Convert between square millimetres, centimetres, metres and kilometres, square inches, feet, yards and miles, plus acres and hectares. An acre is exactly 4840 square yards, and the tool uses that.
Convert decimal numbers to binary
Convert between 150+ world currencies with live exchange rates. Free online currency converter for USD, EUR, GBP, JPY, and more. Instant conversions for travel, business, and shopping.
Convert between data size units.
Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, foot-pounds and electronvolts. The kilocalorie shown is the Calorie on food labels.
Convert miles per gallon to litres per 100 km and back, keeping US and imperial gallons separate. These are reciprocals, not scalings — halving your consumption doubles your mpg.
Convert decimal numbers to hexadecimal
Convert between length units.
Convert decimal numbers to octal
Convert between pascals, kilopascals, bar, millibar, psi, atmospheres, torr and inches of mercury. One atmosphere is exactly 101325 pascals by definition.
Convert between kilometres per hour, miles per hour, metres per second, feet per second, knots and Mach. Every factor is the defined value, not a rounded one.
Convert between Celsius, Fahrenheit, and Kelvin.
Convert between litres, millilitres, cubic metres, US and imperial gallons, pints, cups, tablespoons and teaspoons. US and imperial units are kept separate, because they genuinely differ.
Convert between weight units.