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Metric conversion factors

These are some metric conversion factors. To a large extent this table has been superseded by our metric converter applet. But here they are anyway…

Parsec
3.0857e16
lengthToMetres
Astronomical and large scale units 1 parsec = 3.0857 × 10^16 m
Lightyear
9.4607e15
lengthToMetres
Astronomical and large scale units 1 lightyear = 9.4607 × 10^15 m
Astronomical Unit (AU)
1.49598e11
lengthToMetres
Astronomical and large scale units 1 AU = average Earth-Sun distance in metres
Gigametre (Gm)
1e9
lengthToMetres
Astronomical and large scale units 1 GM - 10^9 metres
Megametre (Mm)
1e6
lengthToMetres
Astronomical and large scale units 1 Mm = 1,000,000 metres
Kilometre (km)
1e3
lengthToMetres
Astronomical and large scale units 1 km = 1000 metres
Metre (m)
1
lengthToMetres
Astronomical and large scale units Base SI unit for length
Decimetre (dm)
0.1
lengthToMetres
Sub-metric units using SI prefixes 1 dm = 0.1 m
Centimetre (cm)
0.01
lengthToMetres
Sub-metric units using SI prefixes 1 cm = 0.01 m
Millimetre (mm)
0.001
lengthToMetres
Sub-metric units using SI prefixes 1 mm = 0.001 m
Micrometre (µm)
1e-6
lengthToMetres
Sub-metric units using SI prefixes 1 micrometre = 10^-6 m
Nanometre (nm)
1e-9
lengthToMetres
Sub-metric units using SI prefixes 1 nanometre = 10^-9 m
Angstrom (Å)
1e-10
lengthToMetres
Sub-metric units using SI prefixes 1 Å = 10^-10 m
Picometre (pm)
1e-12
lengthToMetres
Sub-metric units using SI prefixes 1 pm = 10^-12 m
Femtometre (fm)
1e-15
lengthToMetres
Sub-metric units using SI prefixes 1 fm = 10^-15 m
International Nautical Mile
1852
lengthToMetres
Nautical and imperial miles variations 1 naut. mile = 1852 m (standard)
Imperial Nautical Mile
1853.18
lengthToMetres
Slight variant of nautical mile
Imperial Sea Mile
1828.8
lengthToMetres
Historic/less common nautical mile
Statute Mile
1609.34
lengthToMetres
1 mile (UK/US statute) = 1609.34 m
Furlong
201.168
lengthToMetres
1 furlong = 201.168 m
Chain
20.1168
lengthToMetres
1 chain = 20.1168 m
Fathom
1.8288
lengthToMetres
1 fathom = 1.8288 m (depth measurement)
Rod | Pole | Perch
5.0292
lengthToMetres
1 rod/pole/perch = 5.0292 m
Yard (yd)
0.9144
lengthToMetres
1 yard = 0.9144 m
Foot (ft)
0.3048
lengthToMetres
1 foot = 0.3048 m
Cubit
0.4572
lengthToMetres
(0.0254*18) metres
Inch (in)
0.0254
lengthToMetres
1 inch = 0.0254 m
Thou (mil)
2.54 × 10-5
lengthToMetres
1 thou (mil) = 0.0000254 m (thousandth of an inch)
Kilogram (kg)
1
massToKg
SI base unit of mass
Tonne (T)
1000
massToKg
1 tonne = 1000 kg
Gram (g)
0.001
massToKg
1 g = 0.001 kg
Milligram (mg)
1 × 10-6
massToKg
1 mg = 10^-6 kg
Microgram (µg)
1 × 10-9
massToKg
1 µg = 10^-9 kg
Carat (Ct)
0.0002
massToKg
1 carat = 0.2 g = 0.0002 kg
Grain (gr)
6.48 × 10-5
massToKg
1 grain = 64.79891 mg = 6.479891e-5 kg
Dalton (Da)
1.66053906660e-27
massToKg
atomic mass unit
Atomic Mass Unit (amu)
1.66053906660e-27
massToKg
same as Dalton
Planck Mass
2.176434e-8
massToKg
Planck mass in kg
Catty (HK | Malaysia | Singapore)
0.60479
massToKg
Approximate traditional catty
Catty (Mainland China - Jin)
0.5
massToKg
Mainland China jin
Imperial Hundredweight (CWT)
50.80234544
massToKg
112 lb = 50.80234544 kg
US Hundredweight
45.359237
massToKg
100 lb = 45.359237 kg
Stone
6.35029318
massToKg
14 lb = 6.35029318 kg
Pound (lb)
0.45359237
massToKg
1 lb = 0.45359237 kg
Ounce (oz)
0.0283495231
massToKg
1 oz = 28.3495231 g = 0.0283495231 kg
Thousandth Ounce (thou oz)
2.835 × 10-5
massToKg
1 mil oz = 0.0000283495231 kg
Imperial Ton
1016.0469088
massToKg
Long ton (2240 lb)
US Ton (short ton)
907.18474
massToKg
Short ton (2000 lb)
Troy Pound
0.3732417216
massToKg
1 troy lb = 373.2417216 g
Troy Ounce
0.0311034768
massToKg
1 troy oz = 31.1034768 g
Slug
14.5939029372
massToKg
Imperial slug = 14.5939029372 kg
Second (s)
1
timeToS
Base SI unit for time
Megasecond (Ms)
1000000
timeToS
1 Megasecond = 1,000,000 seconds
Kilosecond (ks)
1000
timeToS
1 Kilosecond = 1,000 seconds
Millisecond (ms)
0.001
timeToS
1 Millisecond = 0.001 seconds
Microsecond (µs)
1 × 10-6
timeToS
1 Microsecond = 0.000001 seconds
Nanosecond (ns)
1 × 10-9
timeToS
1 Nanosecond = 0.000000001 seconds
Century
3.156 × 109
timeToS
1 Century = 100 years ≈ 3.15576 × 10^9 seconds (assuming Julian year)
Decade
3.156 × 108
timeToS
1 Decade = 10 years ≈ 3.15576 × 10^8 seconds
Year (avg)
31557600
timeToS
Average year = 365.25 days ≈ 3.15576 × 10^7 seconds
Month (avg)
2629800
timeToS
Average month ≈ 30.44 days ≈ 2.6298 × 10^6 seconds
Week
604800
timeToS
1 Week = 7 days = 604800 seconds
Day
86400
timeToS
1 Day = 24 hours = 86400 seconds
Hour
3600
timeToS
1 Hour = 60 minutes = 3600 seconds
Minute
60
timeToS
1 Minute = 60 seconds
Joule (J)
1
energyToJoules
SI base unit for energy (kg·m²/s²)
Kilojoule (kJ)
1000
energyToJoules
1 kJ = 1000 J
Megajoule (MJ)
1000000
energyToJoules
1 MJ = 1,000,000 J
Gigajoule (GJ)
1 × 109
energyToJoules
1 GJ = 1,000,000,000 J
Calorie (cal)
4.184
energyToJoules
1 cal ~ heat to raise 1g water by 1°C
Kilocalorie (kcal)
4184
energyToJoules
1 kcal = 1000 cal
British Thermal Unit (BTU)
1055.06
energyToJoules
Approximate energy to heat 1 lb water up 1°F
Electronvolt (eV)
1.60218e-19
energyToJoules
Energy of particle with 1 volt potential difference
Watt-hour (Wh)
3600
energyToJoules
1 Wh = 3600 J (power*time: 1 watt over 1 hour)
Kilowatt-hour (kWh)
3600000
energyToJoules
1 kWh = 1000 Wh = 3.6 million Joules
Therm (US)
1.055 × 108
energyToJoules
US therm, natural gas energy approx 105.48 MJ
Therm (EC)
1.055 × 108
energyToJoules
European Community therm slight variation
Ton of TNT (t TNT)
4.184 × 109
energyToJoules
Explosive energy approx 4.184 GJ per ton
Horsepower-hour (hp·h)
2684519.54
energyToJoules
Mechanical power*time, 1 hp × 1 hour in J
Watt (W)
1
powerToWatts
SI base unit of power: 1 Watt = 1 Joule/second
Milliwatt (mW)
0.001
powerToWatts
1 milliwatt = 0.001 Watts
Kilowatt (kW)
1000
powerToWatts
1 kilowatt = 1000 Watts
Megawatt (MW)
1000000
powerToWatts
1 megawatt = 1,000,000 Watts
Gigawatt (GW)
1 × 109
powerToWatts
1 gigawatt = 1,000,000,000 Watts
Boiler Horsepower (hp (Boiler))
9809.5
powerToWatts
British boiler horsepower (1 hp ≈ 9809.5 W)
Electric Horsepower (hp (Electric))
746
powerToWatts
Electric horsepower (1 hp = 746 W)
Imperial Horsepower (hp (Imperial))
745.7
powerToWatts
Mechanical (imperial) horsepower (1 hp ≈ 745.7 W)
Metric Horsepower (hp (Metric))
735.5
powerToWatts
Metric horsepower (1 hp ≈ 735.5 W)
Water Horsepower (hp (Water))
745.7
powerToWatts
Water horsepower, similar to imperial
British Thermal Unit per Hour (BTU/h)
0.293071
powerToWatts
Heat flow power: 1 BTU/h ≈ 0.293071 W
Erg per second (erg/s)
1e-7
powerToWatts
Small physics energy unit; 1 erg/s = 10^-7 W
Foot-pound per minute (ft·lb/min)
0.022597
powerToWatts
Mechanical unit; 1 ft·lb/min ≈ 0.022597 W
Calorie per second (cal/s)
4.184
powerToWatts
Thermodynamic power; 1 cal/s ≈ 4.184 W
Ton of refrigeration (TR)
3516.85
powerToWatts
Cooling power unit; 1 TR ≈ 3516.85 W
Volt-amp (VA)
1
powerToWatts
Apparent power, equal to Watts for resistive loads
Horsepower (hp)
745.7
powerToWatts
Commonly used horsepower value in watts
Newton (N)
1
forceToNewtons
SI base unit of force
Kilonewton (kN)
1000
forceToNewtons
1000 newtons
Meganewton (MN)
1000000
forceToNewtons
1 million newtons
Kilogram-force (kgf)
9.80665
forceToNewtons
Also called kilopond, force exerted by 1 kg mass under gravity
Gram-force (gf)
0.00980665
forceToNewtons
Force exerted by 1 gram mass under gravity
Pound-Force (lbf)
4.4482216152605
forceToNewtons
Force exerted by 1 pound mass under gravity (avoirdupois)
Ounce-force (ozf)
0.2780139
forceToNewtons
Force exerted by 1 ounce mass under gravity
Ton-force (short) (tonf (US))
8896.443233
forceToNewtons
2000 lbf
Ton-force (long) (tonf (UK))
9964.016418
forceToNewtons
2240 lbf (Imperial ton)
Dyne
1 × 10-5
forceToNewtons
CGS unit: 1 dyne = 10^-5 newtons
Poundal (pdl)
0.138254954376
forceToNewtons
Imperial unit, force causing 1 lb to accelerate at 1 ft/s^2
Pascal (Pa)
1
pressureToPascals
SI base unit of pressure: Pascal (Pa) = Newton per square meter (N/m²)
Kilopascal (kPa)
1000
pressureToPascals
1 kPa = 1000 Pa
Hectopascal (hPa)
100
pressureToPascals
1 hPa = 100 Pa; also called millibar (mbar)
Megapascal (MPa)
1000000
pressureToPascals
1 MPa = 1,000,000 Pa
Atmosphere (atm)
101325
pressureToPascals
1 atm = 101,325 Pa (standard atmosphere)
Bar
100000
pressureToPascals
1 bar = 100 kPa = 100,000 Pa
Millibar (mbar)
100
pressureToPascals
1 mbar = 1 hPa = 100 Pa
Torr
133.322
pressureToPascals
1 torr ≈ 1 mmHg ≈ 133.322 Pa
Centimetre of Mercury (cmHg)
1333.22
pressureToPascals
10 × mmHg (1 cm Hg = 10 mmHg)
Millimetre of Mercury (mmHg)
133.322
pressureToPascals
Exact standard at 0 °C
Inch of Mercury (inHg)
3386.39
pressureToPascals
1 inHg ≈ 3386.39 Pa
Millimetre of Water (mmH2O)
9.80665
pressureToPascals
1 mm H₂O = 9.80665 Pa
Inch of Water (inH2O)
249.0889
pressureToPascals
1 in H₂O ≈ 249.089 Pa (at 4 °C)
Kilogram-force per square centimetre (kgf/cm²)
98066.5
pressureToPascals
1 kgf/cm² ≈ 98.0665 kPa
Pound per square inch (psi)
6894.76
pressureToPascals
1 psi = 1 lbf/in² = 6894.76 Pa
Pound per square foot (psf)
47.8803
pressureToPascals
1 psf = 1 lbf/ft² = 47.8803 Pa
Dyne per square centimetre (dyne/cm²)
0.1
pressureToPascals
1 dyne/cm² = 0.1 Pa
Radian (Rad)
1
angleToRad
SI base unit for angles
Degree (°)
0.017453292519943295
angleToRad
1 degree = π/180 radians
Gradian (Grad)
0.015707963267948967
angleToRad
1 grad = π/200 radians
Revolution (rev)
6.283185307179586
angleToRad
1 revolution = 2π radians
Minute of Arc (arcmin)
0.0002908882086657216
angleToRad
1 arcminute = π/(180*60) radians
Second of Arc (arcsec)
4.848 × 10-6
angleToRad
1 arcsecond = π/(180*3600) radians
Milliradian (mrad)
0.001
angleToRad
1 milliradian = 1/1000 radian ≈ 0.0573°
Military Mil (mil)
0.00098174770424681
angleToRad
1 mil = 2π/6400 radians ≈ 0.00098175 radians ≈ 0.05625°
Square Metre (m²)
1
areaToSquareMetres
SI base unit of area
Square Kilometre (km²)
1000000
areaToSquareMetres
1 sq km = 1,000,000 m²
Hectare (ha)
10000
areaToSquareMetres
1 hectare = 10,000 m²
Are
100
areaToSquareMetres
1 are = 100 m²
Square Centimetre (cm²)
0.0001
areaToSquareMetres
1 cm² = 0.0001 m²
Square Millimetre (mm²)
1 × 10-6
areaToSquareMetres
1 mm² = 0.000001 m²
Square Micron (μm²)
1 × 10-12
areaToSquareMetres
1 micron squared in m²
Square Nanometre (nm²)
1e-18
areaToSquareMetres
1 nanometre squared in m²
Square Mile (mi²)
2590000
areaToSquareMetres
1 mi = 1609.34 m, squared for area
Acre
4046.8564224
areaToSquareMetres
1 acre = 4046.8564224 m² (0.4047 ha)
Square Yard (yd²)
0.83612736
areaToSquareMetres
1 yd = 0.9144 m, squared for area
Square Foot (ft²)
0.09290304
areaToSquareMetres
1 ft = 0.3048 m, squared
Square Inch (in²)
0.00064516
areaToSquareMetres
1 in = 0.0254 m, squared
Cubic Metre (m³)
1
volumeToCubicMetres
Base SI unit for volume: (1 m)^3
Cubic Decimetre (dm³)
0.001
volumeToCubicMetres
1 dm = 0.1 m; (0.1)^3 = 0.001 m³
Litre (L)
0.001
volumeToCubicMetres
1 L = 1 dm³ = 0.001 m³
Centilitre (cL)
1 × 10-5
volumeToCubicMetres
1 cL = 10 cm³
Millilitre (mL)
1 × 10-6
volumeToCubicMetres
1 mL = 1 cm³ = (0.01 m)^3 = 1e-6 m³
Cubic Centimetre (cm³)
1 × 10-6
volumeToCubicMetres
1 cm = 0.01 m; (0.01)^3 = 1e-6 m³
Cubic Millimetre (mm³)
1e-9
volumeToCubicMetres
1 mm = 0.001 m; (0.001)^3 = 1e-9 m³
Cubic Micrometre (µm³)
1e-18
volumeToCubicMetres
1 µm = 1e-6 m; (1e-6)^3 = 1e-18 m³
Cubic Yard (yd³)
0.764554858
volumeToCubicMetres
1 yd = 0.9144 m; (0.9144)^3 ≈ 0.7645549 m³
Cubic Foot (ft³)
0.0283168466
volumeToCubicMetres
1 ft = 0.3048 m; (0.3048)^3 ≈ 0.0283168 m³
Cubic Inch (in³)
1.639 × 10-5
volumeToCubicMetres
1 in = 0.0254 m; (0.0254)^3 = 1.6387e-5 m³
Imperial Bushel
0.03523907
volumeToCubicMetres
Standard imperial bushel volume in cubic metres
Imperial Gallon
0.00454609
volumeToCubicMetres
1 Imperial gallon = 4.54609 L = 0.00454609 m³
Imperial Quart
0.0011365225
volumeToCubicMetres
1 Quart = 1/4 Imperial gallon
Imperial Pint
0.00056826125
volumeToCubicMetres
1 Pint = 1/8 Imperial gallon
Imperial Cup
0.0002841306
volumeToCubicMetres
1 Cup = 1/16 Imperial gallon
Imperial Gill (Teacup)
0.0001420653
volumeToCubicMetres
1 Gill = 1/32 Imperial gallon
Imperial Fluid Ounce (fl oz)
2.841306e-5
volumeToCubicMetres
1 fl oz = 1/160 Imperial gallon
Imperial Tablespoon
1.775816e-5
volumeToCubicMetres
1 Tablespoon = 1/320 Imperial gallon
Imperial Teaspoon
5.919388e-6
volumeToCubicMetres
1 Teaspoon = 1/960 Imperial gallon
Metric Teaspoon
5e-6
volumeToCubicMetres
Exactly 5 millilitres
Metric Tablespoon
15e-6
volumeToCubicMetres
3 Metric teaspoons, 15 millilitres
Metric Cup
250e-6
volumeToCubicMetres
Standard metric cup = 250 millilitres
Australian Metric Tablespoon
20e-6
volumeToCubicMetres
Approximately 20 millilitres
Australian Metric Teaspoon
6.67e-6
volumeToCubicMetres
Approximately 6.67 millilitres
US Oil Barrel (bo)
0.158987294928
volumeToCubicMetres
1 Oil barrel ≈ 42 US gallons = 0.159 m³
US Bushel
0.03523907
volumeToCubicMetres
Same as Imperial bushel (approx.)
US Gallon
0.003785411784
volumeToCubicMetres
1 US gallon = 3.78541 litres
US Quart
0.000946352946
volumeToCubicMetres
1 Quart = 1/4 US gallon
US Pint
0.000473176473
volumeToCubicMetres
1 Pint = 1/8 US gallon
US Cup
0.0002365882365
volumeToCubicMetres
1 Cup = 1/16 US gallon
US Gill
0.00011829411825
volumeToCubicMetres
1 Gill = 1/32 US gallon
US Fluid Ounce (fl oz)
2.957353e-5
volumeToCubicMetres
1 fl oz = 1/128 US gallon
US Tablespoon
1.4786765e-5
volumeToCubicMetres
1 Tablespoon = 1/64 US fl oz
US Bar Tablespoon
1.4786765e-5
volumeToCubicMetres
Bar variant same as US Tablespoon
US Teaspoon
4.9289216e-6
volumeToCubicMetres
1 Teaspoon = 1/192 US fl oz
US Bar Teaspoon
4.9289216e-6
volumeToCubicMetres
Bar variant same as US Teaspoon
Tun of Beer
0.9814731
volumeToCubicMetres
216 Imperial Gallons
Butt of Beer
0.49073655
volumeToCubicMetres
108 (1⁄2 tun)
Hogshead of Beer
0.245368275
volumeToCubicMetres
54 Imperial Gallons (1⁄4 tun)
Barrel of Beer
0.1635797167
volumeToCubicMetres
36 Imperial Gallons (1⁄6 tun)
Kilderkin of Beer
0.08178985835
volumeToCubicMetres
18 Imperial Gallons (1⁄2 barrel)
Firkin of Beer
0.040894929175
volumeToCubicMetres
9 Imperial Gallons (1⁄4 barrel)
Pin of Beer
0.020447464588
volumeToCubicMetres
4.5 Imperial Gallons (1⁄2 firkin)
Metre per Second (m/s)
1
speedToMs
SI base unit for speed
Kilometre per Hour (km/h)
0.2777777778
speedToMs
1 km/h = 1000m / 3600s = 10/36 m/s
Centimetre per Second (cm/s)
0.01
speedToMs
1 cm/s = 0.01 m/s
Millimetre per Second (mm/s)
0.001
speedToMs
1 mm/s = 0.001 m/s
Mile per Hour (mph)
0.44704
speedToMs
1 mile = 1609.34m, per hour
Foot per Second (ft/s)
0.3048
speedToMs
1 foot = 0.3048 m
Inch per Second (in/s)
0.0254
speedToMs
1 inch = 0.0254 m
Knot (nautical mile per hour)
0.514444
speedToMs
1 knot = 1852m / 3600s
Mach (speed of sound at sea level)
340.29
speedToMs
Approx speed of sound at sea level, 20°C
Light Speed (c)
2.998 × 108
speedToMs
Speed of light in vacuum (m/s)
Furlong per Fortnight
0.00016630952
speedToMs
(220 * 0.9144)/(3600*24*14)
Metre per Second Squared (m/s²)
1
accelerationToMs2
SI base unit of acceleration: metre per second squared (m/s²)
Foot per Second Squared (ft/s²)
0.3048
accelerationToMs2
Imperial unit: foot per second squared
Standard Gravity (g)
9.80665
accelerationToMs2
Exact nominal acceleration due to Earth's gravity at sea level
Galileo (Gal)
0.01
accelerationToMs2
CGS unit of acceleration
Kilometre per Hour Squared (km/h²)
7.716 × 10-5
accelerationToMs2
Kilometre per hour squared used in vehicle acceleration measurements
Mile per Hour Squared (mph²)
0.0001241777778
accelerationToMs2
Mile per hour squared used in traffic engineering and vehicle performance
Byte
1
digitalToBytes
Base unit: Byte (B) is the standard unit of digital information storage
Kilobyte (kB)
1000
digitalToBytes
1 kB = 1000 bytes
Megabyte (MB)
1000000
digitalToBytes
1 MB = 1,000,000 bytes (decimal)
Gigabyte (GB)
1 × 109
digitalToBytes
1 GB = 1,000,000,000 bytes
Terabyte (TB)
1 × 1012
digitalToBytes
1 TB = 10^12 bytes
Petabyte (PB)
1 × 1015
digitalToBytes
1 PB = 10^15 bytes
Kibibyte (KiB)
1024
digitalToBytes
1 KiB = 1024 bytes (2^10)
Mebibyte (MiB)
1048576
digitalToBytes
1 MiB = 1,048,576 bytes (2^20)
Gibibyte (GiB)
1.074 × 109
digitalToBytes
1 GiB = 1,073,741,824 bytes (2^30)
Tebibyte (TiB)
1.1 × 1012
digitalToBytes
1 TiB = 1,099,511,627,776 bytes (2^40)
Pebibyte (PiB)
1.126 × 1015
digitalToBytes
1 PiB = 1,125,899,906,842,624 bytes (2^50)
Bit
0.125
digitalToBytes
1 bit = 1/8 byte
Kilobit (kb)
125
digitalToBytes
1 kb = 1000 bits = 125 bytes
Megabit (Mb)
125000
digitalToBytes
1 Mb = 1,000,000 bits = 125,000 bytes
Gigabit (Gb)
1.25 × 108
digitalToBytes
1 Gb = 1,000,000,000 bits = 125,000,000 bytes
Terabit (Tb)
1.25 × 1011
digitalToBytes
1 Tb = 10^12 bits = 125,000,000,000 bytes
Petabit (Pb)
1.25 × 1014
digitalToBytes
1 Pb = 10^15 bits
Kibibit (kib)
128
digitalToBytes
1024 bits = 128 bytes
Mebibit (Mib)
131072
digitalToBytes
1,048,576 bits = 131,072 bytes
Gibibit (Gib)
1.342 × 108
digitalToBytes
1,073,741,824 bits = 134,217,728 bytes
Tebibit (Tib)
1.374 × 1011
digitalToBytes
1,099,511,627,776 bits = 137,438,953,472 bytes
Pebibit (Pib)
1.441 × 1017
digitalToBytes
1,125,899,906,842,624 bits

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