# How to Convert Common Units

## Conversion Formulas for Angles

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

## Conversion Formulas for Power

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

## Conversion Formulas for Volume

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.