Ampacity Calculator

Helping students grasp electronics basics with clear explanations and handy tools.

A cozy study desk with electronics textbooks, a soldering iron, and a circuit board in progress.
A cozy study desk with electronics textbooks, a soldering iron, and a circuit board in progress.
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Close-up of hands using a multimeter to measure current on a simple circuit.
Close-up of hands using a multimeter to measure current on a simple circuit.
What is Ampacity?

Ampacity is the maximum continuous current a conductor can carry without exceeding its temperature rating.

Calculation model

This calculator uses a simplified thermal balance between electrical losses and heat dissipation.

Imax = √( ΔT / ( Relec · Rth ) )

Where:

  • ΔT = Tmax − Tambient

  • Relec = electrical resistance per meter

  • Rth = total thermal resistance to air

This allows independent verification using basic heat transfer theory.

Our Tools

Handy calculators and explanations to help you master electronics basics.

A student using a laptop with an ampacity calculator open on the screen, surrounded by electronic components.
A student using a laptop with an ampacity calculator open on the screen, surrounded by electronic components.
Close-up of colorful resistors and transistors laid out neatly on a wooden desk.
Close-up of colorful resistors and transistors laid out neatly on a wooden desk.
Ampacity

Calculate safe current limits for wires quickly and accurately.

Basics

Clear explanations of transistors, antennas, resistors, and more.

Projects

Hands-on tools and examples for learning electronics.

Close-up of a student assembling a simple circuit on a breadboard with colorful wires.
Close-up of a student assembling a simple circuit on a breadboard with colorful wires.
Ampacity Calc

Calculate wire current limits easily.

Screenshot of the ampacity calculator interface showing input fields and results.
Screenshot of the ampacity calculator interface showing input fields and results.
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Diagram illustrating how different wire gauges affect current capacity.
Diagram illustrating how different wire gauges affect current capacity.
Student using a multimeter to measure resistance on a circuit board.
Student using a multimeter to measure resistance on a circuit board.
Basic Tools

Simple calculators for electronics basics.

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