Free Online Unit Converters

Length ConverterConvert metres, kilometres, miles, feet, inches and more. Weight ConverterConvert kilograms, grams, pounds, ounces and stones. Temperature ConverterConvert Celsius, Fahrenheit and Kelvin accurately. Area ConverterConvert square metres, acres, hectares and square feet. Volume ConverterConvert litres, millilitres, gallons, cups and cubic units. Speed ConverterConvert kilometres per hour, miles per hour, knots and metres per second. Data Storage ConverterConvert bytes, kilobytes, megabytes, gigabytes and terabytes. Time ConverterConvert seconds, minutes, hours, days and weeks. Pressure ConverterConvert pascals, kilopascals, megapascals, bar, psi, atmospheres, mmHg and inHg with an all-units result table. Energy ConverterConvert joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU and foot-pounds. Power ConverterConvert watts, kilowatts, megawatts, mechanical horsepower, BTU per hour and kilocalories per hour. Force ConverterConvert newtons, kilonewtons, dynes, pound-force and kilogram-force. Angle ConverterConvert degrees, radians, gradians, turns, arcminutes and arcseconds. Frequency ConverterConvert millihertz, hertz, kilohertz, megahertz, gigahertz and revolutions per minute. Density ConverterConvert common density units including kg/m³, g/cm³, kg/L, g/L, lb/ft³ and lb/in³. Torque ConverterConvert newton-metres, kilonewton-metres, pound-feet, pound-inches and kilogram-force metres. Fuel Economy ConverterConvert US MPG, Imperial MPG, kilometres per litre and litres per 100 km with correct inverse fuel-consumption handling. Digital Transfer Rate ConverterConvert bits or bytes per second across decimal and binary transfer-rate units, with an all-units comparison table and clear bit/byte distinction. Cooking Measurement ConverterConvert cooking volumes and weights, plus approximate volume-to-weight conversions for common ingredients using labelled density assumptions.