Length, weight, temperature, data, area, volume, time and speed conversion.
Convert between 8 unit families — length (m, km, ft, mi…), weight, temperature (°C/°F/K), data (B, KB, MB, GB…), area, volume, time and speed — with instant results.
100% client-side — zero uploads, maximum privacy
Instant results — no waiting for server processing
Secure — your data never leaves your browser
Free to use — no sign-up required
Real-time calculation as you type — no submit button needed
Step-by-step breakdowns for full transparency
Amortization schedules, unit conversions, and health formulas
Bookmarkable results for quick reference
Works offline after initial page load
Convert metric measurements to imperial for international projects
Convert data sizes between bytes, KB, MB, GB, and TB
Translate speed units for travel and logistics planning
Convert cooking measurements between metric and US units
Switch between temperature scales for scientific data
Eight families with 5-12 units each — the conversions people actually look up, from cm↔inch to MB↔GB.
Percentage of, percentage change and percentage increase/decrease.
Monthly payment, total interest and full amortization schedule.
Exact age in years, months, days, plus days until your next birthday.
Days between dates, add/subtract days from a date, weekday lookup.
Convert between decimal, hex, binary and octal with ASCII view.
Body Mass Index with healthy-range guidance.