Metric to Imperial Conversion Cheat Sheet: Length, Weight, Temperature, Volume

Quick lookup table for the most common metric-to-imperial and imperial-to-metric conversions. The exact conversion factors are given — use these for precise calculations, or use the Unit Converter for automatic two-way conversion between any units.

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Length

Metric	Imperial	Exact factor
1 millimetre (mm)	0.03937 inches	× 0.03937
1 centimetre (cm)	0.3937 inches	× 0.3937
1 metre (m)	3.2808 feet	× 3.2808
1 metre (m)	1.0936 yards	× 1.0936
1 kilometre (km)	0.6214 miles	× 0.6214

Imperial	Metric	Exact factor
1 inch (in)	2.54 centimetres	× 2.54 (exact)
1 foot (ft)	30.48 centimetres	× 30.48 (exact)
1 yard (yd)	0.9144 metres	× 0.9144 (exact)
1 mile (mi)	1.6093 kilometres	× 1.6093

Useful quick references:

• 1 km ≈ 0.62 miles (or: multiply km by 0.6 for a fast estimate)
• 1 mile ≈ 1.6 km (or: multiply miles by 1.6)
• 1 foot = 12 inches; 1 yard = 3 feet; 1 mile = 5,280 feet
• A standard doorway is about 2 metres (6 feet 7 inches) high

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Weight and Mass

Metric	Imperial	Factor
1 gram (g)	0.03527 ounces	× 0.03527
100 grams	3.527 ounces	× 0.03527
1 kilogram (kg)	2.2046 pounds	× 2.2046
1 kilogram (kg)	35.27 ounces	× 35.274
1 metric tonne (t)	2,204.6 pounds	× 2204.6
1 metric tonne (t)	1.1023 short tons	× 1.1023

Imperial	Metric	Factor
1 ounce (oz)	28.35 grams	× 28.35
1 pound (lb)	453.6 grams	× 453.6
1 pound (lb)	0.4536 kilograms	× 0.4536
1 stone (st)	6.35 kilograms	× 6.35
1 short ton	907.2 kilograms	× 907.2

Useful quick references:

• 1 kg ≈ 2.2 lbs (precise: multiply by 2.205)
• 1 lb ≈ 0.45 kg (precise: multiply by 0.454)
• A US pound is 16 ounces; a UK stone is 14 pounds
• Body weight: 70 kg ≈ 154 lbs ≈ 11 stone

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Temperature

Temperature conversions require formulas, not simple multiplication factors:

To convert	Formula
Celsius → Fahrenheit	°F = (°C × 9/5) + 32
Fahrenheit → Celsius	°C = (°F − 32) × 5/9
Celsius → Kelvin	K = °C + 273.15
Kelvin → Celsius	°C = K − 273.15

Key reference points:

Description	Celsius	Fahrenheit	Kelvin
Water freezes	0°C	32°F	273.15 K
Room temperature	20–22°C	68–72°F	293–295 K
Body temperature	37°C	98.6°F	310 K
Water boils	100°C	212°F	373 K
Oven: moderate	180°C	356°F	453 K
Oven: hot	220°C	428°F	493 K

Quick mental shortcuts:

• To get approximate °F from °C: double the Celsius and add 30. (20°C → 70°F. Actual is 68°F — close enough for weather.)
• To get approximate °C from °F: subtract 30 and halve. (80°F → 25°C. Actual is 26.7°C.)

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Speed

Metric	Imperial	Factor
1 km/h	0.6214 mph	× 0.6214
1 m/s	2.237 mph	× 2.237
1 m/s	3.6 km/h	× 3.6

Imperial	Metric	Factor
1 mph	1.6093 km/h	× 1.6093
1 mph	0.4470 m/s	× 0.4470

Reference speeds:

• Walking: ~5 km/h (~3 mph)
• Cycling: ~20 km/h (~12 mph)
• City speed limit: 50 km/h = 31 mph
• Motorway: 100 km/h = 62 mph; 120 km/h = 75 mph

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Volume and Liquid Measure

Metric	Imperial (UK)	Imperial (US)
1 millilitre (mL)	0.0352 fl oz (UK)	0.0338 fl oz (US)
100 mL	3.52 fl oz (UK)	3.38 fl oz (US)
1 litre (L)	1.7598 pints (UK)	2.1134 pints (US)
1 litre (L)	0.2200 gallons (UK)	0.2642 gallons (US)

Note: UK and US fluid ounces, pints, and gallons are different. A UK pint is 568 mL; a US pint is 473 mL.

Cooking conversions (approximate):

Measure	Millilitres
1 teaspoon	5 mL
1 tablespoon	15 mL
1 fl oz (US)	30 mL
¼ cup (US)	60 mL
½ cup (US)	120 mL
1 cup (US)	240 mL
1 pint (US)	473 mL
1 quart (US)	946 mL
1 gallon (US)	3.785 litres

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Area

Metric	Imperial	Factor
1 cm²	0.155 sq in	× 0.155
1 m²	10.764 sq ft	× 10.764
1 m²	1.196 sq yd	× 1.196
1 hectare (ha)	2.471 acres	× 2.471
1 km²	0.3861 sq miles	× 0.3861

Imperial	Metric	Factor
1 sq inch	6.452 cm²	× 6.452
1 sq foot	0.0929 m²	× 0.0929
1 acre	4,047 m²	× 4046.9
1 acre	0.4047 hectares	× 0.4047
1 sq mile	2.59 km²	× 2.59

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FAQ

What's the easiest way to convert km to miles? Multiply by 0.6. For a more accurate result, multiply by 0.621. Quick mental check: 10 km ≈ 6 miles, 100 km ≈ 62 miles.

Is a US cup the same as a UK cup? Mostly — a US cup is 240 mL, a UK cup is 250 mL. The difference (4%) is small enough to ignore in most recipes. However, US and UK tablespoons and fluid ounces differ, so check if a recipe specifies the system.

What's the difference between a metric tonne and a short ton? A metric tonne is 1,000 kg (2,204.6 lbs). A US short ton is 2,000 lbs (907.2 kg). A UK long ton is 2,240 lbs (1,016 kg). When someone says "tonnes" in Australia, Canada, or Europe, they mean metric tonnes.

How do I convert Celsius to Fahrenheit quickly without a calculator? Multiply °C by 2 and add 30 for a close estimate. The exact formula is (°C × 9/5) + 32. The shortcut overestimates by about 2–3°F, which is fine for weather discussions but not precise enough for cooking.

What is a hectare and how big is it? One hectare is 10,000 square metres — a square 100m × 100m. It's approximately 2.47 acres. A standard soccer/football pitch (105m × 68m) is about 0.71 hectares. A city block in Manhattan is roughly 0.5 hectares.