Unit Converter

Choose a category, enter a value and select its source unit. All compatible units update live; the source row is highlighted. Decimal comma or point and scientific notation are accepted without thousands separators. CSV contains full numeric precision; the table shows up to 12 significant digits and the full number on hover. Select a value in the table to copy the computed number at its full available precision. The clipboard uses a decimal point.

Temperatures are absolute readings, not temperature differences; values below 0 K are rejected. SI prefixes scale a dimensionless value. Decimal kB = 1000 B, binary KiB = 1024 B, 1 B = 8 bit.

Conventions: y = Julian year (365.25 days); ly uses that year and exact c; gal/pt/fl oz (US) use US liquid measures; gal (UK) is imperial. cal/kcal are thermochemical, BTU is International Table, hp is mechanical (550 ft·lbf/s), mmHg uses conventional mercury density and gravity. Negative signed values are permitted outside absolute temperature. Finite binary64 arithmetic; values outside its range are marked per row.