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, VSWR and return loss of a matching Pi attenuator.

Matching T Attenuator Calculator
Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, VSWR and return loss of an impedance matching T attenuator.

Maximum Field Strength Calculator
This calculator calculates the maximum field strength that a dipole antenna could produce at 3M assuming 100% antenna efficiency. This gives you an upper bound for transmitter power.

Maximum Flux Density Calculator
The maximum flux density for a core/coil geometry should be calculated to verify that it is below the specified value for a given core, so that the core doesn't saturate. This calculator is useful in matching a core size to the required power.

Microstrip Inductor Calculator
This calculator computes the inductance of a microstrip etched on a PCB.

Microstrip Transmission Line Characteristic Impedance Calculator Using a Formula by Brian C Wadell
The characteristic impedance (Zo) of a microstrip transmission line can be calculated using the active calculator.

Microstrip Transmission Line Impedance Calculator Using The IPC-2141 Formula
The characteristic impedance (Zo) of a microstrip transmission line can be calculated using the active calculator.

Microstrip Transmission Line Impedance Calculator for PCB's
The characteristic impedance (Zo) of a microstrip transmission line can be calculated using the active calculator.

Mils to cm Calculator
PCB Designers often need to work on metric as well as mils and inches. The formula and calculator convert cm to mils and Vice versa.

Mils to micrometer | Mils to Microns | conversion Calculator
PCB Designers often need to work on metric as well as mils and inches. The formula and calculator convert micrometer to mils and Vice versa.

Mils to mm Calculator
The formula and calculator convert mm to mils and Vice versa.

Mixer Spur Calculator | SiversIMA
Calculate a list of mixer spurious responses for a set frequency plan.

NE555 Astable Multivibrator Frequency and Duty Cycle Calculator
This calculator computes the resistors and capacitors for a NE555 timer chip, which has been configured as a astable multivibrator (oscillator), or square wave generator.

Non-Inverting Op-Amp Resistor Calculator
This calculator determines the bias and feedback resistors for a non-inverting op-amp, given the gain and desired output bias point.

Op-Amp Voltage and Gain Calculator
This calculator determines the output voltage and gain for an op-amp, given it's resistor values, and DC input values.

PCB Trace Calculator | Advanced Circuits
This Javascript web calculator calculates the trace width for printed circuit board conductors for a given current using formulas from IPC-2221 (formerly IPC-D-275).
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PCB Trace Resistance Calculator
The PCB Trace resistance is directly proportional to the length of the wire and inversly proportional to the area of the cross section of the wire. It also increases with the increase in temperature.

PCB Trace Width Calculator
The Calculator calculates the required PCB trace width for a given current.

PI and T Pad Attenuator Calculator
This calculates a resistive PI and T attenuator networks (PADs), for a given attenuation, and characteristic impedance.

PLL Loop Filter Calculator | SiversIMA
This tool will calculate the component values for a 3rd order loop filter.

PLL PFD Frequency Calculator | SiversIMA
Calculates the Greatest Common Divisor for the reference and VCO frequencies, to use as the comparison frequency.

Parallel Plate Capacitor Capacitance Calculator
This calculator computes the capacitance between two parallel plates.

Parallel Resistance Calculator
This calculator will compute the parallel equivalent resistance for up to 6 parallel resistors.

Parallel Resistor Combination Calculator
This calculator allows you to enter in resistance values that you have available, and to calculate all of the parallel combinations of any two of them instantly.

Phase Noise to Jitter Converter | SiversIMA
Calculates RMS jitter from a piecewise linear integration of Single Sideband phase noise.

Pi Attenuator calculator
Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator.

Pi Attenuator calculator with results for resistance, attenuation, return loss, VSWR and reflection coefficient
Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a Pi attenuator.

Polar - Rectangular Coordinate Conversion Calculator
This calculator converts between polar and rectangular coordinates.

Potential Divider Calculator | SiversIMA
Enter values for R1, R2 and Vin to calculate divided Voltage. Alternatively, Generate R1 and R2 for a wanted voltage.

Pulley Speed Calculator
This calculator computes the best pulleys slots to use a desired RPM.

Quarter Wavelength Transformer Calculator
This calculator computes the characteristic impedance of the transmission which matches two impedances.

RF Transmission Line Loss Calculator
This calculator computes the matched line loss for a transmission line using a model calibrated from data for the transmission line types built in to the calculator. It also gives an estimate of the mismatched loss if the mismatch is specified.

RF Trap With Attenuator calculator with results for attenuation, return loss, VSWR and reflection coefficient
Calculates the attenuation, 'impedance', reflection coefficient, VSWR and return loss of a circuit that incorporates a RF tank circuit into a Pi attenuator.

RMS Calculator
RMS is a tool which allows us to use the DC power equations, namely: P=IV=I*I/R, with AC waveforms, and still have everything work out.

Reactance Calculator
Calculate the reactance of an inductor or capacitor for a given frequency.

Reflection Coefficient to Impedance Converter | SiversIMA
Convert a reflection coefficient in Magnitude Angle format into Impedance.

Relative Dielectric Constant Calculator
Based on a formula by Kirchhoff for a circular capacitor, showing the equations used.

Return loss and mismatch loss Calculator
Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load.

Round Wire Inductance Calculator
Calculates the Inductance of a single round wire of common conducting materials.

Round Wire Resistance Calculator
Calculates the d.c. Resistance of a single round wire of common conducting materials.

Satellite dish look angle pointer calculator
Calculate satellite dish angle.

Series - Parallel Impedance Conversion Calculator
Any impedance can be expressed as either an equivalent series or parallel impedance for a given frequency. The calculator will convert in either direction.

Sine Look Up Table Generator Calculator
This calculator generates a single cycle sine wave look up table. It's useful for digital synthesis of sine waves.

Skin Depth Calculator | SiversIMA
Choose the conductor material and enter the frequency. The calculator will return the skin depth information.

Skin Effect Calculator
Skin depth is defined as the distance below the surface where the current density has fallen to 1/e or 37% of its value at the surface.

Snubber Circuit Design Calculators
This engineering tutorial article not only explains common snubber circuits but provides several design calculators, that make snubber design easy.

Solenoid (Electromagnet) Force Calculator
This calculator computes the force between a solenoid and another piece of ferromagnetic material separated by a gap of distance g.

Standard Resistor Value Calculator: 1%, 5%, 10% - EIA: E12, E24, E96
This calculator will select the closest standard resistor value, from 1% 5% or 10% standard EIA values, calculates the error, and prints out a table of the standard values for the given tolerance.

Steinhart-Hart Thermistor Calculator
Thermistor resistance is related to temperature in degrees Kelvin. In the standard Steinhart-Hart equation the C parameter is set to zero. However, some manufacturers use all 4 coefficients. In the calculator, you can specify whether to use this term or not, by just setting it to zero.

Stepper Motor Calculator
This calculator computes the maximum speed of a stepper motor, which is limited by the time it takes for the coil to energize to it's maximum holding current, and then de-engergize as polarity flips.

Straight Wire Inductor Calculator
This calculator computes the inductance of a microstrip etched on a PCB.

Switching Converter Power Supply Calculator
The following is a design tool which calculates the parameters for a buck converter, boost converter or Buck-Boost Converter - (Step-down/Step-up or inverting).

T Attenuator Calculator
This program computes the minimum loss (Min Loss) which will yield and attenuator having any desired loss.

T Attenuator calculator.
Calculates the resistor values, attenuation, 'impedance', reflection coefficient, VSWR and return loss of a T attenuator.

Tank Circuit Resonant Frequency Calculator
For a capacitor / inductor tank circuit, showing the formula used.

Thermal Noise Calculator
This calculator calculates the noise RMS Voltage for a circuit element for a given bandwidth, resistance and temperature.

VSWR/Return Loss Converter | SiversIMA
Convert VSWR to Return Loss and vice versa.

Voltage Divider Calculator
One of the most basic and common circuits is the two resistor voltage divider. The ratio of the resistors divides and input voltage down to a lower voltage. This calculator simplifies the task.

Voltage Summer Calculator
A common analog mathematical computation is to add several voltages: Vo= V1+ V2.. VN. This is easily done with the following circuit.

Wavelength Calculator (TEM) | SiversIMA
Calculate a wavelength in the presence of a dielectric. Applies to Transverse ElectroMagnetic propagation.

Welcome to Times Microwave | Coaxial Cable - Attenuation & Power Handling Calculator
The calculator above can be used to estimate the attenuation (dB loss), power handling capability, and transmission efficiency for some of the more popular Wireless Communications and MIL Spec cables at the frequency of interest (below Cutoff Frequency).

Wheatstone Bridge Calculator
Wheatstone bridge are used in all sorts of sensor devices such as strain gauges, pressure gauges, etc.

Whip Antenna Design Calculator
When the antenna is perfectly tuned then it looks like a pure resistance tied to ground. This resistance is known as the radiation resistance.

Wideband Differential Amplifier Calculator
This calculator computes bias voltage and current levels, as well as gain and frequency response.

Z-S-Y-A Parameter Conversion Calculator
This calculator will convert between Z-Y-S parameters. S parameters are a function of the characteristic impedance. All impedances are expressed in rectangular form (R+Xj).

dBm/Linear Power Converter | SiversIMA
Convert between dBm and linear power.

kpa to atm | atm to kpa conversion calculator
This calculator converts kilopascal (kpa) to atmoshphere (atm) and vice versa. The Kilopascal and atmoshphere are the units for pressure measurement.

mm Wave Link Budget Calculator | SiversIMA
Enter in the Tx, Channel and Rx parameters and the available SNR will be calculated.

oz to mils conversion
The formula converts Copper Plating Weight in oz to thickness in inch. This is useful for PCB designer willing to know the thickness corresponding to a copper plating weight to inch or mils.


iPhone and iPod calculators

App Store - Transmission Line Calc
Transmission Line Calc allows you to perform several calculations related to RF transmission Lines.


iPad calculators

App Store - Transmission Line Calc
Transmission Line Calc allows you to perform several calculations related to RF transmission Lines.

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