Printable cheat sheets

Length

Base unit meter (m) · dimension L

Unit	Symbol	Value in m
Kilometer	km	1000
Meter	m	1
Centimeter	cm	0.01
Millimeter	mm	0.001
Micrometer	µm	0.000001
Nanometer	nm	0.000000001
Inch	in	0.0254
Foot	ft	0.3048
Yard	yd	0.9144
Mile	mi	1609.344
Nautical mile	nmi	1852
Ångström	Å	0.0000000001
Astronomical unit	au	149597870700
Light-year	ly	9460730473000000

Weight & mass

Base unit kilogram (kg) · dimension M

Unit	Symbol	Value in kg
Kilogram	kg	1
Gram	g	0.001
Milligram	mg	0.000001
Microgram	µg	0.000000001
Tonne	t	1000
Carat	ct	0.0002
Pound	lb	0.45359237
Ounce	oz	0.02834952313
Stone	st	6.35029318
Short ton (US)	tn	907.18474
Troy ounce	ozt	0.0311034768
Atomic mass unit	u	0.000000000000000000000000001660539069

Temperature

Base unit kelvin (K) · dimension Θ

Unit	Symbol	Value in K
Kelvin	K	1
Rankine	°R	0.5555555556

Area

Base unit square meter (m²) · dimension L²

Unit	Symbol	Value in m²
Square kilometer	km²	1000000
Square meter	m²	1
Square centimeter	cm²	0.0001
Square millimeter	mm²	0.000001
Hectare	ha	10000
Square inch	in²	0.00064516
Square foot	ft²	0.09290304
Square mile	mi²	2589988.11
Acre	ac	4046.856422

Volume

Base unit cubic meter (m³) · dimension L³

Unit	Symbol	Value in m³
Cubic meter	m³	1
Cubic centimeter	cm³	0.000001
Liter	L	0.001
Milliliter	mL	0.000001
Gallon (US)	gal	0.003785411784
Quart (US)	qt	0.000946352946
Pint (US)	pt	0.000473176473
Cup (US customary)	cup	0.0002365882365
Fluid ounce (US)	fl oz	0.00002957352956
Tablespoon (US)	tbsp	0.00001478676478
Teaspoon (US)	tsp	0.000004928921594
Barrel (oil)	bbl	0.1589872949
Gallon (imperial)	gal (imp)	0.00454609
Pint (imperial)	pt (imp)	0.00056826125

Time

Base unit second (s) · dimension T

Unit	Symbol	Value in s
Second	s	1
Millisecond	ms	0.001
Microsecond	µs	0.000001
Nanosecond	ns	0.000000001
Minute	min	60
Hour	h	3600
Day	d	86400
Week	wk	604800
Month (average)	mo	2629746
Year (Gregorian)	yr	31556952

Speed

Base unit meter per second (m/s) · dimension L T⁻¹

Unit	Symbol	Value in m/s
Meter per second	m/s	1
Kilometer per hour	km/h	0.2777777778
Mile per hour	mph	0.44704
Foot per second	ft/s	0.3048
Knot	kn	0.5144444444
Mach (sea level)	Ma	340.29
Speed of light	c	299792458

Angle

Base unit radian (rad) · dimension 1

Unit	Symbol	Value in rad
Radian	rad	1
Milliradian	mrad	0.001
Degree	°	0.01745329252
Arcminute	′	0.0002908882087
Arcsecond	″	0.000004848136811
Gradian	gon	0.01570796327
Turn	tr	6.283185307

Digital storage

Base unit bit (b) · dimension 1

Unit	Symbol	Value in b
Bit	b	1
Byte	B	8
Kilobyte	kB	8000
Megabyte	MB	8000000
Gigabyte	GB	8000000000
Terabyte	TB	8000000000000
Kibibyte	KiB	8192
Mebibyte	MiB	8388608
Gibibyte	GiB	8589934592
Tebibyte	TiB	8796093022000

Data transfer rate

Base unit bit per second (bit/s) · dimension T⁻¹

Unit	Symbol	Value in bit/s
Gigabit per second	Gbit/s	1000000000
Megabit per second	Mbit/s	1000000
Kilobit per second	kbit/s	1000
Bit per second	bit/s	1
Megabyte per second	MB/s	8000000
Kilobyte per second	kB/s	8000
Mebibyte per second	MiB/s	8388608

Force

Base unit newton (N) · dimension M L T⁻²

Unit	Symbol	Value in N
Kilonewton	kN	1000
Newton	N	1
Dyne	dyn	0.00001
Kilogram-force	kgf	9.80665
Pound-force	lbf	4.448221615
Kip	kip	4448.221615

Pressure & stress

Base unit pascal (Pa) · dimension M L⁻¹ T⁻²

Unit	Symbol	Value in Pa
Megapascal	MPa	1000000
Kilopascal	kPa	1000
Hectopascal	hPa	100
Pascal	Pa	1
Bar	bar	100000
Millibar	mbar	100
Atmosphere (standard)	atm	101325
Torr	Torr	133.3223684
Millimeter of mercury	mmHg	133.3223874
Inch of mercury	inHg	3386.38864
Pound per square inch	psi	6894.757293
Kilopound per square inch	ksi	6894757.293

Energy & work

Base unit joule (J) · dimension M L² T⁻²

Unit	Symbol	Value in J
Gigajoule	GJ	1000000000
Megajoule	MJ	1000000
Kilojoule	kJ	1000
Joule	J	1
Watt-hour	Wh	3600
Kilowatt-hour	kWh	3600000
Calorie (thermochemical)	cal	4.184
Kilocalorie	kcal	4184
British thermal unit	BTU	1055.055853
Therm (US)	thm	105480400
Electronvolt	eV	0.0000000000000000001602176634
Megaelectronvolt	MeV	0.0000000000001602176634
Erg	erg	0.0000001
Foot-pound	ft·lbf	1.355817948

Power

Base unit watt (W) · dimension M L² T⁻³

Unit	Symbol	Value in W
Gigawatt	GW	1000000000
Megawatt	MW	1000000
Kilowatt	kW	1000
Watt	W	1
Horsepower (mechanical)	hp	745.6998716
Horsepower (metric)	PS	735.49875
BTU per hour	BTU/h	0.2930710702
Ton of refrigeration	RT	3516.852842
Volt-ampere	VA	1
Kilovolt-ampere	kVA	1000

Torque

Base unit newton meter (N·m) · dimension M L² T⁻²

Unit	Symbol	Value in N·m
Newton meter	N·m	1
Kilonewton meter	kN·m	1000
Kilogram-force meter	kgf·m	9.80665
Pound-force foot	lbf·ft	1.355817948
Pound-force inch	lbf·in	0.112984829

Density

Base unit kilogram per cubic meter (kg/m³) · dimension M L⁻³

Unit	Symbol	Value in kg/m³
Kilogram per cubic meter	kg/m³	1
Gram per cubic centimeter	g/cm³	1000
Kilogram per liter	kg/L	1000
Gram per liter	g/L	1
Pound per cubic foot	lb/ft³	16.01846337
Pound per cubic inch	lb/in³	27679.90471
Pound per US gallon	lb/gal	119.8264273

Acceleration

Base unit meter per second squared (m/s²) · dimension L T⁻²

Unit	Symbol	Value in m/s²
Meter per second squared	m/s²	1
Standard gravity	g	9.80665
Gal	Gal	0.01
Foot per second squared	ft/s²	0.3048
Kilometer per hour per second	km/h/s	0.2777777778
Mile per hour per second	mph/s	0.44704

Frequency

Base unit hertz (Hz) · dimension T⁻¹

Unit	Symbol	Value in Hz
Gigahertz	GHz	1000000000
Megahertz	MHz	1000000
Kilohertz	kHz	1000
Hertz	Hz	1
Revolution per minute	rpm	0.01666666667
Beat per minute	bpm	0.01666666667

Angular velocity

Base unit radian per second (rad/s) · dimension T⁻¹

Unit	Symbol	Value in rad/s
Radian per second	rad/s	1
Degree per second	°/s	0.01745329252
Revolution per minute	rpm	0.1047197551
Revolution per second	rev/s	6.283185307

Volumetric flow

Base unit cubic meter per second (m³/s) · dimension L³ T⁻¹

Unit	Symbol	Value in m³/s
Cubic meter per second	m³/s	1
Cubic meter per hour	m³/h	0.0002777777778
Liter per second	L/s	0.001
Liter per minute	L/min	0.00001666666667
Cubic foot per second	ft³/s	0.02831684659
Cubic foot per minute	CFM	0.0004719474432
US gallon per minute	GPM	0.0000630901964
Barrel per day	bbl/d	0.000001840130728

Mass flow

Base unit kilogram per second (kg/s) · dimension M T⁻¹

Unit	Symbol	Value in kg/s
Kilogram per second	kg/s	1
Kilogram per hour	kg/h	0.0002777777778
Gram per second	g/s	0.001
Tonne per hour	t/h	0.2777777778
Pound per second	lb/s	0.45359237
Pound per hour	lb/h	0.0001259978806

Fuel economy

Base unit kilometer per liter (km/L) · dimension L⁻²

Unit	Symbol	Value in km/L
Kilometer per liter	km/L	1
Liter per 100 km	L/100 km	100
Mile per US gallon	mpg (US)	0.4251437074
Mile per imperial gallon	mpg (imp)	0.3540061899

Specific volume

Base unit cubic meter per kilogram (m³/kg) · dimension M⁻¹ L³

Unit	Symbol	Value in m³/kg
Cubic meter per kilogram	m³/kg	1
Liter per kilogram	L/kg	0.001
Cubic centimeter per gram	cm³/g	0.001
Cubic foot per pound	ft³/lb	0.06242796058

Surface tension

Base unit newton per meter (N/m) · dimension M T⁻²

Unit	Symbol	Value in N/m
Newton per meter	N/m	1
Millinewton per meter	mN/m	0.001
Dyne per centimeter	dyn/cm	0.001
Pound-force per inch	lbf/in	175.1268352

Momentum & impulse

Base unit kilogram meter per second (kg·m/s) · dimension M L T⁻¹

Unit	Symbol	Value in kg·m/s
Kilogram meter per second	kg·m/s	1
Newton second	N·s	1
Gram centimeter per second	g·cm/s	0.00001
Pound foot per second	lb·ft/s	0.1382549544

Thermal conductivity

Base unit watt per meter kelvin (W/(m·K)) · dimension M L T⁻³ Θ⁻¹

Unit	Symbol	Value in W/(m·K)
Watt per meter kelvin	W/(m·K)	1
Milliwatt per meter kelvin	mW/(m·K)	0.001
Kilocalorie per hour meter °C	kcal/(h·m·°C)	1.162222222
BTU per hour foot °F	BTU/(h·ft·°F)	1.730734666
BTU inch per hour ft² °F	BTU·in/(h·ft²·°F)	0.1442278889

Specific heat capacity

Base unit joule per kilogram kelvin (J/(kg·K)) · dimension L² T⁻² Θ⁻¹

Unit	Symbol	Value in J/(kg·K)
Joule per kilogram kelvin	J/(kg·K)	1
Kilojoule per kilogram kelvin	kJ/(kg·K)	1000
Calorie per gram °C	cal/(g·°C)	4184
BTU per pound °F	BTU/(lb·°F)	4186.8

Heat flux density

Base unit watt per square meter (W/m²) · dimension M T⁻³

Unit	Symbol	Value in W/m²
Watt per square meter	W/m²	1
Kilowatt per square meter	kW/m²	1000
BTU per hour square foot	BTU/(h·ft²)	3.154590745
Kilocalorie per hour square meter	kcal/(h·m²)	1.162222222

Thermal expansion

Base unit per kelvin (1/K) · dimension Θ⁻¹

Unit	Symbol	Value in 1/K
Per kelvin	1/K	1
Per degree Celsius	1/°C	1
Per degree Fahrenheit	1/°F	1.8
Parts per million per kelvin	ppm/K	0.000001

Thermal resistance

Base unit kelvin per watt (K/W) · dimension M⁻¹ L⁻² T³ Θ

Unit	Symbol	Value in K/W
Kelvin per watt	K/W	1
Degree Celsius per watt	°C/W	1
°F hour per BTU	°F·h/BTU	1.895634241

R-value & insulance

Base unit rsi (m²·k/w) (m²·K/W) · dimension M⁻¹ T³ Θ

Unit	Symbol	Value in m²·K/W
RSI (m²·K/W)	m²·K/W	1
R-value (US)	ft²·°F·h/BTU	0.1761101837
Clo	clo	0.155
Tog	tog	0.1

Heat transfer coefficient

Base unit watt per square meter kelvin (W/(m²·K)) · dimension M T⁻³ Θ⁻¹

Unit	Symbol	Value in W/(m²·K)
Watt per square meter kelvin	W/(m²·K)	1
BTU per hour ft² °F	BTU/(h·ft²·°F)	5.678263341
Kilocalorie per hour m² °C	kcal/(h·m²·°C)	1.162222222

Dynamic viscosity

Base unit pascal second (Pa·s) · dimension M L⁻¹ T⁻¹

Unit	Symbol	Value in Pa·s
Pascal second	Pa·s	1
Millipascal second	mPa·s	0.001
Poise	P	0.1
Centipoise	cP	0.001
Pound-force second per ft²	lbf·s/ft²	47.88025898

Kinematic viscosity

Base unit square meter per second (m²/s) · dimension L² T⁻¹

Unit	Symbol	Value in m²/s
Square meter per second	m²/s	1
Square millimeter per second	mm²/s	0.000001
Stokes	St	0.0001
Centistokes	cSt	0.000001
Square foot per second	ft²/s	0.09290304

Amount of substance

Base unit mole (mol) · dimension N

Unit	Symbol	Value in mol
Kilomole	kmol	1000
Mole	mol	1
Millimole	mmol	0.001
Micromole	µmol	0.000001
Nanomole	nmol	0.000000001
Pound-mole	lb-mol	453.59237
Entity	ent	0.000000000000000000000001660539067

Molar mass

Base unit kilogram per mole (kg/mol) · dimension M N⁻¹

Unit	Symbol	Value in kg/mol
Kilogram per mole	kg/mol	1
Gram per mole	g/mol	0.001
Kilogram per kilomole	kg/kmol	0.001
Pound per pound-mole	lb/lb-mol	0.001

Molar concentration

Base unit mole per cubic meter (mol/m³) · dimension N L⁻³

Unit	Symbol	Value in mol/m³
Mole per cubic meter	mol/m³	1
Molar	M	1000
Millimolar	mM	1
Micromolar	µM	0.001
Nanomolar	nM	0.000001

Parts & percentages

Base unit fraction (1) · dimension 1

Unit	Symbol	Value in 1
Fraction	1	1
Percent	%	0.01
Per mille	‰	0.001
Per myriad	‱	0.0001
Parts per million	ppm	0.000001
Parts per billion	ppb	0.000000001
Parts per trillion	ppt	0.000000000001

Electric current

Base unit ampere (A) · dimension I

Unit	Symbol	Value in A
Kiloampere	kA	1000
Ampere	A	1
Milliampere	mA	0.001
Microampere	µA	0.000001
Nanoampere	nA	0.000000001
Abampere	abA	10

Electric charge

Base unit coulomb (C) · dimension I T

Unit	Symbol	Value in C
Coulomb	C	1
Millicoulomb	mC	0.001
Microcoulomb	µC	0.000001
Nanocoulomb	nC	0.000000001
Ampere-hour	Ah	3600
Milliampere-hour	mAh	3.6
Faraday	F	96485.33212
Elementary charge	e	0.0000000000000000001602176634

Voltage

Base unit volt (V) · dimension M L² T⁻³ I⁻¹

Unit	Symbol	Value in V
Megavolt	MV	1000000
Kilovolt	kV	1000
Volt	V	1
Millivolt	mV	0.001
Microvolt	µV	0.000001
Statvolt	statV	299.792458

Resistance

Base unit ohm (Ω) · dimension M L² T⁻³ I⁻²

Unit	Symbol	Value in Ω
Megaohm	MΩ	1000000
Kiloohm	kΩ	1000
Ohm	Ω	1
Milliohm	mΩ	0.001

Resistivity

Base unit ohm meter (Ω·m) · dimension M L³ T⁻³ I⁻²

Unit	Symbol	Value in Ω·m
Ohm meter	Ω·m	1
Ohm centimeter	Ω·cm	0.01
Microohm centimeter	µΩ·cm	0.00000001
Ohm mm² per meter	Ω·mm²/m	0.000001
Ohm circular mil per foot	Ω·cmil/ft	0.000000001662426113

Conductance

Base unit siemens (S) · dimension M⁻¹ L⁻² T³ I²

Unit	Symbol	Value in S
Siemens	S	1
Millisiemens	mS	0.001
Microsiemens	µS	0.000001
Mho	℧	1

Electrical conductivity

Base unit siemens per meter (S/m) · dimension M⁻¹ L⁻³ T³ I²

Unit	Symbol	Value in S/m
Siemens per meter	S/m	1
Siemens per centimeter	S/cm	100
Millisiemens per centimeter	mS/cm	0.1
Microsiemens per centimeter	µS/cm	0.0001
Megasiemens per meter	MS/m	1000000

Capacitance

Base unit farad (F) · dimension M⁻¹ L⁻² T⁴ I²

Unit	Symbol	Value in F
Farad	F	1
Millifarad	mF	0.001
Microfarad	µF	0.000001
Nanofarad	nF	0.000000001
Picofarad	pF	0.000000000001

Inductance

Base unit henry (H) · dimension M L² T⁻² I⁻²

Unit	Symbol	Value in H
Henry	H	1
Millihenry	mH	0.001
Microhenry	µH	0.000001
Nanohenry	nH	0.000000001

Electric field strength

Base unit volt per meter (V/m) · dimension M L T⁻³ I⁻¹

Unit	Symbol	Value in V/m
Volt per meter	V/m	1
Kilovolt per meter	kV/m	1000
Megavolt per meter	MV/m	1000000
Volt per centimeter	V/cm	100
Volt per millimeter	V/mm	1000
Volt per mil	V/mil	39370.07874

Magnetic flux

Base unit weber (Wb) · dimension M L² T⁻² I⁻¹

Unit	Symbol	Value in Wb
Weber	Wb	1
Milliweber	mWb	0.001
Microweber	µWb	0.000001
Maxwell	Mx	0.00000001
Volt second	V·s	1

Magnetic flux density

Base unit tesla (T) · dimension M T⁻² I⁻¹

Unit	Symbol	Value in T
Tesla	T	1
Millitesla	mT	0.001
Microtesla	µT	0.000001
Gauss	G	0.0001
Milligauss	mG	0.0000001
Gamma	γ	0.000000001

Magnetic field strength

Base unit ampere per meter (A/m) · dimension I L⁻¹

Unit	Symbol	Value in A/m
Ampere per meter	A/m	1
Kiloampere per meter	kA/m	1000
Ampere per centimeter	A/cm	100
Oersted	Oe	79.57747155
Kilooersted	kOe	79577.47155

Magnetomotive force

Base unit ampere-turn (At) · dimension I

Unit	Symbol	Value in At
Ampere-turn	At	1
Kiloampere-turn	kAt	1000
Gilbert	Gb	0.7957747155

Luminous intensity

Base unit candela (cd) · dimension J

Unit	Symbol	Value in cd
Kilocandela	kcd	1000
Candela	cd	1
Millicandela	mcd	0.001
Candlepower	cp	0.981

Luminous flux

Base unit lumen (lm) · dimension J

Unit	Symbol	Value in lm
Kilolumen	klm	1000
Lumen	lm	1
Millilumen	mlm	0.001
Candela steradian	cd·sr	1

Illuminance

Base unit lux (lx) · dimension J L⁻²

Unit	Symbol	Value in lx
Kilolux	klx	1000
Lux	lx	1
Millilux	mlx	0.001
Foot-candle	fc	10.76391042
Phot	ph	10000

Luminance

Base unit candela per square meter (cd/m²) · dimension J L⁻²

Unit	Symbol	Value in cd/m²
Candela per square meter	cd/m²	1
Kilocandela per square meter	kcd/m²	1000
Candela per square centimeter	cd/cm²	10000
Candela per square inch	cd/in²	1550.0031
Lambert	L	3183.098862
Foot-lambert	fL	3.4262591

Radioactivity

Base unit becquerel (Bq) · dimension T⁻¹

Unit	Symbol	Value in Bq
Gigabecquerel	GBq	1000000000
Megabecquerel	MBq	1000000
Kilobecquerel	kBq	1000
Becquerel	Bq	1
Curie	Ci	37000000000
Millicurie	mCi	37000000
Microcurie	µCi	37000
Picocurie	pCi	0.037
Disintegration per minute	dpm	0.01666666667

Absorbed dose

Base unit gray (Gy) · dimension L² T⁻²

Unit	Symbol	Value in Gy
Gray	Gy	1
Milligray	mGy	0.001
Microgray	µGy	0.000001
Rad	rad	0.01
Millirad	mrad	0.00001

Equivalent dose

Base unit sievert (Sv) · dimension L² T⁻²

Unit	Symbol	Value in Sv
Sievert	Sv	1
Millisievert	mSv	0.001
Microsievert	µSv	0.000001
Rem	rem	0.01
Millirem	mrem	0.00001

Radiation exposure

Base unit coulomb per kilogram (C/kg) · dimension M⁻¹ T I

Unit	Symbol	Value in C/kg
Coulomb per kilogram	C/kg	1
Millicoulomb per kilogram	mC/kg	0.001
Roentgen	R	0.000258
Milliroentgen	mR	0.000000258

Pace

Base unit second per metre (s/m) · dimension T L⁻¹

Unit	Symbol	Value in s/m
Minute per kilometre	min/km	0.06
Minute per mile	min/mi	0.03728227153
Second per 100 metres	s/100 m	0.01
Minute per 100 metres	min/100 m	0.6
Minute per 100 yards	min/100 yd	0.656167979

Typography length

Base unit metre (m) · dimension L

Unit	Symbol	Value in m
Millimetre	mm	0.001
Inch	in	0.0254
CSS pixel	px	0.0002645833333
PostScript point	pt	0.0003527777778
Pica	pc	0.004233333333

Display resolution density

Base unit pixel per metre (px/m) · dimension L⁻¹

Unit	Symbol	Value in px/m
Pixel per centimetre	px/cm	100
Pixel per inch	ppi	39.37007874
CSS dots per pixel unit	dppx	3779.527559
CSS dots per centimetre	dpcm	100

Alcohol strength

Base unit volume fraction (v/v) · dimension 1

Unit	Symbol	Value in v/v
Percent alcohol by volume	% ABV	0.01
Degree Gay-Lussac	°GL	0.01
US proof	proof (US)	0.005
British proof (historic)	proof (UK)	0.005714285714

Household water hardness

Base unit milligram per litre as caco3 (mg/L CaCO₃) · dimension M L⁻³

Unit	Symbol	Value in mg/L CaCO₃
Milligram per litre as CaCO3	mg/L CaCO₃	1
Part per million as CaCO3	ppm CaCO₃	1
French degree	°fH	10
German degree	°dH	17.848
Grain per US gallon	gpg	17.11806105