About ElectroCalc
Free, accurate electronics calculators for engineers, students, and makers.
What is ElectroCalc
ElectroCalc is a collection of free, accurate electronics calculators built for engineers, students, and makers. No registration, no ads in the way of the tools, no paywalls — just the calculations you need.
Why trust these calculators
- All formulas follow IEC and IEEE standards
- Results verified against reference textbooks (Horowitz & Hill "The Art of Electronics", Sedra/Smith)
- Open to feedback: if you find an error, reach out at contact@electrocalc.dev
- 51 calculators covering DC circuits, filters, timing, RF, and power electronics
Who built this
Built and maintained by an electronics engineer based in Spain. Started as a personal tool, now shared publicly because good free resources are hard to find.
Contact
For errors, suggestions, or feedback: contact@electrocalc.dev
Our Methodology
Every calculator on ElectroCalc is built from first principles using peer-reviewed formulas. We cross-reference results against standard references: Horowitz & Hill "The Art of Electronics" (3rd ed.), Sedra & Smith "Microelectronic Circuits" (7th ed.), and the Texas Instruments application note library. All formulas are stated explicitly on each calculator page so you can verify them independently.
Accuracy & Limitations
ElectroCalc calculators assume ideal components unless stated otherwise. Real-world components have tolerances (typically ±1–5% for resistors, ±10–20% for capacitors). Always verify critical designs with measurements and consult manufacturer datasheets. The calculators are tools for rapid estimation and learning — not a substitute for professional engineering review in safety-critical applications.
Coverage
Current coverage includes DC circuits (Ohm's Law, resistor networks, power), analog filters (RC, LC, RLC), op-amp circuits, power electronics (LED drivers, voltage regulators, SMPS), timing circuits (555 timer, crystal oscillators), digital interfaces (I²C, PWM), and RF basics (antenna, skin effect). New calculators are added regularly based on user requests.