Tools · free electronics calculators

Electronics calculators for students & makers

13 free calculators we use on the bench every day — Ohm's law, LED resistors, resistor colour codes, 555 timers, capacitor codes and more. Pick one to open it. Each calculator shows the formula, so you learn the maths while you use it, and everything runs in your browser.

Pick a calculator

Basics
Timing & signals
Component codes
Power

Basics · 6

Timing & signals · 2

Component codes · 3

Power · 2

These tools are for learning and low-voltage hobby circuits (12 V and below, like in our labs). Always check a part's datasheet. Never use them to plan mains (230 V) wiring.

Want to really understand these formulas?

EC-01 Basic Electronics teaches all of this on real hardware — from Ohm's law to a soldered 555 flasher.

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