Unit Converter
Pick a category to open the converter with all units and a quick-reference table of common conversions.
Convert between kilometres, miles, metres, feet, inches, yards and nautical miles.
Convert between kilograms, pounds, grams, ounces, tonnes and stones.
Convert between Celsius (°C), Fahrenheit (°F) and Kelvin (K).
Convert between litres, gallons (US / UK), cubic metres, fluid ounces and millilitres. For cooking measurements use the dedicated recipe converter.
Convert between square metres, square feet, acres, hectares and square kilometres.
Convert between kilometres per hour, miles per hour, metres per second, knots and feet per second.
Convert between bytes, kilobytes, megabytes and gigabytes — in both decimal (KB = 1000 B) and binary (KiB = 1024 B) systems.
Frequently asked questions
How many unit categories are supported?
Seven: length, weight/mass, temperature, volume, area, speed and data (with both decimal and binary prefixes for gigabytes/gibibytes).
How is temperature converted?
Temperature is non-linear — Celsius, Fahrenheit and Kelvin are converted via Celsius as the pivot. The formulas: °F = °C × 9/5 + 32; K = °C + 273.15.
What is the difference between MB and MiB?
MB (megabyte) is decimal — 1 MB = 1,000,000 bytes. MiB (mebibyte, IEC standard) is binary — 1 MiB = 1,048,576 bytes (2²⁰). Drive manufacturers advertise in MB while operating systems report MiB — which is why your drive looks smaller than the box says.
Are the conversions accurate?
Yes. They use the official SI and BIPM (Bureau International des Poids et Mesures) definitions — 1 mile = 1609.344 m, 1 pound = 453.59237 g, 1 inch = 25.4 mm. Results are rounded to 4–6 significant figures depending on scale.
Why is there a separate cooking converter?
It is optimised for kitchen measurements — teaspoons, tablespoons, cups (US 240 ml), fluid ounces — that are not needed here. This converter covers general scientific and engineering units.
Is my data stored?
No. All calculations run entirely in your browser — nothing is sent to a server or stored.