Travel & distances
Converting kilometres to miles for road trips, or altitude in metres to feet for hiking.
5 categories · All units at once
Unit Converter
Convert length, weight, temperature, volume and speed. Enter one value and see it in every unit of the category at once.
Result
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Enter a value to see every conversion in the category.
Conversion Logic
Multiplicative units
Length, weight, volume and speed convert by multiplying the input by a fixed factor to reach the base unit, then dividing by another factor to reach the target unit. Every conversion in this calculator uses internationally standard factors.
Temperature
Temperature is different — it uses offsets, not just ratios. The formulas are:
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
US vs metric units
Units marked US in the conversion table are predominantly used in the United States. The others are metric or international. Both are exact — the US fluid ounce, cup, pint, quart and gallon differ from their British imperial counterparts, so this calculator uses the US standards for those units.
Precision and rounding
Conversions are shown to a sensible number of decimal places. Where a value would be unwieldy (extremely small or large), scientific notation is used. The underlying value keeps full precision in the calculation.
Common Conversions
| From | To | Value |
|---|---|---|
| 1 inch | Centimetres | 2.54 cm |
| 1 foot | Centimetres | 30.48 cm |
| 1 metre | Feet | 3.28084 ft |
| 1 mile | Kilometres | 1.60934 km |
| 1 kilogram | Pounds | 2.20462 lb |
| 1 stone | Kilograms | 6.35029 kg |
| 0 °C | Fahrenheit | 32 °F |
| 100 °C | Fahrenheit | 212 °F |
| 37 °C | Fahrenheit | 98.6 °F |
| 1 litre | US gallons | 0.264172 gal |
| 1 mile per hour | Kilometres per hour | 1.60934 km/h |
When You'll Need This
Cooking & baking
Converting cups to millilitres, ounces to grams, or Fahrenheit to Celsius for international recipes.
Fitness & weight
Kilograms to pounds for gym equipment, or stone to kilograms for UK medical forms.
Science & study
Chemistry, physics and engineering homework — the standard unit conversions you need.
Shipping & logistics
Package weights and dimensions in metric vs imperial for cross-border shipping.
DIY & home
Furniture dimensions, fabric lengths, or any measurement in a different unit system.
Unit FAQ
How many centimetres in an inch?
There are exactly 2.54 centimetres in one inch.
How many pounds in a kilogram?
One kilogram equals approximately 2.20462 pounds.
How do I convert Celsius to Fahrenheit?
Multiply by 9, divide by 5, then add 32. Formula: °F = (°C × 9/5) + 32.
How many feet in a metre?
One metre equals approximately 3.28084 feet.
How many kilometres in a mile?
One mile equals approximately 1.60934 kilometres.
What is a stone?
A stone is a British unit of weight equal to 14 pounds, or approximately 6.35 kilograms. Still commonly used in the UK for body weight.
Are US and UK cups the same?
No. A US cup is 236.6 ml, while a UK cup is 250 ml. This calculator uses the US standard.
Are the conversions exact?
Yes. All conversions use internationally standard factors. Any difference you see will be due to rounding in the display, not in the calculation.
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