Measurement Converter
Convert length, weight, volume, temperature and area – plus grams to cups for baking. Results update as you type.
Result
Enter an amount to convert it.
Metric, imperial and US measures
The UK uses metric units for most things but still talks in miles, pints and stones, while American recipes and products use US customary units. Some names are shared but the sizes aren’t: a US pint, gallon or fluid ounce is different from the UK one. The converter keeps them separate so you always know which you’re getting.
Results are shown to 7 significant figures with trailing zeros removed. The conversion factors are the official definitions, so length, weight, volume and area results are exact to that precision.
Length and distance
One inch is exactly 2.54 cm, one foot is 12 inches (30.48 cm), and one mile is 1,760 yards or about 1.61 km.
- 1 in = 2.54 cm
- 1 ft = 0.3048 m
- 1 mile = 1.609344 km
- 5 km = 3.106856 miles
Weight
In the UK, body weight is often given in stones and pounds. One stone is 14 pounds, and one pound is 453.59237 grams.
- 1 kg = 2.204623 lb
- 1 st = 6.350293 kg
- 1 oz = 28.34952 g
- 100 g = 3.527396 oz
Volume: UK and US measures
| Measure | UK | US |
|---|---|---|
| Teaspoon | 5 ml | 4.928922 ml |
| Tablespoon | 15 ml | 14.78676 ml |
| Cup | 250 ml | 236.5882 ml |
| Fluid ounce | 28.41306 ml | 29.57353 ml |
| Pint | 568.2613 ml | 473.1765 ml |
| Gallon | 4.54609 litres | 3.785412 litres |
UK spoons and cups are the metric measures used in modern UK recipes and measuring sets.
Grams to cups for baking
Cups measure volume, so how many grams fit in one depends on the ingredient – a cup of sugar weighs over half as much again as a cup of flour. Choose “Cooking” above and pick an ingredient to convert between weight and volume. These are averages: how you fill the cup makes a difference, so use scales when accuracy matters.
| Ingredient | 1 US cup | 100 g |
|---|---|---|
| Plain flour | about 120 g | 0.8333333 US cups |
| Caster sugar | about 190 g | 0.5263158 US cups |
| Granulated sugar | about 198 g | 0.5050505 US cups |
| Butter | about 227 g | 0.4405286 US cups |
| Rice (long-grain, uncooked) | about 198 g | 0.5050505 US cups |
| Water | about 236.5882 g | 0.4226753 US cups |
Weights per cup from King Arthur Baking’s ingredient weight chart (flour spooned and levelled). Water is 1 g per ml.
Temperature
Temperature scales don’t just multiply – they start from different zero points. To go from Celsius to Fahrenheit, multiply by 9/5 and add 32; to go back, subtract 32 and multiply by 5/9. Kelvin starts at absolute zero, −273.15 °C. Negative temperatures work as normal.
- 0 °C = 32 °F (water freezes)
- 37 °C = 98.6 °F (body temperature)
- 180 °C = 356 °F (moderate oven)
- -40 °C = -40 °F (where the scales meet)
Area
Floor space is often quoted in square feet and land in acres or hectares. Remember that area units scale by the square: a square metre is 10.76 square feet, not 3.28.
- 1 m² = 10.76391 sq ft
- 1 acre = 4,046.856 m²
- 1 ha = 2.471054 acres
Working out a discount or a price per square metre? Try the percentage calculator or the VAT calculator.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54. The inch has been defined as 25.4 mm since 1959, so 1 in = 2.54 cm and 1 cm = 0.3937008 in.
How do I convert stone to kilograms?
One stone is 14 pounds, which is 6.35029318 kg. Multiply stone by 6.35 for a quick answer: for example, 11 st = 69.85322 kg.
Is a UK pint the same as a US pint?
No. A UK (imperial) pint is 568 ml and a US pint is 473 ml, about 20% smaller. UK and US gallons and fluid ounces differ too, so choose the right one for your recipe or label.
How many grams are in a cup?
It depends on the ingredient, because a cup measures volume, not weight. A US cup of plain flour weighs about 120 g, but a cup of granulated sugar is about 198 g and a cup of water 237 g. Choose “Cooking” and pick your ingredient for a closer answer.
What’s the difference between a UK cup and a US cup?
Modern UK recipes use a 250 ml metric cup, while US recipes use a 236.6 ml cup. UK teaspoons and tablespoons are 5 ml and 15 ml; US ones are very slightly smaller.
How do I convert Celsius to Fahrenheit?
Multiply by 9, divide by 5, then add 32. For example, 20 °C = 68 °F and 180 °C = 356 °F (a typical oven temperature).
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