Basic Units of Measurement and Conversions - Basic Mathematics for Water and Wastewater Operators - page 12

TABLE 2.3
Conversion Table

To Convert Multiply by To Get

Feet 12 Inches

Yards 3 Feet

Yards 36 Inches

Inches 2.54 Centimeters

Meters 3.3 Feet

Meters 100 Centimeters

Meters 1000 Millimeters

Square yards 9 Square feet

Square feet 144 Square inches

Acres 43,560 Square feet

Cubic yards 27 Cubic feet

Cubic feet 1728 Cubic inches

Cubic feet (water) 7.48 Gallons

Cubic feet (water) 62.4 Pounds

Acre-feet 43,560 Cubic feet

Gallons (water) 8.34 Pounds

Gallons (water) 3.785 Liters

Gallons (water) 3785 Milliliters

Gallons (water) 3785 Cubic centimeters

Gallons (water) 3785 Grams

Liters 1000 Milliliters

Days 24 Hours

Days 1440 Minutes

Days 86,400 Seconds

Million gallons/day 1,000,000 Gallons/day

Million gallons/day 1.55 Cubic feet/second

Million gallons/day 3.069 Acre-feet/day

Million gallons/day 36.8 Acre-inches/day

Million gallons/day 3785 Cubic meters/day

Gallons/minute 1440 Gallons/day

Gallons/minute 63.08 Liters/minute

Pounds 454 Grams

Grams 1000 Milligrams

Pressure (psi) 2.31 Head (feet of water)

Horsepower 33,000 Foot-pounds/minute

Horsepower 0.746 Kilowatts

To Get Divide by To Convert

The following conversion factors are used extensively in environmental engineer-
ing (e.g., water and wastewater operations):

• 7.48 gallons = 1 cubic foot (ft 3 )

• 3.785 liters = 1 gallon (gal)