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Free Unit Converter.
Convert kg to stones and pounds, metres to feet and inches, miles to km, °C to °F and UK or US pints — type a value and every unit updates live, right in your browser. Seven categories, UK units included, nothing uploaded.
Not uploaded — runs in your browser 7 categories, 40+ units Live two-way conversion No subscription or account
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Unit converter: quick facts
Convert length, weight, temperature and more as you type.
Updated
- Price
- Free, no sign-up.
- Categories
- Length, weight, temperature, volume, area, speed and time.
- UK units
- Stone, feet and inches, miles, UK pints, fluid ounces and gallons, with a stones-and-pounds and feet-and-inches readout.
- Accuracy
- Standard international factors (1 inch = 2.54 cm), to about 6 or 7 significant figures.
- Both ways
- Type in either box and the other updates; a table shows every unit at once.
- Privacy
- Worked out in your browser.
How it works
How to convert units
Pick a category, choose the two units, and type a number into either box. The other box and the quick reference table update as you type.
- 01
Pick a category
Choose length, weight, temperature, volume, area, speed or time.
- 02
Type a value
Enter a number in either field — the other one updates instantly.
- 03
Copy the result
Use the copy button, or scan the quick-reference table below.
Common conversions
Common UK conversions at a glance
The figures people look up most, rounded to six significant figures. Type your own number in the converter above for anything else.
| Type | Amount | Equals |
|---|---|---|
| Length | 1 metre | 3.28084 feet (39.37 inches), or 0.000621371 miles |
| Length | 1 mile | 1.609344 km (exactly), or 1,760 yards |
| Length | 1 km | 0.621371 miles |
| Length | 1 inch | 2.54 cm (exactly) |
| Length | 5 ft 10 in | 177.8 cm |
| Length | 1.8 m | 5 ft 10.9 in |
| Weight | 1 kg | 2.20462 lb |
| Weight | 1 stone | 14 lb, or 6.35029 kg |
| Weight | 70 kg | 11 st 0.3 lb (154.3 lb) |
| Weight | 1 lb | 453.592 g |
| Temperature | 0°C / 37°C / 180°C | 32°F / 98.6°F / 356°F |
| Volume | 1 UK pint | 568.261 ml (a US pint is 473.176 ml) |
| Volume | 1 UK gallon | 4.54609 litres (a US gallon is 3.78541 litres) |
| Area | 1 square metre | 10.7639 square feet |
| Area | 1 hectare | 2.47105 acres; 1 acre is 4,046.86 m² |
| Speed | 100 km/h | 62.1371 mph; 70 mph is 112.654 km/h |
Tips
Tips for converting without mistakes
Most conversion slip-ups come from mixing up which kind of unit is meant, not from the maths.
- UK and US pints aren’t the sameA UK pint is about 568 ml and a US pint about 473 ml, and gallons and fluid ounces differ in the same way. Check which one a recipe or product label means before converting.
- Working in stones and poundsOne stone is 14 pounds, or about 6.35 kg. For 11 st 4 lb, multiply 11 by 14 and add the 4 to get 158 lb, then convert that figure.
- Temperature isn’t a simple multiplyCelsius and Fahrenheit start from different zero points, so you can’t just scale one to get the other. For a rough idea, double the Celsius figure and add 30; the converter gives the exact answer.
- Scan the quick referenceThe table shows your value in every unit of the category at once, which helps when you’re not sure which unit a form or recipe is asking for.
Like every Altto tool, this runs on your device — nothing you add is uploaded. How Altto works
2.54 cm
is exactly one inch, fixed by international agreement in 1959, which is why conversions between inches and centimetres come out exact.
FAQ
Frequently asked questions
How the conversions work, plus quick answers to some of the most common ones.
How do I convert kg to stones and pounds?
Divide the kilograms by 6.35029 to get stones, then multiply the part after the decimal point by 14 to get the pounds. For example, 70 kg is 11.02 stone, which is 11 st 0.3 lb. Choose Weight, then Stone, and the converter shows the stones-and-pounds figure for you.
How do I convert metres or cm to feet and inches?
Divide the centimetres by 2.54 to get inches, then divide by 12: the whole number is feet and what is left over is inches. So 180 cm is 70.9 inches, or 5 ft 10.9 in. Pick Length, then Feet or Inches, and the converter shows feet and inches together.
How many miles is a metre?
One metre is 0.000621371 miles, because a mile is exactly 1,609.344 metres. A kilometre is 0.621371 miles, so for a quick estimate multiply kilometres by 0.6.
Can it convert cups to grams?
Not directly, because cups measure volume and grams measure weight, and the answer depends on the ingredient (a cup of flour weighs far less than a cup of sugar). The converter turns US cups into millilitres; for grams, use the weight per cup given on the packet or in the recipe.
How accurate are these conversions?
Every conversion uses standard, internationally recognized conversion factors (for example, 1 inch is exactly 2.54cm and 1 mile is exactly 1.609344km). Results are shown to about 6–7 significant figures — more than enough for cooking, DIY, homework or everyday estimates.
Which categories does this tool cover?
Length, weight, temperature, volume, area, speed and time — the seven categories people convert most often. It deliberately doesn't cover specialist units like pressure, energy or torque, which are a different, narrower use case.
Can I convert in either direction?
Yes — type into either the “From” or “To” field and the other one updates automatically, so you don't need to work out the conversion backwards by hand.
What's the quick reference table for?
It shows your currently selected “From” unit converted into every other unit in that category at once, so you can scan a few conversions without re-typing a value each time.
How do I convert km/h to mph in my head?
Multiply by 0.6 for a close estimate, so 100 km/h is about 60 mph. The exact figure is a little higher, as one mile is 1.609 km: 100 km/h is 62.1 mph. Choose Speed in the converter for exact figures.
Is a ton the same as a tonne?
Not quite. A metric tonne is 1,000 kg, a UK (long) ton is about 1,016 kg and a US (short) ton about 907 kg. When a figure matters, such as a vehicle or lifting limit, check which one is meant.
How do I convert square metres to square feet?
Multiply by about 10.76, as one square metre is 10.764 square feet. Area grows with the square of length, so a room twice as long and twice as wide has four times the floor area. The Area category does the exact sum.
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