ElectroCalculators
Free electronics & electrical engineering calculators

Electronics & electrical calculators

Interactive tools for circuit design and electrical installation. Type values the way you write them on a schematic — 4k7, 100n, 20m — and get standard component values, power ratings and worked examples alongside every result.

Free calculators
1
Standards
IEC / IEEE
Registration
None
Engineering input
4k7

Basics

Ohm’s law, power, voltage dividers and the fundamental relationships every circuit rests on.

Ω

Ohm’s Law

Solve for voltage, current, resistance or power. Get all four values at once, plus the resistor wattage you actually need.

Why ElectroCalculators?

  • Engineering notation input. Type 4k7, 2M2 or 100n directly — no unit dropdowns to fight with.
  • Standard component values. Every computed resistor or capacitor value is snapped to the nearest E-series part, with the resulting error shown.
  • Power ratings, not just numbers. Results include the dissipation and the wattage you should actually specify.
  • Shareable and embeddable. Every result has its own URL, and every calculator can be embedded in your own site.
  • Verified formulas. Cross-checked against IEC and IEEE standards and standard reference texts, with unit tests against textbook worked examples.