Unit Converter — length, weight, volume, temperature, data

Unit Converter

Conversions route through each category's SI base unit using exact definition factors — one mile is exactly 1.609344 kilometers by international definition.

Results are computed from your inputs and rounded for display. Verify important figures independently.

Seven categories — length, weight, volume, area, speed, temperature, and data — converted through exact international definition factors, not rounded approximations. Temperature converts by formula (it has offsets, not just a factor).

Method & sources

Every unit carries an exact factor to its category's base unit (meter, kilogram, liter…), per the international definitions catalogued in NIST Special Publication 811: 1 mi = 1.609344 km, 1 lb = 0.45359237 kg, 1 in = 2.54 cm — all exact. Temperature: °F = °C × 9/5 + 32; K = °C + 273.15. Data offers both decimal (KB = 1000 B) and binary (KiB = 1024 B) units — they are different things, both provided.

Worked examples

1 mile = 1.609344 km (exact)
100 °C = 212 °F
1 GiB = 1,073,741,824 bytes (exact)

Limits

US customary volume units are used (a UK imperial gallon differs); display shows up to 12 significant digits.

Frequently asked questions

Why do KB and KiB give different answers?

KB is decimal (1000 bytes) per SI; KiB is binary (1024 bytes) per IEC. Storage marketing uses decimal, operating systems often binary — both are provided explicitly.