Unit Converters
Angle Unit Converter
Convert angle measurements between degrees, radians, and gradians for math, engineering, and surveying applications.
Area Converter
Convert square feet, square metres, acres and hectares with correctly squared length factors, an exact factor table and land parcel and floor area figures.
Cooking Volume Converter
Convert cooking and baking measurements between US cups, tablespoons, teaspoons, and milliliters.
Data Storage Converter
Convert digital storage capacity between bytes, kilobytes, megabytes, gigabytes, and terabytes using binary (1024-based) units.
Data Transfer Rate Converter
Convert Mbps, MB/s, Gbps and other data rates, and see exactly why a 100 Mbps line downloads at only 12.5 MB/s, with a full bit-to-byte cross-reference table.
Density Unit Converter
Convert density values between kilograms per cubic meter, grams per cubic centimeter, and pounds per cubic foot.
Energy Conversion Calculator
Convert joules, calories, food kilocalories, kilowatt-hours, BTU and foot-pounds with exact factors, plus a one-kilowatt-hour comparison across six units.
Fuel Economy Unit Converter
Convert vehicle fuel economy between miles per gallon (US), liters per 100 kilometers, and kilometers per liter.
Geometry Area Converter
Convert a calculated shape area into any area unit, with the shape formulas that feed it, correctly squared factors and a complete unit reference table.
Length Converter
Convert metres, feet, inches, yards, miles and kilometres using the exact 1959 factors, with a full cross-reference table and the pivot formula explained.
Oven Temperature Converter
Convert oven temperatures between Fahrenheit, Celsius and British gas marks using the standard gas mark reference table and its irregular low-end steps.
Power Conversion Calculator
Convert watts, kilowatts, mechanical horsepower and metric PS, which differ by 1.4 percent, with exact factors and a horsepower to kilowatt reference table.
Pressure Converter
Convert PSI, bar, pascal, atmospheres, mmHg and inHg using defined constants, with a factor table plus one-atmosphere and tyre pressure reference figures.
Speed Converter
Convert mph, km/h, m/s, knots and ft/s using exact defined factors, with a full cross-conversion table and speed limit equivalents for road and air travel.
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine with the exact offset formulas, absolute-zero guard rails and a side-by-side four-scale reference table.
Time Unit Converter
Convert time durations between seconds, minutes, hours, days, and weeks using simple fixed multipliers.
Torque Unit Converter
Convert torque values between newton-meters, foot-pounds, and inch-pounds for automotive, tool, and engineering specifications.
Volume Converter
Convert litres, US and imperial gallons, quarts, pints and cups, keeping the two gallon systems strictly apart, with kitchen and fuel reference tables.
Volume Unit Converter
Convert cubic feet, cubic metres, litres, gallons and barrels on a single scale, with the cubed factors explained and a full twelve-unit reference table.
Weight Converter
Convert kilograms, pounds, ounces, stone and tons using the exact 0.45359237 pound definition, with factor tables and body weight reference figures in stone.
The Same Number, in a Different Language
Every measurement system — metric, imperial, and the dozens of specialized units in between — describes the same underlying physical quantities, just in different-sized units. These thirteen calculators convert between them.
Popular Unit Converters
- Temperature Converter — converts between Celsius, Fahrenheit, and Kelvin.
- Weight Converter — converts between kilograms, pounds, ounces, and other mass units.
- Pressure Converter — converts between pascals, PSI, bar, and other pressure units.
Related: Math Calculators, Physics Calculators for the science these units describe.