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

Questions & Answers

Ask a question about Conversions Factors and Formulas. Click here
Customer Reviews



About Us Contact Us Customer Reviews Facebook Twitter Disclaimers Privacy Policy Returns Shipping Policy Terms of Sale Terms of Use Warranty FAQ Site Map Technical Info Terminology Troubleshooting
  • Internet prices apply only to Internet purchases.
  • Minimum order amount is $20.00.
  • All merchandise listed is in stock.
  • Orders are shipped the next business day.
  • We only sell within the 48 adjacent United States.
  • Shipping tracking numbers are e-mailed automatically.
  • Office hours are: Mon - Fri, 8am - 4:30pm EST excl. holidays.
Copyright © 2024 All Rights Reserved.