Unit conversions

1306 conversions across 16 families. Every factor comes from the defining standard, not from a rounded table — the inch is exactly 25.4 mm and an acre is exactly 43,560 square feet.

Concentration — 5 units, 20 pairs

Concentration units expressed in part per millions
Unit	In part per millions	Convert to
per cent (%)	10000	‰ppm ppb ppt
per mille (‰)	1000	%ppm ppb ppt
part per million (ppm)	1	%‰ppb ppt
part per billion (ppb)	0.001	%‰ppm ppt
part per trillion (ppt)	0.000001	%‰ppm ppb

Length — 13 units, 156 pairs

Length units expressed in meters
Unit	In meters	Convert to
inch (in)	0.0254	ft yd mi mm dm cm m km nmi µm nm thou
foot (ft)	0.3048	in yd mi mm dm cm m km nmi µm nm thou
yard (yd)	0.9144	in ft mi mm dm cm m km nmi µm nm thou
mile (mi)	1609.344	in ft yd mm dm cm m km nmi µm nm thou
millimeter (mm)	0.001	in ft yd mi dm cm m km nmi µm nm thou
decimetre (dm)	0.1	in ft yd mi mm cm m km nmi µm nm thou
centimeter (cm)	0.01	in ft yd mi mm dm m km nmi µm nm thou
meter (m)	1	in ft yd mi mm dm cm km nmi µm nm thou
kilometer (km)	1000	in ft yd mi mm dm cm m nmi µm nm thou
nautical mile (nmi)	1852	in ft yd mi mm dm cm m km µm nm thou
micrometer (µm)	0.000001	in ft yd mi mm dm cm m km nmi nm thou
nanometer (nm)	1e-9	in ft yd mi mm dm cm m km nmi µm thou
thou (thou)	0.0000254	in ft yd mi mm dm cm m km nmi µm nm

Weight — 15 units, 210 pairs

Weight units expressed in kilograms
Unit	In kilograms	Convert to
ounce (oz)	0.028349523125	lb st ton mcg mg cg g kg slug t ct ozt gr LT
pound (lb)	0.45359237	oz st ton mcg mg cg g kg slug t ct ozt gr LT
stone (st)	6.35029318	oz lb ton mcg mg cg g kg slug t ct ozt gr LT
US ton (ton)	907.18474	oz lb st mcg mg cg g kg slug t ct ozt gr LT
microgram (mcg)	1e-9	oz lb st ton mg cg g kg slug t ct ozt gr LT
milligram (mg)	0.000001	oz lb st ton mcg cg g kg slug t ct ozt gr LT
centigram (cg)	0.00001	oz lb st ton mcg mg g kg slug t ct ozt gr LT
gram (g)	0.001	oz lb st ton mcg mg cg kg slug t ct ozt gr LT
kilogram (kg)	1	oz lb st ton mcg mg cg g slug t ct ozt gr LT
slug (slug)	14.593902937206364	oz lb st ton mcg mg cg g kg t ct ozt gr LT
tonne (t)	1000	oz lb st ton mcg mg cg g kg slug ct ozt gr LT
carat (ct)	0.0002	oz lb st ton mcg mg cg g kg slug t ozt gr LT
troy ounce (ozt)	0.0311034768	oz lb st ton mcg mg cg g kg slug t ct gr LT
grain (gr)	0.00006479891	oz lb st ton mcg mg cg g kg slug t ct ozt LT
long ton (LT)	1016.0469088	oz lb st ton mcg mg cg g kg slug t ct ozt gr

Volume — 20 units, 380 pairs

Volume units expressed in liters
Unit	In liters	Convert to
US teaspoon (tsp)	0.00492892159375	tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
US tablespoon (tbsp)	0.01478676478125	tsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
US fluid ounce (fl oz)	0.0295735295625	tsp tbsp cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
US cup (cup)	0.2365882365	tsp tbsp fl oz pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
US pint (pt)	0.473176473	tsp tbsp fl oz cup qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
US quart (qt)	0.946352946	tsp tbsp fl oz cup pt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
US gallon (gal)	3.785411784	tsp tbsp fl oz cup pt qt ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
milliliter (ml)	0.001	tsp tbsp fl oz cup pt qt gal L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
liter (L)	1	tsp tbsp fl oz cup pt qt gal ml gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
imperial gallon (gal (UK))	4.54609	tsp tbsp fl oz cup pt qt gal ml L qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
imperial quart (qt (UK))	1.1365225	tsp tbsp fl oz cup pt qt gal ml L gal (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
imperial pint (pt (UK))	0.56826125	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
imperial fluid ounce (fl oz (UK))	0.0284130625	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)gi (UK)mm³ cm³ in³ ft³ yd³ m³
imperial gill (gi (UK))	0.1420653125	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)mm³ cm³ in³ ft³ yd³ m³
cubic millimetre (mm³)	0.000001	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)cm³ in³ ft³ yd³ m³
cubic centimetre (cm³)	0.001	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ in³ ft³ yd³ m³
cubic inch (in³)	0.016387064	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ ft³ yd³ m³
cubic foot (ft³)	28.316846592	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ yd³ m³
cubic yard (yd³)	764.554857984	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ m³
cubic metre (m³)	1000	tsp tbsp fl oz cup pt qt gal ml L gal (UK)qt (UK)pt (UK)fl oz (UK)gi (UK)mm³ cm³ in³ ft³ yd³

Area — 10 units, 90 pairs

Area units expressed in square meters
Unit	In square meters	Convert to
square inch (sq in)	0.00064516	sq ft sq yd ac m² mm² cm² km² mi² ha
square foot (sq ft)	0.09290304	sq in sq yd ac m² mm² cm² km² mi² ha
square yard (sq yd)	0.83612736	sq in sq ft ac m² mm² cm² km² mi² ha
acre (ac)	4046.8564224	sq in sq ft sq yd m² mm² cm² km² mi² ha
square meter (m²)	1	sq in sq ft sq yd ac mm² cm² km² mi² ha
square millimetre (mm²)	0.000001	sq in sq ft sq yd ac m² cm² km² mi² ha
square centimetre (cm²)	0.0001	sq in sq ft sq yd ac m² mm² km² mi² ha
square kilometre (km²)	1000000	sq in sq ft sq yd ac m² mm² cm² mi² ha
square mile (mi²)	2589988.110336	sq in sq ft sq yd ac m² mm² cm² km² ha
hectare (ha)	10000	sq in sq ft sq yd ac m² mm² cm² km² mi²

Speed — 5 units, 20 pairs

Speed units expressed in meter per seconds
Unit	In meter per seconds	Convert to
meter per second (m/s)	1	km/h mph kn ft/s
kilometer per hour (km/h)	0.2777777777777778	m/s mph kn ft/s
mile per hour (mph)	0.44704	m/s km/h kn ft/s
knot (kn)	0.5144444444444445	m/s km/h mph ft/s
foot per second (ft/s)	0.3048	m/s km/h mph kn

Data — 8 units, 56 pairs

Data units expressed in bytes
Unit	In bytes	Convert to
byte (B)	1	kB MB GB TB KiB MiB GiB
kilobyte (kB)	1000	B MB GB TB KiB MiB GiB
megabyte (MB)	1000000	B kB GB TB KiB MiB GiB
gigabyte (GB)	1000000000	B kB MB TB KiB MiB GiB
terabyte (TB)	1000000000000	B kB MB GB KiB MiB GiB
kibibyte (KiB)	1024	B kB MB GB TB MiB GiB
mebibyte (MiB)	1048576	B kB MB GB TB KiB GiB
gibibyte (GiB)	1073741824	B kB MB GB TB KiB MiB

Time — 9 units, 72 pairs

Time units expressed in seconds
Unit	In seconds	Convert to
microsecond (µs)	0.000001	ms s min h d wk mo yr
millisecond (ms)	0.001	µs s min h d wk mo yr
second (s)	1	µs ms min h d wk mo yr
minute (min)	60	µs ms s h d wk mo yr
hour (h)	3600	µs ms s min d wk mo yr
day (d)	86400	µs ms s min h wk mo yr
week (wk)	604800	µs ms s min h d mo yr
month (mo)	2629746	µs ms s min h d wk yr
year (yr)	31556952	µs ms s min h d wk mo

Pressure — 8 units, 56 pairs

Pressure units expressed in pascals
Unit	In pascals	Convert to
pound per square inch (psi)	6894.757293168361	bar Pa kPa MPa atm Torr inHg
bar (bar)	100000	psi Pa kPa MPa atm Torr inHg
pascal (Pa)	1	psi bar kPa MPa atm Torr inHg
kilopascal (kPa)	1000	psi bar Pa MPa atm Torr inHg
megapascal (MPa)	1000000	psi bar Pa kPa atm Torr inHg
standard atmosphere (atm)	101325	psi bar Pa kPa MPa Torr inHg
torr (Torr)	133.32236842105263	psi bar Pa kPa MPa atm inHg
inch of mercury (inHg)	3386.389	psi bar Pa kPa MPa atm Torr

Power — 8 units, 56 pairs

Power units expressed in watts
Unit	In watts	Convert to
horsepower (hp)	745.6998715822702	PS W kW mW MW TR BTU/h
metric horsepower (PS)	735.49875	hp W kW mW MW TR BTU/h
watt (W)	1	hp PS kW mW MW TR BTU/h
kilowatt (kW)	1000	hp PS W mW MW TR BTU/h
milliwatt (mW)	0.001	hp PS W kW MW TR BTU/h
megawatt (MW)	1000000	hp PS W kW mW TR BTU/h
ton of refrigeration (TR)	3516.852842066667	hp PS W kW mW MW BTU/h
BTU per hour (BTU/h)	0.2930710701722222	hp PS W kW mW MW TR

Energy — 8 units, 56 pairs

Energy units expressed in joules
Unit	In joules	Convert to
joule (J)	1	kJ cal kcal Wh kWh BTU ft·lbf
kilojoule (kJ)	1000	J cal kcal Wh kWh BTU ft·lbf
calorie (cal)	4.184	J kJ kcal Wh kWh BTU ft·lbf
kilocalorie (kcal)	4184	J kJ cal Wh kWh BTU ft·lbf
watt-hour (Wh)	3600	J kJ cal kcal kWh BTU ft·lbf
kilowatt-hour (kWh)	3600000	J kJ cal kcal Wh BTU ft·lbf
British thermal unit (BTU)	1055.05585262	J kJ cal kcal Wh kWh ft·lbf
foot-pound (ft·lbf)	1.3558179483314003	J kJ cal kcal Wh kWh BTU

Force — 6 units, 30 pairs

Force units expressed in newtons
Unit	In newtons	Convert to
newton (N)	1	kN lbf kgf ozf dyn
kilonewton (kN)	1000	N lbf kgf ozf dyn
pound-force (lbf)	4.4482216152605	N kN kgf ozf dyn
kilogram-force (kgf)	9.80665	N kN lbf ozf dyn
ounce-force (ozf)	0.2780138509537812	N kN lbf kgf dyn
dyne (dyn)	0.00001	N kN lbf kgf ozf

Torque — 5 units, 20 pairs

Torque units expressed in newton meters
Unit	In newton meters	Convert to
pound-foot (lbf·ft)	1.3558179483314003	lbf·in N·m N·cm kgf·m
pound-inch (lbf·in)	0.1129848290276167	lbf·ft N·m N·cm kgf·m
newton meter (N·m)	1	lbf·ft lbf·in N·cm kgf·m
newton centimeter (N·cm)	0.01	lbf·ft lbf·in N·m kgf·m
kilogram-force meter (kgf·m)	9.80665	lbf·ft lbf·in N·m N·cm

Angle — 7 units, 42 pairs

Angle units expressed in radians
Unit	In radians	Convert to
radian (rad)	1	°gon ′″turn mrad
degree (°)	0.017453292519943295	rad gon ′″turn mrad
gradian (gon)	0.015707963267948967	rad °′″turn mrad
arcminute (′)	0.0002908882086657216	rad °gon ″turn mrad
arcsecond (″)	0.00000484813681109536	rad °gon ′turn mrad
turn (turn)	6.283185307179586	rad °gon ′″mrad
milliradian (mrad)	0.001	rad °gon ′″turn

Frequency — 6 units, 30 pairs

Frequency units expressed in hertzs
Unit	In hertzs	Convert to
hertz (Hz)	1	kHz MHz GHz THz rpm
kilohertz (kHz)	1000	Hz MHz GHz THz rpm
megahertz (MHz)	1000000	Hz kHz GHz THz rpm
gigahertz (GHz)	1000000000	Hz kHz MHz THz rpm
terahertz (THz)	1000000000000	Hz kHz MHz GHz rpm
revolution per minute (rpm)	0.016666666666666666	Hz kHz MHz GHz THz

Temperature — 4 units, 12 pairs

Temperature units expressed in kelvins
Unit	In kelvins	Convert to
degree Celsius (°C)	zero at 273.15 K	°F K °R
degree Fahrenheit (°F)	zero at 255.3722222222222 K	°C K °R
kelvin (K)	zero at 0 K	°C °F °R
degree Rankine (°R)	zero at 0 K	°C °F K