Unit Converter (Metric system, US customary units, etc.) / Tool

Metric system

angstrom
nanometre
nm
micrometre
μm
millimetre
mm
centimetre
cm
metre
m
kilometre
km

United States customary units / Imperial units

inch
in
foot
ft
yard
yd
chain
ch
furlong
fur
mile
mi

Japanese units of measurement

sun
shaku
ken
chō
ri

Nautical

nautical mile
nm / M

This is a unit converter that runs in your browser. Interconvert metric, United States customary units / Imperial units, and other systems of units with other systems of units.

  • Entering a value in any unit will automatically convert it to another unit.
  • Rounded to the fourteenth decimal place.
  • A number with many digits may appear as 1e9. This is the computer’s exponential representation, where “e” is a power of 10.
    e.g. 1e3 = 103 = 1,000
    e.g. 1e-3 = 10-3 = 0.001
  • This tool does not check the lower limit, so even if it is less than 0 Kelvin, it will be converted without error. Please note.

Metric unit conversion

The metric system is a system of units based on the meter as a unit of length and the kilogram as a unit of mass.

UnitsSymbolsConversion
Nanometrenm10-9 m
Micrometreμm10-6 m
Millimetremm10-3 m
Centimetrecm10-2 m
Decimetredm10-1 m
Decametredam101 m
Hectometrehm102 m
Kilometrekm103 m
MegametreMm106 m
UnitsSymbolsConversion
Nanogramng10-9 g
Microgramμg10-6 g
Milligrammg10-3 g
Centigramcg10-2 g
Decigramdg10-1 g
Decagramdag101 g
Hectogramhg102 g
Kilogramkg103 g
Megagram
tonne
Mg
t
106 g

Non-SI unit of length: Nautical mile conversion

Historically, it was defined as the meridian arc length corresponding to one minute (1/60 of a degree) of latitude. Today the international nautical mile is defined as exactly 1,852 metres (6,076 ft; 1.151 mi).

1nm=1852m1nm = 1852m

Non-SI units of area: Hectare / Are conversion

One hectare is 10,000 square meters and one hectare is 100 square meters, but neither is an SI unit.

UnitsSymbolsConversion
Are
Square decametre
a
dam2
102 m2
Hectare
Square hectometre
ha
hm2
104 m2
Square kilometrekm2106 m2

Non-SI units of volume: Liter conversion

One liter is defined as the volume of a cube of 10 cm on each side (= 1dm3).

UnitsSymbolsConversionMetric conversion
MicroliterµL10−6 L1 mm3
MillilitermL10−3 L1 cm3
CentilitercL10−2 L101 cm3
DeciliterdL10−1 L102 cm3
LiterL100 L103 cm3 (1 dm3)
DecaliterdaL101 L104 cm4 (101 dm3)
HectoliterhL102 L105 cm5 (12 dm3)
KiloliterkL103 L1 m3
MegaliterML106 L103 m3

United States customary units / Imperial units conversion

The United States customary units / Imperial units is a system of units used mainly in the United States, with the yard as the basic unit of length and the pound as the basic unit of mass.

UnitsSymbolsConversionMetric conversion
Inchin25.4 mm
Footft12 in30.48 cm
Yardyd3 ft0.9144 m
Chainch22 yd20.1168 m
Furlongfur220 yd201.168 m
Milemi1760 yd1609.344 m
UnitsSymbolsConversionMetric conversion
Graingr0.06479891 g
Dramdr27 × 11/32 gr1.7718451953125 g
Ounceoz16 dr28.349523125 g
Poundlb16 oz0.45359237 kg
Hundredweight (US)cwtUS100 lb45.359237 kg
Ton (US)s.t.2000 lb907.18474 kg
Stone (UK)st14 lb6.35029318 kg
Quarter (UK)qtr28 lb12.70058636 kg
Hundredweight (UK)cwtUK112 lb50.80234544 kg
Ton (UK)l.t.2240 lb1016.0469088 kg

In addition, different units are used in the U.S. and the U.K. for volume.

Volume of liquids (US) conversion

UnitsSymbolsDefinitionsLiter
Fluid dram (US)fl.dr.1/8 fl.oz.3.6966911953125 mL
Fluid ounce (US)fl.oz.1/16 pt29.5735295625 mL
Pint (US)pt1/2 qt473.176473 mL
Quart (US)qt1/4 gal0.946352946 L
Gallon (US)gal231 cu.in.3.785411784 L
Oil barrelbbl158.987294928 L

※バレルは石油以外では定義が異なります。

Volume of liquids (UK) conversion

UnitsSymbolsDefinitionsLiter
Fluid dram (UK)fl.dr.1/8 fl.oz.3.5516328125 mL
Fluid ounce (UK)fl.oz.1/5 gal28.4130625 mL
Pint (UK)pt1/2 qt568.26125 mL
Quart (UK)qt1/4 gal1.1365225 L
Gallon (UK)gal4.54609 L

Japanese units of measurement (shaku–kan system) conversion

The shaku–kan system is a traditional Japanese units of measurement , with the basic unit being the shaku for length and the kan for mass.

  • Length: The basic unit is the “shaku (尺)”. 1 shaku is defined as 10/33 of a meter.
  • Mass: The basic unit is the “kan (貫)”. 1 kan is defined as 3.75 kg.
  • Area: The basic unit is the “tsubo (坪)”. 1 tsubo is defined as 400/121 of a m2.
  • Volume: The basic unit is the “shō (升)”. 1 shō is defined as 2401/1331000 of a m3.
UnitsConversionMetric conversion

sun
0.1尺1/33 m
(≈30.3030 mm)

shaku
10/33 m
(≈30.3030 cm)

10尺100/33 m
(≈3.03030 m)

ken
6尺60/33 m
(≈1.81818 m)

chō
60間1200/11 m
(≈109.09 m)

ri
36町43200/11 m
(≈3927.273 m)
UnitsConversionMetric conversion

momme
3.75 g

ryō
10匁37.5 g

kin
16両600 g

kan
100両3.75 kg
UnitsConversionMetric conversion

shaku
1/10合4/121 m2
(≈330.58 cm2)

1/10坪40/121 m2
(≈0.33058 m2)
坪/歩
tsubo
400/121 m2
(≈3.3058 m2)

se
30坪12000/121 m2
(≈99.174 m2)

tan
10畝120000/121 m2
(≈991.736 m2)

chō
10反1200000/121 m2
(≈9917.355 m2)
畳/帖
1.62 m2
UnitsConversionMetric conversion

shaku
1/10合≈18.039 mL

1/10升≈180.391 mL

shō
≈1.804 L
(2401/1331000 m3)

to
10升≈18.039 L

koku
10斗≈180.391 L

Unit of force conversion

The unit of force in the International System of Units (SI) is the newton.

UnitsSymbolsDefinitions
NewtonNThe force which gives a mass of 1 kg an acceleration of 1 m/s2.
DynedynThe force which gives a mass of 1 g an acceleration of 1 cm/s2.
Kilogram-forcekgfThe magnitude of the force exerted on a mass of 1 kg under normal gravity.
Pound-forcelbfEqual to the gravitational force exerted on a mass of 1 lb on the surface of Earth.
PoundalpdlDefined as the force necessary to accelerate 1 pound-mass at 1 ft/s2.

The conversion formula is as follows

1N=1kgm/s21 N = 1 kg·m/s^2

1dyn=105N1 dyn = 10^{-5} N

1kgf=9.80665N1 kgf = 9.80665 N

1lbf=4.4482216152605N1 lbf = 4.4482216152605 N

1pdl=0.138254954376N1 pdl = 0.138254954376 N

Unit of pressure conversion

The unit of force in the International System of Units (SI) is the pascal.

UnitsSymbolsDefinitions
PascalPa1 Pa is the pressure exerted by a force of magnitude 1 N perpendicularly upon an area of 1 m2.
BarbarEqual to 100 kPa.
Standard atmosphereatmInternational standard for atmospheric pressure.
Technical atmosphereatEqual to 1 kgf/cm2.
TorrTorr1/760 of standard atmosphere.
Millimetre of mercurymmHgSame as tor.
Meter of watermH2OWater pressure at 1 m depth.
Inch of waterinH2OWater pressure at 1 in depth
Pound per square inchpsiPressure or stress exerting a force of 1 N per 1 sq.in.

The conversion formula is as follows

1bar=105Pa=100kPa1 bar = 10^5 Pa = 100 kPa

1atm=101325Pa1 atm = 101325 Pa

1at=98066.5Pa1 at = 98066.5 Pa

1Torr=1mmHg=1760atm=101325760Pa133.322Pa1 Torr = 1 mmHg = {\dfrac {1}{760}} atm = {\dfrac {101325}{760}} Pa \approx 133.322 Pa

1mH2O=102cmH2O=103mmH2O=9806.65Pa1 mH_2O = 10^2 cmH_2O = 10^3 mmH_2O = 9806.65 Pa

1inH2O=112ftH2O=249.0899Pa1 inH_2O = {\dfrac {1}{12}} ftH_2O = 249.0899 Pa

1psi=6894.76Pa1 psi = 6894.76 Pa

Unit of energy conversion

The unit of force in the International System of Units (SI) is the joule.

UnitsSymbolsDefinitions
JouleJWork done when a force of 1 N moves an object 1 m.
ErgergWork done when a force of 1 dyn moves an object 1 cm.
Kilogram-forcekgf·mWork done when a force of 1 kgf moves an object 1 m.
Foot-poundalft·pdlWork done when a force of 1 pdl moves an object 1 ft.
Foot-poundft·lbfWork done when a force of 1 lbf moves an object 1 ft.
Kilowatt-hourkW·h1000 times more work at a power rate of 1 W per hour.
(3600 times that of J)
CaloriecalHeat to raise the temperature of 1 g of water by 1 °C.
British thermal unitBtuHeat to raise the temperature of 1 lb of water by 1 °C.
ElectronvoltBtuKinetic energy gained by an electron by passing a potential difference of 1 V in vacuum.
TNT equivalenttExplosive power of 1 ton of TNT.

The conversion formula is as follows

1erg=107J1 erg = 10^{-7} J

1calth=4.184J1 cal_{th} = 4.184 J

1calIT=4.1868J1 cal_{IT} = 4.1868 J

1kgfm=9.80665J1 kgf·m = 9.80665 J

1ftpdl=0.0421401100938048J1 ft·pdl = 0.0421401100938048 J

1ftlbf=1.3558179483314004J1 ft·lbf = 1.3558179483314004 J

1kWh=3.6×106J=3.6MJ1 kW·h = 3.6 \times 10^6 J = 3.6 MJ

1Btu=1055.05585262J1 Btu = 1055.05585262 J

1eV=1.602176634×1019J1 eV = 1.602176634 \times 10^{-19} J

1t=4.184×109J1 t = 4.184 \times 10^9 J

Unit of temperature conversion

The unit of force in the International System of Units (SI) is the kelvin.

UnitsSymbolsDefinitions
KelvinK1/100 of the temperature difference between the boiling and freezing points of water.
Celsius°CKelvin - 273.15
Fahrenheit°FThe freezing point of fresh water is 32 degrees, the boiling point is 212 degrees, and the interval between them is divided into 180 equal parts to make 1 degree.
Rankine°RA unit of temperature in the same temperature interval as Fahrenheit, with absolute zero being 0.
Delisle°DeUnit of boiling point of water is 0 degrees and freezing point is 150 degrees.
Newton°NUnit where the temperature when snow melts is 0 degrees and the temperature when water boils is 33 degrees.
Réaumur°RéA unit of temperature that is rarely used today.
Rømer°RøA unit of temperature that is rarely used today.

The conversion formula is as follows

0K=Absolute zero0 K = \text{Absolute zero}

[°C]=[K]273.15[°C] = [K] - 273.15

[°F]=[K]×95459.67[°F] = [K] \times {\dfrac {9}{5}} - 459.67

[°F]=[°C]×95+32[°F] = [°C] \times {\dfrac {9}{5}} + 32

[°R]=[°K]×95[°R] = [°K] \times {\dfrac {9}{5}}

[°De]=(100[°C])×32[°De] = (100 - [°C]) \times {\dfrac {3}{2}}

[°N]=[°C]×33100[°N] = [°C] \times {\dfrac {33}{100}}

[°Reˊ]=[°C]×45\text{[°Ré]} = [°C] \times {\dfrac {4}{5}}

[°Rø]=[°C]×2140+7.5\text{[°Rø]} = [°C] \times {\dfrac {21}{40}} + 7.5

Unit of time conversion

The unit of force in the International System of Units (SI) is the seconds.

UnitsConverted valueUnitsConverted value
1 year365 days1 day24 hours
1 month30 days1 hour60 minutes
1 week7 days1 minutes60 seconds

Unit of tatami mats conversion

Jō (帖, 畳) is a unit of measurement used to express the floor area of a room.

Jō (帖)

“畳” varies in size, but “帖” is clearly defined as 1.62 square meters.

1=1.62m21\text{帖} = 1.62 m^2

Jō (畳)

There are multiple types of “畳” dimensions, and the area varies depending on which dimension “畳” is based on. There seem to be two reasons for the creation of multiple types.

  1. The standard 1間 (ken) dimension varies from period to period and region to region.
  2. Whether tatami split (based on tatami) or pillar split (based on pillar) varies by period and region.
NameSplit1間SizeArea
KyōmaTatami split6尺3寸3尺1寸5分×6尺3寸≈1.82405 m2
ChūkyōmaTatami split6尺3尺×6尺≈1.6562 m2
EdomaPillar split6尺≈2尺9寸×5尺8寸≈1.5488 m2
Danchima-5尺6寸2尺8寸×5尺6寸≈1.445 m2
6-2 ma-6尺2寸3尺1寸×6尺2寸≈1.7672 m2
6-1 ma-6尺1寸3尺5分×6尺1寸≈1.71125 m2

Unit of bit/byte conversion

1byte=8bit1byte = 8bit

1KB=1024byte1KB = 1024byte

1MB=1024KB=10242byte1MB = 1024KB = 1024^2byte

1 KB is 1024 Bytes? or 1000 Bytes?

This tool converts 1 kilobyte (KB) to 1024 bytes.

But originally kilo is 10310^3. These are called metric prefixes.

Metric prefixNameBase 10
Kkilo10310^3 = 1,000
Mmega10610^6 = 1,000,000
Ggiga10910^9 = 1,000,000,000
Ttera101210^{12} = 1,000,000,000,000
Ppeta101510^{15} = 1,000,000,000,000,000
Eexa101810^{18} = 1,000,000,000,000,000,000
Zzetta102110^{21} = 1,000,000,000,000,000,000,000
Yyotta102410^{24} = 1,000,000,000,000,000,000,000,000

But since computers are binary numbers, 10n10^n is inconvenient.

1bit=21=21bit = 2^1 = 2
2bit=22=42bit = 2^2 = 4
3bit=23=83bit = 2^3 = 8

8bit=28=2568bit = 2^8 = 256
9bit=29=5129bit = 2^9 = 512
10bit=210=102410bit = 2^{10} = 1024

Therefore, the computer decided as follows.

  • KB: 1,024byte
  • MB: 1,024KB
  • GB: 1,024MB

But this conversion method is often confusing. It is recommended to use a binary prefix to ensure a distinction.

Binary prefixNameBase 10
Kikibi2102^{10} = 1,024
Mimebi2202^{20} = 1,048,576
Gigibi2302^{30} = 1,073,741,824
Titebi2402^{40} = 1,099,511,627,776
Pipebi2502^{50} = 1,125,899,906,842,624
Eiexbi2602^{60} = 1,152,921,504,606,846,976
Zizebi2702^{70} = 1,180,591,620,717,411,303,424
Yiyobi2802^{80} = 1,208,925,819,614,629,174,706,176