Unit Converter – Every Everyday Unit in One Place

One converter for the units daily life actually mixes up: miles and kilometres, pounds and kilos, Fahrenheit and Celsius, gallons and litres, megabits and megabytes. This free unit converter covers length, weight, temperature, volume, speed and data with exact international conversion factors, shows the formula behind every answer, and swaps direction in one tap.

How to Use the Unit Converter

Pick a category, type your value, and choose the units on each side — the result updates as you type, and the line underneath shows the exact relationship behind it ("1 Mile = 1.609344 Kilometre"), so you can sanity-check the answer instead of trusting a black box. The swap button reverses the conversion without retyping, which is the fastest way to check a figure in both directions. Every category remembers nothing and uploads nothing: the factors live in the page, and the maths happens in your browser.

Why one converter instead of six? Because real questions refuse to stay in one category. A recipe sends you from cups to millilitres and from Fahrenheit to Celsius in the same breath; a hosting plan mixes gigabytes with gigabits; a car review quotes litres per 100 km against miles per gallon thinking. Having every everyday unit behind one consistent interface — same behaviour, same precision, same formula transparency — removes the tab-hopping and the risk of landing on a converter that quietly uses a rounded factor.

The Exact Factors Behind the Answers

Every conversion here is built from definitions, not approximations. The inch is exactly 2.54 cm by international agreement (1959), which makes the foot exactly 0.3048 m and the mile exactly 1,609.344 m. The pound is exactly 0.45359237 kg. The US gallon is exactly 3.785411784 litres, while the Imperial gallon is 4.54609 litres — a real difference of about 20% that still catches people out when a British and an American recipe meet. Temperature is the odd one out: the scales have different zero points, so conversion needs the full formulas rather than a single factor:

Data Units: Why Your Drive Looks Smaller Than the Box

The data category quietly settles an argument that has run for thirty years. Drive makers sell capacity in decimal units (1 GB = 1,000,000,000 bytes, the SI definition), while operating systems historically reported in binary units (1 GiB = 1,073,741,824 bytes) but labelled them "GB". A 500 GB drive therefore "shrinks" to about 465 of the units your computer displays — nothing is missing; the two rulers differ by 7.4%. This converter lists both families side by side with their correct names (KB versus KiB) so you can convert between what the box says and what the screen says. Internet speeds add the other classic trap: plans are sold in megabits per second, downloads are measured in megabytes — divide the headline speed by eight (and use the Bit/Byte units here) to get the download rate you will actually see.

Worked Examples

A marathon is 26.2 miles: at exactly 1.609344 km per mile, that is 42.16 km — which is why the official 42.195 km race distance and the folk figure never quite agree, the folk figure being rounded. A driver weighing 180 lb is 81.65 kg, the number a European gym or a medical form wants. A US recipe's 350 °F oven is 176.7 °C, which British recipes round to 175 °C or gas mark 4. And a 65-inch television's screen diagonal is 165.1 cm — measured, as screens always are, corner to corner. Each of these is one conversion in the box above; the formula line under the result shows the exact relationship used, so you can repeat it on paper if you ever need to.

Two units deserve a footnote because the converter's answers surprise people. The stone, still the everyday weight unit for people in the UK and Ireland, is exactly 14 pounds (6.35029318 kg) — a British "11 stone 4" is 158 lb or 71.7 kg. And the knot is one nautical mile per hour, the nautical mile being exactly 1,852 m because it was defined from the Earth's geometry — one minute of latitude — which is why sailors and pilots still navigate in it while everyone else uses kilometres.

Limitations

The converter covers six everyday categories well rather than every unit in science: there are no pressures, energies, torques or radioactivity units here, and currency is deliberately absent because exchange rates change by the minute — use the dedicated Currency Converter for live figures. Results are shown to ten significant figures, which exceeds any real-world measurement you will convert; for engineering work, confirm critical values against your industry standard. Cooking measures use US teaspoons and tablespoons, since metric and Australian spoons differ slightly — the honest differences are small but real, and for baking by weight beats volume every time.

Frequently Asked Questions

Related Tools

Find this converter and the rest of the conversion toolkit in the Converters category.