Conversions Factors and Formulas

Area and Distance
  • Acres x 40.47 = areas
  • Acres x 4840 = square yards
  • Acre x 43560 = square feet
  • Areas x 100 = square meters
  • Circumference of circle x 0.3183 = Diameter of the circle
  • Diameter of circle x 3.14 = Circumference of circle
  • Diameter squared x 0.7854 = Area of circle
  • Feet x 12 = inches
  • Hectares x 100 = areas
  • Inches x 0.0833 = feet
  • Miles x 5280 = feet
  • Miles x 1760 = yards
  • Radius squared x 3.14 = Area of circle
  • Square mile ("Sections") x 640 = Acres
  • Square miles x 259 = hectares
  • Square kilometers x 100 = hectares
  • Yards x 3 = feet
Flow and Water Volume
  • Acre inches per hour x 453 = U.S. gallons per minute
  • Acre feet x 325,850 = U.S. gallons
  • Acre inches per hour x 1712.3 = liters per minute
  • Acre inches x 27154 = U.S. gallons
  • Acre feet x 1231.7 = cubic meters
  • Acre inch x 102.64 = cubic meters
  • British Imperial gallons x 1.201 = U.S. gallons
  • Cubic feet per minute x 7.48 = U.S. Gallons per minute
  • Cubic feet per second x 448.8 = U.S. Gallons per minute
  • Cubic feet per minute x 1699 = liters per hour
  • Cubic Meter Per Hour (Cu meters/hr) X 4.403 GPM (US)
  • Gallons per minute (U.S. gpm) x 0.00223 = Cubic feet per second
  • Gallons per minute (U.S. gpm) x 0.833 = British Imperial gallons
  • One inch of water depth = 0.62 gallons per square foot of area
  • Gallons per minute (U.S. gpm) x 226.8 = liters per hour
  • Gallons per minute (U.S. gpm) x .1337 = Cubic feet per minute
  • Gallons per Minute (GPM) (US) X 3.785 = liters/min
  • Gallons per minute (U.S. gpm) X 3.8 = Kg of water/min
  • Gallons per minute (U.S. gpm) @ 50 Hz X 1.2 = Gal/min @ 60 Hz
  • Gallons per minute (U.S. gpm) @ 60 Hz X .833 = Gal/min @ 50 Hz
  • Kilograms of water per Minute (Kg of water/min) X .264 = GPM (US)
  • Liters per Second (Liters/sec ) X 15.85 GPM (US)
  • Liters per Minute (Liters/min) X .264 GPM (US)
  • velocity (feet/second) x 0.3047 = velocity (meters/second)
  • Velocity in feet per second = (0.408 x GPM) / Inside diameter of pipe in inches, squared
  • Velocity (meters/second) x 3.281 = Velocity (feet/second)
Metric to U.S. System
  • Bars x 14.5038 = pounds per square inch (PSI)
  • Centimeters (cm) x 0.3937 = inches (")(in)
  • Cubic meters x 35.315 = cubic feet
  • Cubic centimeters x 0.06102 = cubic inches
  • Cubic meters x 35.315 = cubic feet
  • Kilograms (kg) x 2.205 = Pounds (P)
  • Kilometers (km) x 0.62137 = miles (mi)
  • Kilometers (km) x 3280.87 = feet (')(ft)
  • Kilometers (km) x 1093.62 = yards (yds)
  • Liters (l) x 0.2642 = gallons (U.S.)(gals)
  • Liters (l) x 0.0353 = cubic feet
  • Meters (m) x 39.37 = inches (")(in)
  • Meters (m) x 3.281 = feet (')(ft)
  • Meters (m) x 1.094 = yards (yds)
  • Millimeters (mm) x 0.03937 = inches (")(in)
  • Square centimeters x 0.155 = square inches
  • Square meters x 10.76 = square feet
  • Square kilometers x 0.386 = square miles
Length
  • Centimeters X .394 = inches
  • Meters X 3.281 = feet
  • Microns X .0000394 = inches
  • Millimeters X .0394 = inches
  • Mils X .001 = inches
Mass
  • Cubic foot of water X 62.4 = lbs (pounds)
  • Gallons of water (US) X 8.336 = lbs (pounds)
  • Kilograms X 2.2 = lbs (pounds)
  • Lbs (pounds) X .454 = Kilograms
  • Metric ton X 2205 = lbs (pounds)
  • Ounces X .0625 = lbs (pounds)
Metric Prefixes
  • Mega = 1,000,000
  • Kilo = 1,000
  • Hecto = 100
  • Deca = 10
  • (Meter) = 1
  • Deci = .1
  • Centi = .01
  • Milli = .001
  • Micro = .000001
Power
  • Boiler horsepower X 9.803 = Kilowatts
  • Horsepower X 0.7457 = Kilowatt
  • Horsepower X 745.7 = Watts
  • Kilowatts X 1.341= Horsepower
  • Watts X 0.001 = kilowatts
Pressure
  • atmosphere (Atm) x 1.013 = 1 bar (b)
  • atmosphere x 14.696 = Pounds per square inch (PSI)
  • bars x 1.033 = kilograms per square centimeter
  • bars x 14.67 = Pounds per square inch (PSI)
  • bars x 100 = kiloPascals
  • Feet head (of water) x .433 = Pounds per square inch (PSI)
  • Feet head (of water) x 0.3049 = meters head (of water)
  • Feet head (of water) x 0.0295 = atmospheres
  • Feet head (of water) x 2.988 = kiloPascals
  • Inches of mercury (Hg ) X .491 = Pounds per square inch (PSI)
  • Inches of mercury (Hg ) x 1.133 = Feet head (of water)
  • Kilograms per square centimeter x 14.223 = pounds per square inch (PSI)
  • KiloPascal x 0.145 = Pounds per square inch (PSI)
  • KiloPascal x 0.01 = bars
  • KiloPascal x 0.334 = feet head (of water)
  • Meters head (of water) x 3.28 = feet head (of water)
  • Meters of water X 1.42 = Pounds per square inch (PSI)
  • Millimeters of Mercury (mm Hg) X .039 = Inches of Mercury (Hg)
  • Newton/meter sq. X 1 = Pascal
  • Pounds per square inch (PSI) x 2.31 = feet head (ft. hd.)
  • Pounds per square inch (PSI) x 0.0703 = kilograms per square centimeter
  • Pounds per square inch (PSI) x 0.06895 = bars
  • Pounds per square inch (PSI) x 0.06805 = atmospheres
  • Pounds per square inch (PSI) x 2.31 = feet head (of water)
  • Pounds per square inch (PSI) x 6.896 = kiloPascals
Pump Conversions
Note: Horsepower is Brake horse power for an electric motor. Do not use for fuel-powered pump engines!
  • Brake Horsepower= GPM (gallons per minute) X TDH (Total Dynamic Heqad) / pump efficiency X 3960(constant)
  • Feet head = (2178 x horsepower) / GPM (assuming 55% pump efficiency)
  • GPM = (horsepower x 2178) / feet head (assuming 55% pump efficiency)
  • Efficiency of pump = (GPM x feet head) / (horsepower x 3960)
  • Horse powers x 745.7 = watts (W)
  • One HP = 33,000 Foot pounds per minute
  • Water flow (in cubic meters per second) = 0.55 x pump power (watts) / pressure (pascals)
  • Water flow (in liters per second) = 5.43 x pump power (kilowatts) / pressure (bars)
  • Weight per gallon of water= 8.34 lbs
  • 3960 Constant= 33,000 Foot pounds per minute divided by 8.34 weight per gallon of water (rounded)
Temperature
  • C= 5/9(F-32)
  • F= 9/5 C+32
U.S. to Metric System
  • Acres x 4046.85 = square meters
  • Cubic inches x 16.39 = cubic centimeters
  • Cubic feet x 0.0283 = cubic meters
  • Cubic feet x 28.316 = liters (l)
  • Feet (')(ft) x 0.3048 = meters (m)
  • Feet (')(ft) x 0.0003048 = kilometers (km)
  • Gallons (gals) x 3.78 = liters (l)
  • Inches (")(in) x 25.4 = millimeters (mm)
  • Inches (")(in) x 2.54 = centimeters (cm)
  • Inches (")(in) x 0.0254 = meters (m)
  • Miles (mi) x 1.6093 = kilometers (km)
  • Pounds (P) x 0.4536 = kilograms (kg)
  • Square inches x 6.452 = square centimeters
  • Square feet x 0.0929 = square meters
  • Square miles x 2.59 = square kilometers
  • Yards (yds) x 0.9144 = meters (m)
Volume
  • Cubic meters X 264.2 = Gallon (US)
  • Cubic meters X 1000 = Liters
  • Cubic feet X 7.48 = Gallon (US)
  • Cubic inches X .00433 = Gallon (US)
  • Cubic centimeters X .0338= Fluid ounces
  • Fluid ounces X 29.57 = Cubic centimeters
  • Gallon (Brit) X 1.2 = Gallon (US)
  • Gallon (US) l X 128 = Fluid ounces
  • Gallon (US) X 3.785 = Liters
  • Lbs of water X .119 = Gallon (US)
  • Liters X .264= Gallon (US)
  • Liters X 1000 = Cubic centimeters

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