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Unit conversion tables

The factor for all 207 conversions on the site, grouped by what is being measured. Read the answer straight off the table, or open a pair for the formula, a worked example, a reference table of common values and a converter that takes any number.

One conversion is missing from this page on purpose. Cups to grams has no factor at all — a cup is a volume and a gram is a mass, and only the ingredient connects them — so it lives in its own chart.

Length and distance

Convert any length or distance →

Metric and US customary length. The inch is defined as exactly 2.54 cm, so every metric-to-imperial length factor below is exact rather than measured.

Length and distance conversions and their factors
ConversionFactor
Centimeters to Feet1 cm = 0.032808 ft
Centimeters to Inches1 cm = 0.393701 in
Centimeters to Meters1 cm = 0.01 m
Centimeters to Millimeters1 cm = 10 mm
Feet to Centimeters1 ft = 30.48 cm
Feet to Inches1 ft = 12 in
Feet to Kilometers1 ft = 0.000305 km
Feet to Meters1 ft = 0.3048 m
Feet to Miles1 ft = 0.000189 mi
Feet to Millimeters1 ft = 304.8 mm
Feet to Yards1 ft = 0.333333 yd
Inches to Centimeters1 in = 2.54 cm
Inches to Feet1 in = 0.083333 ft
Inches to Meters1 in = 0.0254 m
Inches to Millimeters1 in = 25.4 mm
Inches to Yards1 in = 0.027778 yd
Kilometers to Feet1 km = 3,280.84 ft
Kilometers to Meters1 km = 1,000 m
Kilometers to Miles1 km = 0.621371 mi
Kilometers to Nautical Miles1 km = 0.539957 nmi
Meters to Centimeters1 m = 100 cm
Meters to Feet1 m = 3.2808 ft
Meters to Inches1 m = 39.3701 in
Meters to Kilometers1 m = 0.001 km
Meters to Miles1 m = 0.000621 mi
Meters to Millimeters1 m = 1,000 mm
Meters to Yards1 m = 1.0936 yd
Miles to Feet1 mi = 5,280 ft
Miles to Kilometers1 mi = 1.6093 km
Miles to Meters1 mi = 1,609.34 m
Miles to Nautical Miles1 mi = 0.868976 nmi
Miles to Yards1 mi = 1,760 yd
Millimeters to Centimeters1 mm = 0.1 cm
Millimeters to Feet1 mm = 0.003281 ft
Millimeters to Inches1 mm = 0.03937 in
Millimeters to Meters1 mm = 0.001 m
Nautical Miles to Kilometers1 nmi = 1.852 km
Nautical Miles to Miles1 nmi = 1.1508 mi
Yards to Feet1 yd = 3 ft
Yards to Inches1 yd = 36 in
Yards to Meters1 yd = 0.9144 m
Yards to Miles1 yd = 0.000568 mi

Weight and mass

Convert any weight →

Ounces here are avoirdupois (28.35 g), the ones used for food and freight — not the troy ounce used for gold. “Ton” means the metric tonne of 1,000 kg; the US short ton has its own pages.

Weight and mass conversions and their factors
ConversionFactor
Grams to Kilograms1 g = 0.001 kg
Grams to Milligrams1 g = 1,000 mg
Grams to Ounces1 g = 0.035274 oz
Grams to Pounds1 g = 0.002205 lb
Kilograms to Grams1 kg = 1,000 g
Kilograms to Metric Tons1 kg = 0.001 t
Kilograms to Milligrams1 kg = 1,000,000 mg
Kilograms to Ounces1 kg = 35.274 oz
Kilograms to Pounds1 kg = 2.2046 lb
Kilograms to Stone1 kg = 0.157473 st
Kilograms to US Short Tons1 kg = 0.001102 ton
Metric Tons to Kilograms1 t = 1,000 kg
Metric Tons to Pounds1 t = 2,204.62 lb
Metric Tons to US Short Tons1 t = 1.1023 ton
Milligrams to Grams1 mg = 0.001 g
Milligrams to Kilograms1 mg = 0.000001 kg
Ounces to Grams1 oz = 28.3495 g
Ounces to Kilograms1 oz = 0.02835 kg
Ounces to Pounds1 oz = 0.0625 lb
Pounds to Grams1 lb = 453.592 g
Pounds to Kilograms1 lb = 0.453592 kg
Pounds to Metric Tons1 lb = 0.000454 t
Pounds to Ounces1 lb = 16 oz
Pounds to Stone1 lb = 0.071429 st
Pounds to US Short Tons1 lb = 0.0005 ton
Stone to Kilograms1 st = 6.3503 kg
Stone to Pounds1 st = 14 lb
US Short Tons to Kilograms1 ton = 907.185 kg
US Short Tons to Metric Tons1 ton = 0.907185 t
US Short Tons to Pounds1 ton = 2,000 lb

Volume and capacity

Convert any volume →

Gallons, quarts, pints, cups and fluid ounces are US customary. Imperial (UK) measures are larger — a UK gallon is 4.546 L against the US 3.785 L — so British recipes and fuel figures will not match.

Volume and capacity conversions and their factors
ConversionFactor
Cubic Feet to Cubic Meters1 ft³ = 0.028317 m³
Cubic Feet to Cubic Yards1 ft³ = 0.037037 yd³
Cubic Feet to Gallons1 ft³ = 7.4805 gal
Cubic Feet to Liters1 ft³ = 28.3168 L
Cubic Inches to Gallons1 in³ = 0.004329 gal
Cubic Inches to Milliliters1 in³ = 16.3871 mL
Cubic Meters to Cubic Feet1 m³ = 35.3147 ft³
Cubic Meters to Liters1 m³ = 1,000 L
Cubic Yards to Cubic Feet1 yd³ = 27 ft³
Cups to Fluid Ounces1 cup = 8 fl oz
Cups to Gallons1 cup = 0.0625 gal
Cups to Liters1 cup = 0.236588 L
Cups to Milliliters1 cup = 236.588 mL
Cups to Pints1 cup = 0.5 pt
Cups to Quarts1 cup = 0.25 qt
Cups to Tablespoons1 cup = 16 tbsp
Fluid Ounces to Cups1 fl oz = 0.125 cup
Fluid Ounces to Gallons1 fl oz = 0.007813 gal
Fluid Ounces to Liters1 fl oz = 0.029574 L
Fluid Ounces to Milliliters1 fl oz = 29.5735 mL
Fluid Ounces to Tablespoons1 fl oz = 2 tbsp
Gallons to Cubic Feet1 gal = 0.133681 ft³
Gallons to Cubic Inches1 gal = 231 in³
Gallons to Cups1 gal = 16 cup
Gallons to Fluid Ounces1 gal = 128 fl oz
Gallons to Liters1 gal = 3.7854 L
Gallons to Pints1 gal = 8 pt
Gallons to Quarts1 gal = 4 qt
Liters to Cubic Feet1 L = 0.035315 ft³
Liters to Cubic Meters1 L = 0.001 m³
Liters to Cups1 L = 4.2268 cup
Liters to Fluid Ounces1 L = 33.814 fl oz
Liters to Gallons1 L = 0.264172 gal
Liters to Milliliters1 L = 1,000 mL
Liters to Quarts1 L = 1.0567 qt
Milliliters to Cubic Inches1 mL = 0.061024 in³
Milliliters to Cups1 mL = 0.004227 cup
Milliliters to Fluid Ounces1 mL = 0.033814 fl oz
Milliliters to Liters1 mL = 0.001 L
Milliliters to Pints1 mL = 0.002113 pt
Milliliters to Tablespoons1 mL = 0.067628 tbsp
Milliliters to Teaspoons1 mL = 0.202884 tsp
Pints to Cups1 pt = 2 cup
Pints to Gallons1 pt = 0.125 gal
Pints to Milliliters1 pt = 473.176 mL
Pints to Quarts1 pt = 0.5 qt
Quarts to Cups1 qt = 4 cup
Quarts to Gallons1 qt = 0.25 gal
Quarts to Liters1 qt = 0.946353 L
Quarts to Pints1 qt = 2 pt
Tablespoons to Cups1 tbsp = 0.0625 cup
Tablespoons to Fluid Ounces1 tbsp = 0.5 fl oz
Tablespoons to Milliliters1 tbsp = 14.7868 mL
Tablespoons to Teaspoons1 tbsp = 3 tsp
Teaspoons to Milliliters1 tsp = 4.9289 mL
Teaspoons to Tablespoons1 tsp = 0.333333 tbsp

Area

Convert any area →

An acre is 43,560 ft² by definition and a hectare is exactly 10,000 m², which is why the acre-to-hectare factor is not a round number.

Area conversions and their factors
ConversionFactor
Acres to Hectares1 acre = 0.404686 ha
Acres to Square Feet1 acre = 43,560 ft²
Acres to Square Kilometers1 acre = 0.004047 km²
Acres to Square Meters1 acre = 4,046.86 m²
Acres to Square Miles1 acre = 0.001563 mi²
Hectares to Acres1 ha = 2.4711 acre
Hectares to Square Feet1 ha = 107,639 ft²
Hectares to Square Kilometers1 ha = 0.01 km²
Hectares to Square Meters1 ha = 10,000 m²
Square Centimeters to Square Inches1 cm² = 0.155 in²
Square Centimeters to Square Meters1 cm² = 0.0001 m²
Square Feet to Acres1 ft² = 0.000023 acre
Square Feet to Hectares1 ft² = 0.000009 ha
Square Feet to Square Inches1 ft² = 144 in²
Square Feet to Square Meters1 ft² = 0.092903 m²
Square Feet to Square Yards1 ft² = 0.111111 yd²
Square Inches to Square Centimeters1 in² = 6.4516 cm²
Square Inches to Square Feet1 in² = 0.006944 ft²
Square Kilometers to Acres1 km² = 247.105 acre
Square Kilometers to Hectares1 km² = 100 ha
Square Kilometers to Square Miles1 km² = 0.386102 mi²
Square Meters to Acres1 m² = 0.000247 acre
Square Meters to Hectares1 m² = 0.0001 ha
Square Meters to Square Centimeters1 m² = 10,000 cm²
Square Meters to Square Feet1 m² = 10.7639 ft²
Square Meters to Square Yards1 m² = 1.196 yd²
Square Miles to Acres1 mi² = 640 acre
Square Miles to Square Kilometers1 mi² = 2.59 km²
Square Yards to Square Feet1 yd² = 9 ft²
Square Yards to Square Meters1 yd² = 0.836127 m²

Temperature

Convert any temperature →

Temperature scales do not share a zero, so these convert with a formula rather than a single factor. There is no meaningful “1 °C in °F” — one degree of change is 1.8 °F, but the reading 1 °C is 33.8 °F.

Temperature conversions and their factors
ConversionFormula
Celsius to Fahrenheit°F = (°C × 9/5) + 32
Celsius to KelvinK = °C + 273.15
Fahrenheit to Celsius°C = (°F − 32) × 5/9
Fahrenheit to KelvinK = (°F − 32) × 5/9 + 273.15
Kelvin to Celsius°C = K − 273.15
Kelvin to Fahrenheit°F = (K − 273.15) × 9/5 + 32

Speed

Convert any speed →

Knots are nautical miles per hour, where a nautical mile is exactly 1,852 m — longer than the statute mile used on land.

Speed conversions and their factors
ConversionFactor
Feet Per Second to Meters Per Second1 ft/s = 0.3048 m/s
Feet Per Second to Miles Per Hour1 ft/s = 0.681818 mph
Kilometers Per Hour to Knots1 km/h = 0.539957 kn
Kilometers Per Hour to Meters Per Second1 km/h = 0.277778 m/s
Kilometers Per Hour to Miles Per Hour1 km/h = 0.621371 mph
Knots to Kilometers Per Hour1 kn = 1.852 km/h
Knots to Meters Per Second1 kn = 0.514444 m/s
Knots to Miles Per Hour1 kn = 1.1508 mph
Meters Per Second to Feet Per Second1 m/s = 3.2808 ft/s
Meters Per Second to Kilometers Per Hour1 m/s = 3.6 km/h
Meters Per Second to Knots1 m/s = 1.9438 kn
Meters Per Second to Miles Per Hour1 m/s = 2.2369 mph
Miles Per Hour to Feet Per Second1 mph = 1.4667 ft/s
Miles Per Hour to Kilometers Per Hour1 mph = 1.6093 km/h
Miles Per Hour to Knots1 mph = 0.868976 kn
Miles Per Hour to Meters Per Second1 mph = 0.44704 m/s

Data storage

Convert any file size →

KB, MB, GB and TB step by 1,000 here; the IEC units KiB, MiB, GiB and TiB step by 1,024. That gap is why a 1 TB drive shows as 931 GB in Windows.

Data storage conversions and their factors
ConversionFactor
Bits to Bytes1 bit = 0.125 B
Bytes to Bits1 B = 8 bit
Bytes to Kilobytes1 B = 0.001 KB
Bytes to Megabytes1 B = 0.000001 MB
Gibibytes to Gigabytes1 GiB = 1.0737 GB
Gibibytes to Mebibytes1 GiB = 1,024 MiB
Gibibytes to Tebibytes1 GiB = 0.000977 TiB
Gigabytes to Bytes1 GB = 1,000,000,000 B
Gigabytes to Gibibytes1 GB = 0.931323 GiB
Gigabytes to Megabytes1 GB = 1,000 MB
Gigabytes to Terabytes1 GB = 0.001 TB
Kibibytes to Kilobytes1 KiB = 1.024 KB
Kilobytes to Bytes1 KB = 1,000 B
Kilobytes to Kibibytes1 KB = 0.976563 KiB
Kilobytes to Megabytes1 KB = 0.001 MB
Mebibytes to Gibibytes1 MiB = 0.000977 GiB
Mebibytes to Megabytes1 MiB = 1.0486 MB
Megabytes to Bytes1 MB = 1,000,000 B
Megabytes to Gigabytes1 MB = 0.001 GB
Megabytes to Kilobytes1 MB = 1,000 KB
Megabytes to Mebibytes1 MB = 0.953674 MiB
Megabytes to Terabytes1 MB = 0.000001 TB
Tebibytes to Gibibytes1 TiB = 1,024 GiB
Tebibytes to Terabytes1 TiB = 1.0995 TB
Terabytes to Gigabytes1 TB = 1,000 GB
Terabytes to Megabytes1 TB = 1,000,000 MB
Terabytes to Tebibytes1 TB = 0.909495 TiB

Exchange rates

Not a fixed factor like the rest of this page — these move every working day, so each one is its own page carrying the European Central Bank’s reference rate for the day you read it.

More reference tables

The other two families of answered questions on the site, indexed the same way.