📐 Unit Converter

How it works

• For linear units (length, weight, volume, area, speed, data), the value is first converted to a base unit (metres, kilograms, litres, m², m/s, bits) then scaled to the target.
• Temperature is a special case because its scales are offset, not just scaled. Celsius ↔ Fahrenheit: °F = °C × 9/5 + 32. Kelvin: K = °C + 273.15.
• Data units: KB/MB/GB/TB use decimal SI multiples (1 KB = 1 000 bytes); KiB/MiB/GiB use binary IEC multiples (1 KiB = 1 024 bytes). These are distinct units.
• All calculations run entirely in your browser — no network request is made.

Everything runs locally in your browser. No values are ever sent to a server. No cookies or local storage are used by this tool.

• Up to ~15 significant digits of precision (JavaScript Number / IEEE 754 double).
• Mach speed is approximate (sea-level, 20 °C air); actual speed of sound varies with altitude and temperature.
• US customary units (cups, pints, gallons) use US definitions. UK/Imperial measures differ slightly.
• Extremely large or small values may display in exponential notation.

• 1 mile = 1.609 344 km
• 100 °C = 212 °F = 373.15 K
• 1 GB (decimal) = 1 000 000 000 B; 1 GiB (binary) = 1 073 741 824 B
• 60 mph ≈ 96.56 km/h
• 1 acre = 4 046.86 m²