Unit Converters
Bi-directional unit converters for length, mass, temperature, area, volume, speed, data storage, and engineering units.
All Tools in this Category
Length Converter
Convert meters, feet, inches, centimeters, kilometers, and miles.
Weight / Mass Converter
Convert kilograms, pounds, ounces, grams, stones, and metric tonnes.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin with absolute zero validation.
Area Converter
Convert square meters, square feet, acres, hectares, and square kilometers.
Volume Converter
Convert liters, milliliters, gallons, cups, and fluid ounces with US/imperial distinction.
Speed Converter
Convert km/h, mph, m/s, knots, and ft/s.
Data Storage Converter
Convert bytes, decimal SI units (MB, GB, TB), and binary IEC units (MiB, GiB, TiB).
Time Unit Converter
Convert seconds, minutes, hours, days, weeks, and milliseconds.
Pressure Converter
Convert Pascals, bar, atmospheres, psi, and mmHg/torr.
Energy Converter
Convert Joules, kilowatt-hours, calories, and BTU with exact physical constants.
Measurement Standards & Unit Distinctions
Unit conversions are performed using international standard definitions (SI and ISO) without premature floating-point truncation.
Important Distinctions:
- US vs. Imperial Volume: A US gallon is exactly 231 cubic inches (~3.785 L), whereas an Imperial gallon is 10 pounds of water at 62°F (~4.546 L). Never treat them as interchangeable.
- Data Storage (SI vs. IEC): Decimal SI prefixes (MB, GB, TB) use powers of 10 (1 GB = 1,000,000,000 bytes). Binary IEC prefixes (MiB, GiB, TiB) use powers of 2 (1 GiB = 1,073,741,824 bytes).
- Absolute Zero: Temperatures cannot physically fall below absolute zero (-273.15°C, -459.67°F, or 0 Kelvin).