How to Convert Common Units
Use the tables below to find common conversion factors for length, area, volume, energy, power, force, pressure, heat, electrical resistance, electrical currents,
capacitance, and magnetization. Conversions are displayed in both Imperial system formulas and metric system formulas.
| How to Convert: |
Equation: |
| Convert Angular Degrees to Radians (deg to rad) |
rad = deg X 0.01745 |
| Convert Radians to Angular Degrees (rad to deg) |
deg = rad X 57.30 |
Conversion Formulas for Area
| How to Convert: |
Equation: |
| Convert Square Inches to Square Centimeters (in2 to cm2) |
cm2 = in2 X 6.452 |
| Convery Square Feet to Square Meters (ft2 to m2) |
m2 = ft2 X 0.0929 |
| Convert Square Meters to Square Feet (m2 to ft2) |
ft2 = m2 X 10.76 |
| Convert Square Miles to Square Kilometers (km2 to mi2) |
km2 = mi2 X 2.59 |
| Convert Square Kilometers to Square Miles (km2 to mi2) |
mi2 = km2 X 0.3861 |
| Convert Acres to Square Feet (ac to ft2) |
ft2 = ac X 43560 |
| Convert Square Feet to Acres (ft2 to ac) |
ac = ft2 X 2.296 X 10‑5 |
| Convert Square Miles to Acers (m2 to ac) |
ac = mi2 X 640 |
| Convert Acers to Square Miles (ac to mi2) |
mi2 = ac X 1.562 X 10‑3 |
| Convert Square Inches to Circular Mils (in2 to cmil) |
cmil = in2 X 1.273 X 106 |
| Convert Circular Mils to Square Centimeters (cmil to cm2) |
cm2 = cmil X 5.067 X 10‑6 |
| Convert Circular Mils to Square Inches (cmil to in2) |
in2 = cmil X 0.7854 X 10‑6 |
| Convert Circular Mils to Square Mils (cmil to mil2) |
mil2 = cmil X 0.7854 |
| Convert Square Centimeters to Circular Mils (cm2 to cmil) |
cmil = cm2 X 1.973 X 105 |
| Convert Square Millimeters to Circular Mils (mm2 to cmil) |
cmil = mm2 X 1.973 X 103 |
| Convert Square Mils to Circular Mils (mil2 to cmil) |
cmil = mil2 X 1.273 |
Conversion Formulas for Capacitance
| How to Convert: |
Equation: |
| Convert Farads to Microfarads (F to μF) |
μF = F X 106 |
| Convert Microfarads to Farads (μF to F) |
F = μF X 10‑6 |
Conversion Formulas for Electrical Current
| How to Convert: |
Equation: |
| Convert Amperes per Square Centimeter to Amperes per Square Inch (A/cm2 to A/in2) |
A/in2 = A/cm2 X 6.452 |
| Convert Amperes per Square Inch to Amperes per Square Centimeter (A/in2 to A/cm2) |
A/cm2 = A/in2 X 0.155 |
| Convert Gilberts to Ampere‑Turns (Gb to At) |
At = Gb X 0.7958 |
| Convert Ampere‑Turns per Inch to Ampere‑Turns per Centimeter (At/in to At/cm) |
At/cm = At/in X 0.3937 |
| Convert Ampere‑Turns per Centimeter to Ampere‑Turns per Inch (At/cm to At/in) |
At/in = At/cm X 2.54 |
Conversion Formulas for Density
| How to Convert: |
Equation: |
| Convert Pounds per Cubic Foot to Kilograms per Cubic Meter (lb/ft3 to kg/m3) |
kg/m3 = lb/ft3 X 16.02 |
| Convert Pounds per Cubic Foot to Pounds per Cubic Inch (lb/ft3 to lb/in3) |
lb/in3 = lb/ft3 X 5.787 X 10‑4 |
| Convert Pounds per Cubic Inch to Grams per Cubic Centimeter (lb/in3 to g/cm3) |
g/cm3 = lb/in3 X 27.68 |
| Convert Pounds per Cubic Inch to Kilograms per Cubic Meter (lb/in3 to kg/m3) |
kg/m3 = lb/in3 X 2.768 X 10‑4 |
| Convert Pounds per Cubic Inch to Pounds per Cubic Foot (lb/in3 to lb/ft3) |
lb/ft3 = lb/in3 X 1.728 |
Conversion Formulas for Energy, Work, or Heat
| How to Convert: |
Equation: |
| Convert British Thermal Units to Horsepower-Hours (Btu to hp‑h) |
hp‑h = Btu X 3.960 X 10‑4 |
| Convert Joules to Kilowatt‑Hours (j to kWh) |
kWh = j 2.778 X 10‑7 |
| Convert Foot‑Pounds to Kilogram‑Meters (ft‑lb to kg‑m) |
kg‑m = ft‑lb X 0.1383 |
| Convert Watts‑Hours to Foot‑Pounds (Wh to ft‑lb) |
ft‑lb = Wh X 2655 |
| Convert Horsepower-Hour to Kilowatt-Hours (hp‑h to kWh) |
kWh = hp‑h X 0.7457 |
| Convert Foot‑Pounds to Kilowatt‑Hours (ft‑lb to kWh) |
kWh = ft‑lb X 3.766 X 10‑7 |
| Convert British Thermal Units to Kilowatt‑Hours (Btu to kWh) |
kWh = Btu X 2.931 X 10‑4 |
| Convert British Thermal Unit to Watt‑Seconds (Btu to Ws) |
Ws = Btu X 1055 |
| Convert Joules to Watt‑Seconds (j to Ws) |
Ws = j X 1 |
| Convert British Thermal Units per Hour to Kilowatts (Btu/h to kW) |
kW = Btu/h X 2.931 X 10‑2 |
| Convert British Thermal Units per Minute to Kilowatts (Btu/min to kW) |
kW = Btu/min X 1.759 X 10‑2 |
| Convert Foot‑Pounds to Horsepower-Hours (ft‑lb to hp‑h) |
hp‑h = ft‑lb X 5.050 X 10‑7 |
| Convert British Thermal Units per Minute to Horsepower (Btu/min to hp) |
hp = Btu/min X 2.359 x 10‑2 |
| Convert Watt‑Hours to Horsepower-hours (Wh to hp‑h) |
hp‑h = Wh X 1.341 X 10‑3 |
| Convert Horsepower to Foot‑Pounds per Second (hp to ft‑lb/s) |
ft‑lb/s = hp X 550 |
| Convert Horsepower to Foot‑Pounds per Minute (hp to ft‑lb/min) |
ft‑lb/min = hp X 33000 |
| Convert Horsepower-Hours to Foot‑Pounds (hp‑h to ft‑lb) |
ft‑lb = hp‑h X 1.98 X 106 |
| Convert Ergs to Foot‑Pounds (erg to ft‑lb) |
ft‑lb = erg X 7.37 X 10‑6 |
| Convert Joules to Foot‑Pounds (j to ft‑lb) |
ft‑lb = j X 0.7376 |
| Convert Foot‑Pounds to Joules (ft‑lb to j) |
j = ft‑lb X 1.356 |
| Convert Joules to Ergs (j to erg) |
erg = j X 107 |
| Convert Watts to Ergs per Second (W to erg/s) |
erg/s = W X 10‑7 |
| Convert Ergs to Dyne per Centimeter (erg to dyn/cm) |
dyn/cm = erg X 1 |
| Convert Kilowatts to Foot‑Pounds per Second (kW to ft‑lb/s) |
ft‑lb/s = kW X 737.6 |
| Convert Kilowatts Hours to Foot‑Pounds (kWh to ft‑lb) |
ft‑lb = kWh X 2.655 X 106 |
| Convert British Thermal Units to Foot‑Pounds (Btu to ft‑lb) |
ft‑lb = Btu X 778.2 |
| Convert Joules to Calories (j to cal) |
cal = j X 0.2388 |
| Convert Horsepower to Kilocalories per Minute (hp to kcal/min) |
kcal/min = hp X 10.70 |
| Convert Watts to Foot‑Pounds per Inch (W to ft‑lb/in) |
ft‑lb/in = W X 44.26 |
| Convert Foot‑Pounds to Kilogram‑Meter (ft‑lb to kg‑m) |
kg‑m = ft‑lb X 7.233 |
| Convert Watts to Calories per Minute (W to cal/min) |
cal/min = W X 14.34 |
| Convert Watt‑Hours to Kilocalories (Wh to kcal) |
kcal = Wh X 0.8605 |
| Convert British Thermal Units to Kilocalories (Btu to kcal) |
kcal = Btu X 0.252 |
| Convert British Thermal Units to Calories (Btu to cal) |
cal = Btu X 252 |
| Convert Watt‑Hour to Kilogram‑Meters (Wh to kg‑m) |
kg‑m = Wh X 376.1 |
| Convert Joules to Kilogram‑Meters (j to kg‑m) |
kg‑m = j X 0.102 |
| Convert Horsepower-Hours to Kilogram‑Meters (hp‑h to kg‑m) |
kg‑m = hp‑h X 2.737 X 105 |
| Convert Foot‑Pounds to Kilogram‑Meters (ft‑lb to kg‑m) |
kg‑m = ft‑lb X 0.1383 |
| Convert British Thermal Units to Kilogram‑Meters (Btu to kg‑m) |
kg‑m = Btu X 107.6 |
| Convert Watt‑Hours to British Thermal Units (Wh to Btu) |
Btu = Wh X 3.412 |
| Convert Horsepower-Hours to British Thermal Units (hp‑h to Btu) |
Btu = hp‑h X 2544 |
| Convert Joules to British Thermal Units (j to Btu) |
Btu = j X 9.478 X 10‑4 |
| Convert Kilocalories to British Thermal Units (kcal to Btu) |
Btu = kcal X 3.968 |
| Convert Kilowatt‑Hours to British Thermal Units (kWh to Btu) |
Btu = kWh X 3.415 |
| Convert Foot‑Pounds to British Thermal Units (ft‑lb to Btu) |
Btu = ft‑lb X 1.285 X 10‑2 |
| Convert Watts to British Thermal Units per Minute (W to Btu/min) |
Btu/min = W X 0.05686 |
| Convert Kilowatts to British Thermal Units per Minute (kW to Btu/min) |
Btu/min = kW X 56.87 |
| Convert Horsepower to British Thermal Units per Minute (hp to Btu/min) |
Btu/min = hp X 42.41 |
| Convert Horsepower to British Thermal Units per Hour (hp to Btu/h) |
Btu/h = hp X 2544 |
| Convert Boiler Horsepower to British Thermal Units per Hour (bhp to Btu/h) |
Btu/h = bhp X 33520 |
Conversion Formulas for Flow Rate
| How to Convert: |
Equation: |
| Convert Gallons per Minute to Cubic Feet per Second (gal/min to ft3/s) |
ft3/s = gal/min X 2.228 X 10‑3 |
| Convert Miner's Inch to Cubic Feet per Minute (miner's inch to cfm) |
cfm = miner's inch X 1.5 |
Conversion Formulas for Force or Weight
| How to Convert: |
Equation: |
| Convert Dynes to Pounds (dyn to lb) |
lb = dyn X 2.248 X 10‑6 |
| Convert Pounds to Poundals (lb to pdl) |
pdl = lb X 32.17 |
Conversion Formulas for Electrical Inductance
| How to Convert: |
Equation: |
| Convert Henry to Millihenry (h to mh) |
mH = H X 103 |
Conversion Formulas for Length
| How to Convert: |
Equation: |
| Convert Centimeters to Inches (cm to in) |
in = cm X 0.3937 |
| Convert Fathoms to Feet (fm to ft) |
ft = fm X 6 |
| Convert Feet to Centimeters (cm to ft) |
cm = ft X 30.48 |
| Convert Inches to Centimeters (in to cm) |
cm = in X 2.54 |
| Convert Kilometers to Feet (km to ft) |
ft = km X 3281 |
| Convert Kilometers to Miles (km to mi) |
mi = km X 0.6214 |
| Convert Knots to Miles (kn to mi) |
mi = kn X 1.152 |
| Convert Meters to Feet (m to ft) |
ft = m X 3.281 |
| Convert Meters to Inches (m to in) |
in = m X 39.37 |
| Convert Miles to Feet (mi to ft) |
ft = mi X 5280 |
| Convert Miles to Kilometers (mi to km) |
km = mi X 1.609 |
Conversion Formulas for Magnetic Flux Density
| How to Convert: |
Equation: |
| Convert Ampere‑Turns to Gilberts (At to Gb) |
Gb = At X 1.257 |
| Convert Webers to Maxwells (Wb to Mx) |
Mx = Wb X 108 |
| Convert Kilolines to Maxwells (kli to Mx) |
Mx = kli X 103 |
| Convert Kilolines to Maxwells (Mx to kli) |
kli = Mx X 10‑3 |
| Convert Megalines to Maxwells (Mli to Mx) |
Mx = Mli X 106 |
| Convert Gauss to Lines per Square Inch (Gs to li/in2) |
li/in2 = Gs X 6.452 |
Conversion Formulas for Mass
| How to Convert: |
Equation: |
| Convert Kilograms to Pounds (kg to lb) |
lb = kg X 2.205 |
| Convert Poundals to Pounds (pdl to lb) |
lb = pdl X 0.03108 |
| Convert Long Tons to Pounds (LT to lb) |
lb = LT X 2240 |
| Convert Metric Tons to Pounds (mt to lb) |
lb = mt X 2205 |
| Convert Short Tons to Pounds (ST to lb) |
lb = ST X 2000 |
Conversion Formulas for Electrical Resistance
| How to Convert: |
Equation: |
| Convert Megaohms to Ohms (MΩ to Ω) |
Ω = MΩ X 106 |
| Convert Microohms to Ohms (μΩ to Ω) |
Ω = μΩ X 10‑6 |
| Convert Microohms per Cubic Centimeter to Microohms per Cubic Centimeter Inch
(μΩ‑cm3 to μΩ‑in3)
|
μΩ‑in3 = μΩ‑cm3 X 0.3937 |
| Convert Microohms per Cubic Centimeter to Circular Mil Ohms per Foot
(μΩ‑cm3 to cmil Ω‑ft)
|
cmil Ω‑ft = μΩ‑cm3 X 6.015 |
| Convert Ohms To Megaohms (Ω to MΩ) |
MΩ = Ω X 10‑6 |
| Convert Ohms to Microohms (Ω to μΩ) |
μΩ = Ω X 106 |
| Convert Ohms Circular Mil per Feet to Microohms per Cubic Centimeter
(Ω cmil ft to μΩ cm3)
|
μΩ cm3 = Ω cmil ft X 0.1662 |
| Convert Ohms Circular Mil per Feet to Microohms per Cubic Inch (Ω cmil ft to μΩ in3) |
μΩ in3 = Ω cmil ft X 0.06524 |
| How to Convert: |
Equation: |
| Convert Horsepower to Kilowatts (hp to kW) |
kW = hp X 0.7457 |
| Convert Horsepower to Horsepower (metric) (hp to hp(m)) |
hp(m) = hp X 1.014 |
| Convert Watts to Horsepower (W to hp) |
hp = W X 1.341 X 10‑3 |
| Convert Kilowatts to Horsepower (kW to hp) |
hp =kW X 1.341 |
Conversion Formulas for Pressure
| How to Convert: |
Equation: |
| Convert Kilograms per Square Meter to Pounds per Square Foot (kg/m2 to lb/ft2) |
lb/ft2 = kg/m2 X 0.2048 |
| Convert Kilograms per Square Meter to Pounds per Square Inch (kg/m2 to lb/in2) |
lb/In2 = kg/m2 X 1.422 X 10‑3 |
| Convert Atmospheres to Feet of Water (atm to ftH2O) |
ftH2O = atm X 33.90 |
| Convert Pounds per Square Inch to Feet of Water (psi to ftH2O) |
ftH2O = lb/in2 X 2.307 |
| Convert Pounds per Square Foot to Feet of Water (psf to ftH2O) |
ftH2O = lb/ft2 X 0.01602 |
| Convert Inches of Mercury to Feet of Water (inHg to ftH2O) |
ftH2O = inHg X 1.133 |
| Convert Kilograms per Square Meter to Feet of Water (kg/m2 to ftH2O) |
ftH2O = kg/m2 X 3.281 X 10‑3 |
| Convert Inches of Water to Ounces per Square Inch (inH2O to oz/in2) |
oz/in2 = inH2O X 0.5781 |
| Convert Inches of Water to Kilograms per Square Meter (inH2O to kg/m2) |
kg/m2 = inH2O X 25.40 |
| Convert Feet of Water to Kilograms per Square Meter (ftH2O to kg/m2) |
kg/m2 = ftH2O X 304.8 |
| Convert Pounds per Square Inch to Kilograms per Square Meter (psi to kg/m2) |
kg/m2 = lb/in2 X 703.1 |
| Convert Pounds per Square Foot to Kilograms per Square Meter (lb/ft2 to kg/m2) |
kg/m2 = lb/ft2 X 4.882 |
| Convert Pounds of Water to Cubic Feet (lb to ft3) |
ft3 = lb X 0.01602 |
| Convert Atmospheres to Centimeters of Mercury (atm to cmHg) |
cmHg = atm X 76 |
| Convert Atmospheres to Inches of Mercury (atm to inHg) |
inHg = atm X 29.92 |
| Convert Feet of Water to Inches of Mercury (ftH2O to inHg) |
inHg = ftH2O X 0.08826 |
| Convert Pounds per Square Inch to Inches of Mercury (lb/in2 to inHg) |
inHg = lb/in2 X 2.036 |
| Convert Inches of Mercury to Pounds per Square Inch (inHg to lb/in2) |
lb/in2 = inHg X 0.4912 |
| Convert Atmospheres to Pounds per Square Inch (atm to lb/in2) |
lb/in2 = atm X 14.70 |
| Convert Feet of Water to Pounds per Square Inch (ftH2O to lb/in2) |
lb/in2 = ftH2O X 0.4335 |
| Convert Pounds per Square Foot to Pounds per Square Inch (lb/ft2 to lb/in2) |
lb/in2 = lb/ft2 X 6.944 X 10‑3 |
| Convert Feet of Water to Pounds per Square Foot (ftH2O to lb/ft2) |
lb/ft2 = ftH2O X 62.43 |
| Convert Inches of Mercury to Pounds per Square Foot (inHg to lb/ft2) |
lb/ft2 = inHg X 70.73 |
Conversion Formulas for Torque
| How to Convert: |
Equation: |
| Convert Meter‑Kilogram to Pound‑Foot (m‑kg to lb‑ft) |
lb‑ft = m‑kg X 7.233 |
| How to Convert: |
Equation: |
| Convert Cubic Inches to Cubic Centimeters (in3 to cm3) |
cm3 = in3 X 16.39 |
| Convert Cubic Centimeters to Cubic Inches (cm3 to in3) |
in3 = cm3 X 6.102 X 10‑6 |
| Convert Cubic Feet to Cubic Meters (ft3 to m3) |
m3 = ft3 X 0.02832 |
| Convert Cubic Meters to Cubic Feet (m3 to ft3) |
ft3 = m3 X 35.31 |
| Convert Cubic Yards to Cubic Meters (yd3 to m3) |
m3 = yd3 X 0.7646 |
| Convert Acre‑Foot to Cubic Feet (af to ft3) |
ft3 = AF X 43560 |
| Convert Bushels to Cubic Feet (bu to ft3) |
ft3 = bu X 1.244 |
| Convert Cubic Meters to Cubic Yards (m3 to yd3) |
yd3 = m3 X 1.308 |
| Convert Cubic Feet to Liters (ft3 to l) |
l = ft3 X 28.32 |
| Convert Liters to Cubic Feet (l to ft3) |
ft3 = l X 0.03531 |
| Convert Liters to Cubic Inches (l to in3) |
in3 = l X 61.02 |
| Convert Gallons to Liters (gal to l) |
l = gal X 3.785 |
| Convert Liters to Gallons (l to gal) |
gal = L X 0.2642 |
| Convert Pounds of Water to Gallons (lb to gal) |
gal = lb X 0.1198 |
| Convert Cubic Feet to Gallons (ft3 to gal) |
gal = ft3 X 7.481 |
| Convert Gallons to Cubic Feet (gal to ft3) |
ft3 = gal X 0.1337 |
| Convert Gallons to Square Inches (gal to in2) |
in2 = gal X 231 |
| Convert Gallons to Cubic Meters (gal to m3) |
m3 = gal X 3.785 X 10‑3 |
| Convert Cords to Cubic Feet (cd to ft3) |
ft3 = cd X 128 |
Warning: When using this information to perform electrical work, call a licensed electrician and consult the NEC® for safety.
All licensed electricians have passed examinations covering the National Electric Code®, know state and local building codes, and may carry insurance to cover damages.