Everyday
Unit Converter
Miles to kilometres, pounds to kilos, Fahrenheit to Celsius: six unit families, converted live.
An American recipe in ounces, a flight speed given in knots, a hike described in miles, a plot of land priced by the square foot: imperial and metric units cross paths constantly. This converter covers six families — length (metres, kilometres, miles, yards, feet, inches), weight (kilograms, grams, tonnes, pounds, ounces), temperature (Celsius, Fahrenheit, Kelvin), area (m², km², hectares, square feet), volume (litres, millilitres, m³, US gallons) and speed (km/h, m/s, mph, knots). Conversion works both ways: edit either field and the other follows instantly, with smart precision that spares you meaningless decimals. Free, no sign-up, and everything happens right in the page.
How does it work?
- Pick the family: length, weight, temperature, area, volume or speed.
- Select the source unit and the target unit.
- Type a value in either field: the conversion follows live.
- Copy the smartly rounded result.
Frequently asked questions
How many kilometres are in a mile?
A statute mile is exactly 1.609344 km — in practice, remember 1.6. The other way round, a kilometre is about 0.62 miles. Do not confuse it with the nautical mile (1.852 km) used at sea and in aviation, from which the knot derives: one knot = one nautical mile per hour.
How do I convert Fahrenheit to Celsius in my head?
The exact formula: °C = (°F − 32) × 5/9. For a quick estimate, subtract 30 and halve: 70°F ≈ 20°C (exact: 21.1°C). Useful landmarks: 32°F = 0°C (freezing), 98.6°F = 37°C (body temperature), 350°F = 177°C (the oven setting in American recipes).
How much is a pound in kilograms?
The avoirdupois pound (lb) is 453.592 grams — just under half a kilo — so a kilogram is about 2.2 pounds. It divides into 16 ounces of 28.35 g each, the ounce you meet in recipes. Not to be confused with the troy ounce (31.1 g), reserved for precious metals.
Why is a US gallon different from a UK gallon?
The two countries froze different standards in the 19th century: the US gallon is 3.785 litres, the British imperial gallon 4.546 litres — nearly a 20% gap. This converter uses the US gallon, the one behind American fuel prices and most online recipes. Always check where a document comes from.