USCS Unit System (U.S. Customary System)

The USCS system covers conversions between units of length, area, volume, and weight.

Length Units (USCS)

12 inches (in) or "
3 feet (ft)
16.5 feet (ft)
5.5 yards (yd)
5,280 feet (ft)

= 1 foot (ft) or '
= 1 yard (yd)
= 1 rod (rd)
= 1 rod (rd)
= 1 mile (mi)

144 in²
9 ft²
160 rd²
640 acres

= 1 ft²
= 1 yd²
= 10 chain² = 1 acre
= 1 mile² = 1 section

1,728 in³
27 ft³

2 pints (pt)
8 quarts (qt)
4 pecks (pk)

4 gills (gi)
4 quarts (qt)
7.4805 gallons (gal)

= 1 cubic foot (ft³)
= 1 cubic yard (yd³)

= 1 quart (qt)
= 1 peck (pk)
= 1 bushel (bu)

= 1 pint (pt)
= 1 gallon (gal)
= 1 cubic foot (ft³)

16 drams (dr) = 437.5 grains (gr)
16 ounces (oz) = 7,000 grains (gr)
100 pounds (lb)
2,000 pounds (lb)
2,240 pounds (lb)

= 1 ounce (oz)
= 1 pound (lb)
= 1 hundredweight (cwt)
= 1 short ton
= 1 long ton

SCFM = CFM × (P_actual / 14.7 psia) × (528°R / T_actual)

SCFM: Standard cubic feet per minute (14.7 psia and 68°F)

CFM: Cubic feet per minute at actual operating conditions