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Measurements are everywhere in everyday life: your weight in kg or lb, your height in cm or inches, road distances in miles or kilometers, and recipes in grams, ounces, cups, or litres. Different countries and industries prefer different systems, so being able to quickly convert between them is very handy.
Broadly speaking, there are two big families of units in common use today: the modern metric (SI) system, and older systems such as the imperial and US customary units. Metric is based on powers of ten (millimeters, centimeters, meters, kilometers; grams, kilograms; millilitres, litres), which makes it easy to scale up and down. Imperial and US customary units use inches, feet, yards, miles, ounces, pounds, pints, and gallons, and are still used heavily in everyday life in countries like the United States and the United Kingdom.
Behind the scenes, this converter works by converting everything into a single “base unit” inside each category, then converting back out to the unit you asked for. For example, all mass units are converted internally to kilograms, and all length units are converted to meters. This approach keeps the conversions consistent, even if you chain together unusual pairs such as micrograms to tons, or nautical miles to feet.
The goal of conversionsofeverything.com is to give you a fast, simple, mobile-friendly unit converter that covers the most common situations first (kg ↔ lb, cm ↔ inches, °C ↔ °F, km ↔ miles), while also supporting more technical units such as pressure, energy, power, data, and angles. New units and categories can be added over time as people request them.
The metric (SI) system was designed to be simple and consistent, with everything based on powers of ten. Older imperial and US customary systems grew more organically over time and still survive in everyday use in some countries. This site lets you move easily between the two worlds.
One kilogram is defined precisely, and one international avoirdupois pound is defined as exactly 0.45359237 kilograms. That means 1 kg = 2.2046226218... lb. This converter uses accurate factors so you get reliable results to several decimal places.
The US gallon and the UK (imperial) gallon come from different historical definitions. A UK gallon is larger than a US gallon (about 4.546 litres vs 3.785 litres). That’s why this converter includes both US gallons and UK gallons as separate units.
For exact relationships (like inches to centimetres, pounds to kilograms, metres to feet) the converter uses standard, widely accepted conversion factors. Results are rounded for readability, but the underlying math keeps full precision and is suitable for everyday use, study, and most professional tasks.
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