UNITS OF MEASUREMENT

1 inch (in) = 2.54 centimeters (cm) = 25.4 millimeters (mm)

1 foot (ft) = 30.5 centimeters (cm) = 0.305 meters (m)

1 yard (yd) = 36 inches (in) = 0.914 meters (m)

1 mile (mi) = 5280 feet (ft) = 1.61 kilometers (km)

1 square yard (yd2) = 9 square feet (ft2) = 0.836 square meters (m2)

1 acre (ac) = 43,560 square feet (ft2) = 0.405 hectares (ha) = 4050 square meters (m2)

1 square mile (mi2) = 640 acres (ac) = 259 hectares (ha)

1 cubic foot (ft3) = 7.48 gallons (gal) = 28.3 liters (L)

1 cubic yard (yd3) = 27 cubic feet (ft3) = 202 gallons (gal) = 0.765 cubic meters (m3)

1 gallon (gal) = 0.137 cubic feet (ft3) = 8.33 pounds (lbs) water = 3.78 liters (L)

1 acre-inch (ac-in) = 3630 cubic feet (ft3) = 27,154 gallons (gal) = 102.8 cubic meters(m3)

1 acre-foot (ac-in) = 43,560 cubic feet (ft3) = 325,851 gallons (gal) = 1234 cubic meters (m3)

1 pound (lb) = 454 grams (g) = 0.454 kilograms (kg)

1 ton (ton) = 2000 pounds (lbs) = 907 kilograms (kg) = 0.907 megagrams (Mg)

1 pound per acre (lb/ac) = 1.12 kilograms per hectare (kg/ha)

1 bushel per acre, 60 lb (bu/ac) = 67.2 kilograms per hectare (kg/ha)

1 bushel per acre, 56 lb (bu/ac) = 62.7 kilograms per hectare (kg/ha)

1 bushel per acre, 48 lb (bu/ac) = 53.8 kilograms per hectare (kg/ha)

1 cubic foot per second (cfs) = 449 gallons per minute (gpm) = 28.32 liters per second (L/s)

1 million gallons per day (MGD) = 1.55 cubic feet per second (cfs) = 3785 cubic meters per day (m3/day)

1 milligram per liter (mg/L) =1 part per million (ppm) =1000 parts per billion (ppb)*

1 microgram per liter (mg/L) =1 nanogram per milliliter (ng/mL) = 1 part per billion (ppb) *

1 nanogram per liter (ng/L) =1 part per trillion (ppt) = 1000 parts per quadrillion (ppq) *

1 picogram per liter (pg/L) = 1 part per quadrillion (ppq) *

1 grain per gallon (gpg) = 17.1 milligrams per liter (mg/L)

1 pound per square inch (psi) = 2.04 inches mercury (in Hg) = 27.7 inches water (in H2O)