Fast, accurate calculators for electronics and software engineering. No ads in your face, results as you type, shareable links.
Convert between binary, octal, decimal, hex, or any base 2–36 — every base shown at once, correct at any size.
Type full expressions like (0xFF << 2) | 0b1010 — see the result in hex, decimal, octal, and binary at once.
Enter any two values — voltage, current, resistance, or power — and the other two are calculated instantly.
Add as many resistors as you like, see the schematic and totals live — or work backward from a target resistance.
Pick your supply, LED, and current — get the exact resistor, the nearest standard value, and the power rating you need.
Find the minimum wire gauge for your voltage, current, and run length — sized by voltage drop, for copper or aluminum.
File size ÷ link speed, done right — decimal vs binary units handled correctly, with presets for common interfaces.
Convert frequency ↔ period instantly, with wavelength, angular frequency, and clock-cycle timing thrown in.
Every calculator on this site follows the same rules: results update as you
type, values accept engineering prefixes like 4.7k and
100n, every result has a copy button, and the address bar always
holds a link you can share that reproduces your exact calculation. Nothing is
sent to a server — all math runs in your browser, instantly.