A growing collection of free, interactive calculators — Ohm's Law and RLC resonance to BMI, pregnancy and EV savings — each with live circuit diagrams and step-by-step math.
Search by name or browse by discipline — every tool opens instantly with live diagrams and step-by-step math.
Real answers, real visuals, zero friction. Everything you need, nothing you don't.
Diagrams, waveforms, and phasor plots update in real time as you type your values.
Every result includes the formula, substitution, and step-by-step calculation. Learn as you calculate.
No loading spinners, no accounts, no ads. Runs entirely in your browser — even without internet.
IPC-2152 trace sizing, E24 resistor values, datasheet LED voltages — results you can trust in real designs.
This calculator suite brings together a full set of free, interactive engineering tools in one focused place. From the fundamentals of Ohm's Law and DC power to advanced RLC resonance, PCB trace design, and antenna gain, every calculator delivers an instant answer with a live diagram and the formula behind it.
Students use the step-by-step working to master circuit theory. Hobbyists size resistors, LEDs, and converters for real projects. Professional engineers run quick sanity checks against the same standards their work depends on. No sign-up, no paywall, no tracking — just precise tools that load instantly and work offline.
The suite spans eight color-coded categories — DC & Resistors, Reactive Components & RLC, Power & Circuits, PCB Design, Signal & RF, Digital Logic, Health & Body, and Energy & Environment. Use the search box to jump directly to a tool, or browse by discipline. The collection keeps growing.