Unit Converters

Convert metres, feet, inches, miles, nautical miles and light years, with the exact factor printed on every page.

Convert kilograms, pounds, ounces, stones, tonnes, carats and grains using the exact internationally defined factors.

Square metres, square feet, acres and hectares — plus Marla, Kanal and Bigha for South Asian land measurement.

Litres, millilitres, US and UK gallons, pints, quarts and cubic units, with the two gallon systems kept apart.

Cups, tablespoons, teaspoons, millilitres and fluid ounces — the volume measures a recipe is written in.

Cups to grams for plain, bread, cake, wholewheat and almond flour, plus oats, rice, cornflour and salt.

Cups to grams for granulated, brown and icing sugar, plus honey, cocoa powder and chocolate chips.

Cups to grams for butter, cooking oil, milk, water, yoghurt and peanut butter.

Seconds, minutes, hours, days, weeks and years, plus hertz, kilohertz, megahertz and gigahertz.

Bytes through terabytes, bits per second, and screen resolutions — with the 1000 versus 1024 question answered explicitly.

Km/h, mph, knots and Mach, plus newtons, pounds-force, torque units and angle measures.

Joules, calories, kilowatt-hours, BTU, watts and horsepower, plus fuel economy and running cost.

Pascals, bar, psi, atmospheres and mmHg, plus flow rate, density, viscosity and concentration.

Lux, foot-candles, nits and candelas, decibel measures, and radiation and magnetic field units.

Pixels, points, ems, rems, picas, millimetres and inches for print and screen work.

Convert blood test results between conventional units (mg/dL) and SI units (mmol/L), with the factor derived from each substance's molar mass.