Electrical Calculators

Our electrical calculator collection gathers 58 free online tools for power, transformers, inductance, RF and impedance, wire sizing, and circuit design.

Wire Size 14 uses

Cable Length Calculator

This cable length calculator finds the length of a conductor from its measured resistance and cross-sectional…

Inductance 2 uses

Gapped Core Inductance Calculator

This gapped core inductance calculator finds the inductance of a gapped ferrite core from the turns,…

Inductance 2 uses

Toroid Inductance Calculator

This toroid inductance calculator finds the inductance of a toroidal coil from the number of turns…

Inductance 4 uses

Air Core Coil Inductance Calculator

This air core inductance calculator finds the inductance of a single-layer air-core coil from its diameter,…

RF and Impedance 1 use

PCB Crosstalk Calculator

This PCB crosstalk calculator estimates the coupling between two adjacent microstrip traces from their spacing and…

Power 6 uses

mAh to Wh Calculator

This mAh to Wh calculator converts a battery’s milliamp-hour capacity into energy in watt-hours (and kWh)…

RF and Impedance 5 uses

Pi Network Calculator

This Pi network calculator designs a pi-section impedance-matching network for a chosen loaded Q. Enter the…

RF and Impedance 2 uses

T Matching Network Calculator

This T matching network calculator designs a T-section impedance-matching network for a chosen loaded Q. Enter…

Circuit 4 uses

Flyback Converter Calculator

This flyback converter calculator relates the output voltage, input voltage, duty cycle, and transformer turns ratio…

Wire Size 3 uses

Volume of a Conductor Calculator

This volume of a conductor calculator finds the volume of a wire or busbar from its…

Power 3 uses

Luminous Flux Calculator

This luminous flux calculator finds the total luminous flux in lumens from a source’s intensity in…

About Electrical Calculators

Our electrical calculator collection gathers 58 free online tools for power, transformers, inductance, RF and impedance, wire sizing, and circuit design. Pick a calculator below to get an instant result, the formula behind it, and a worked example.

Whether you are sizing a transformer, checking wire gauge, or matching an antenna, these tools remove manual math and unit-conversion mistakes. Every calculator states the equation it uses and defines each variable, so you can trust and reproduce the answer.

Browse the calculators

Power Calculators

Transformer Calculators

Inductance Calculators

RF and Impedance Calculators

Circuit Calculators

Wire Size Calculators

Frequently Asked Questions

What can I calculate with these electrical tools?

Power and power factor, transformer current and turns, inductance, RF and PCB impedance, wire size, and resistor or LED values. Each calculator covers one task with its formula and a numeric example.

Are these electrical calculators free?

Yes. Every tool on this page is free to use in your browser with no signup, and it works on both mobile and desktop.

Do the calculators show the formula?

Yes. Each page states the equation it uses, defines every variable, and includes a worked example so you can check the result by hand.

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