Conversion Factors

Inch/Pound to SI


Multiply	By	To obtain
Length
inch (in.)	2.54	centimeter (cm)
inch (in.)	25.4	millimeter (mm)
foot (ft)	0.3048	meter (m)
mile (mi)	1.609	kilometer (km)
yard (yd)	0.9144	meter (m)
Area
acre	4,047	square meter (m2)
acre	0.4047	hectare (ha)
acre	0.4047	square hectometer (hm2)
acre	0.004047	square kilometer (km2)
square foot (ft2)	0.09290	square meter (m2)
section (640 acres or 1 square mile)	259.0	square hectometer (hm2)
square mile (mi2)	259.0	hectare (ha)
square mile (mi2)	2.590	square kilometer (km2)
Volume
gallon (gal)	0.003785	cubic meter (m3)
million gallons (Mgal)	3,785	cubic meter (m3)
cubic inch (in3)	16.39	cubic centimeter (cm3)
cubic foot (ft3)	0.02832	cubic meter (m3)
cubic yard (yd3)	0.7646	cubic meter (m3)
acre-foot (acre-ft)	1,233	cubic meter (m3)
Flow rate
acre-foot per day (acre-ft/d)	0.01427	cubic meter per second (m3/s)
acre-foot per year (acre-ft/yr)	1,233	cubic meter per year (m3/yr)
foot per second (ft/s)	0.3048	meter per second (m/s)
cubic foot per second (ft3/s)	0.02832	cubic meter per second (m3/s)
million gallons per day (Mgal/d)	0.04381	cubic meter per second (m3/s)
inch per day (in/d)	25.4	millimeter per day (mm/d)
inch per year (in/yr)	25.4	millimeter per year (mm/yr)
mile per hour (mi/h)	0.4470	meter per second (m/s)
Mass
ounce, avoirdupois (oz)	28.35	gram (g)
pound, avoirdupois (lb)	0.4536	kilogram (kg)
Pressure
atmosphere, standard (atm)	101.3	kilopascal (kPa)
bar	100	kilopascal (kPa)
inch of mercury at 60 °F (in. Hg)	3.377	kilopascal (kPa)
pound-force per square inch (lbf/in2)	6.895	kilopascal (kPa)
pound per square foot (lb/ft2)	0.04788	kilopascal (kPa)
pound per square inch (lb/in2)	6.895	kilopascal (kPa)
Density
pound per cubic foot (lb/ft3)	16.02	kilogram per cubic meter (kg/m3)
pound per cubic foot (lb/ft3)	0.01602	gram per cubic centimeter (g/cm3)
Energy
kilowatthour (kWh)	3,600,000	joule (J)
calorie (cal)	4.187	joule (J)

SI to Inch/Pound


Multiply	By	To obtain
Length
centimeter (cm)	0.3937	inch (in.)
millimeter (mm)	0.03937	inch (in.)
meter (m)	3.281	foot (ft)
kilometer (km)	0.6214	mile (mi)
meter (m)	1.094	yard (yd)
Area
square meter (m2)	0.0002471	acre
hectare (ha)	2.471	acre
square hectometer (hm2)	2.471	acre
square kilometer (km2)	247.1	acre
square meter (m2)	10.76	square foot (ft2)
square hectometer (hm2)	0.003861	section (640 acres or 1 square mile)
hectare (ha)	0.003861	square mile (mi2)
square kilometer (km2)	0.3861	square mile (mi2)
Volume
cubic meter (m3)	264.2	gallon (gal)
cubic meter (m3)	0.0002642	million gallons (Mgal)
cubic centimeter (cm3)	0.06102	cubic inch (in3)
cubic meter (m3)	35.31	cubic foot (ft3)
cubic meter (m3)	1.308	cubic yard (yd3)
cubic meter (m3)	0.0008107	acre-foot (acre-ft)
Flow rate
cubic meter per second (m3/s)	70.07	acre-foot per day (acre-ft/d)
cubic meter per year (m3/yr)	0.000811	acre-foot per year (acre-ft/yr)
meter per second (m/s)	3.281	foot per second (ft/s)
cubic meter per second (m3/s)	35.31	cubic foot per second (ft3/s)
cubic meter per second (m3/s)	22.83	million gallons per day (Mgal/d)
millimeter per day (mm/d)	0.03937	inch per day (in/d)
millimeter per year (mm/yr)	0.03937	inch per year (in/yr)
meter per second (m/s)	2.237	mile per hour (mi/h)
Mass
gram (g)	0.03527	ounce, avoirdupois (oz)
kilogram (kg)	2.205	pound avoirdupois (lb)
Pressure
kilopascal (kPa)	0.009869	atmosphere, standard (atm)
kilopascal (kPa)	0.01	bar
kilopascal (kPa)	0.2961	inch of mercury at 60°F (in. Hg)
kilopascal (kPa)	0.1450	pound-force per square inch (lbf/in2)
kilopascal (kPa)	20.88	pound per square foot (lb/ft2)
kilopascal (kPa)	0.1450	pound per square inch (lb/in2)
Density
kilogram per cubic meter (kg/m3)	0.06242	pound per cubic foot (lb/ft3)
gram per cubic centimeter (g/cm3)	62.4220	pound per cubic foot (lb/ft3)
Energy
joule (J)	0.000000278	kilowatthour (kWh)
joule (J)	0.2388	calorie (cal)
Power
watt (W)	0.001341	horsepower (hp)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:


°F=(1.8×°C)+32


Temperature in degrees Fahrenheit (°F) may be converted to degrees Celsius (°C) as follows:


°C=(°F-32)/1.8


Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 
(NGVD 29).


Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27).


Altitude, as used in this report, refers to distance above the vertical datum.


First posted March 4, 2013