Unit Converter
Convert measurements across 12 categories with clearly labeled unit standards.
Converted value
Definitions: NIST conversion factors and binary prefixes.
About Unit Converter
Convert length, mass, volume, speed, data storage, temperature, area, pressure, energy, power, time and angles in your browser. Defined conversion factors are retained at full precision where possible; JavaScript floating-point arithmetic and display rounding still apply. Results show up to 12 significant digits. Decimal data units use powers of 1000; binary units such as KiB and MiB use powers of 1024. Volume labels distinguish US customary, US nutrition, metric and Imperial measures. Acres use the international foot. Temperature conversions apply scale offsets and reject values below absolute zero. Time conversion treats a day as exactly 24 hours; use Date Calculator for calendar months and years.
Frequently Asked Questions
1 MB is 1,000,000 bytes. 1 MiB is 1,048,576 bytes (1024 squared). The converter labels decimal and binary units separately; it does not assume that MB means MiB.
A US customary cup is 236.5882365 mL, a US nutrition cup is 240 mL, and a metric cup is 250 mL. A US liquid gallon is 3.785411784 L; an Imperial gallon is 4.54609 L. Match the unit to your source.
Energy and power are different quantities. For example, kWh measures energy while kW measures power. Converting between them also requires a duration, so this tool keeps them in separate categories.
The tool uses defined conversion factors where available and displays up to 12 significant digits. Factors involving irrational numbers and normal floating-point arithmetic have finite precision. Very small or large results use scientific notation.