# Conversion Factors and Formulas

## Conversion Factors

acre (ac) = 0.4 hectare(ha)
acre-inch (ac-in) = 27,154 gallon (gal)
cubic feet (ft3) = 7.48 gallon (gal)
cubic centimeter (cm3) = 0.000001 cubic meter (m3)
cubic feet (ft3) = 0.028 cubic meter (m3)
cubic inch (in3) = 16.39 cubic centimeter (cm3)
cubic yard (yd3) = 0.76 cubic meter (m3)
feet (ft) = 0.3048 meter (m)
gallon (gal) = 3.79 liter (L)
gallon/acre (gal/ac) = 9.35 liter/hectare (L/ha)
hectare (ha) = 10,000 square meter (m2)
inch (in) = 2.54 centimeter (cm)
mile (mi) = 1.61 kilometer (km)
ounce  weight basis (oz) = 28.35 gram (g)
ounce  fluid basis (oz) = 30 milliliters (mL)
parts per million (mg/kg) = 0.002 pound/ton (lb/t)
parts per million (mg/L) = 0.00835 pound/1000 gallon (lb/1000gal)
percent (%) = 10,000 parts per million (ppm)
pound (lb) = 0.454 kilogram (kg)
pound/1000 gallon (lb/1000gal) = 27.154 pound/acre-inch (lb/ac-in)
pound/acre (lb/ac) = 1.12 kilogram/hectare (kg/ha)
pound/cubic foot (lb/ft3) = 16.02 kilogram/cubic meter (kg/m3)
pound/gallon (lb/gal) = 119,826 parts per million (mg/L)
square feet (ft2) = 0.093 square meter (m2)
square mile (mi2) = 2.59 square kilometer (km2)
square mile (mi2) = 640 acre (ac)
ton (t) = 2,000 pound (lb)
ton (t) = 0.907 metric ton (Mg)
ton, metric (Mg) = 2,205 pound (lb)
ton, metric (Mg) = 1,000 kilogram (kg)
yard (yd) = 0.9144 meter (m)

## Formulas

Area of a square = length x width
Area of a circle = Pi x r2
Volume of a cube = length x width x height
Volume of a cylinder = h x Pi x r2