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Table 8: Conversion factors | Quantity | Some conversions | | Length | 1 in = 2.54 cm | 1 cm = 0.3048 in | 1 m = 39.37 in | | 1 foot (ft) = 12 in | 1 yard (yd) = 3 ft | 1 mile (mi) = 5,280 ft | | 1 mi = 1.609 km | 1 km = 0.621 mi | 1 angstrom (Å) = 10−10 m | | 1 AU = 1.50×1011 m | 1 light year (ly) = 9.46×1015 m | | | | | Area | 1 m2 = 10.76 ft2 | 1 in2 = 6.452 cm2 | 1 acre = 43,560 ft2 = 4,048 m2 | | | | Volume | 1 m3 = 1,000 liters (L) | 1 L = 1,000 cm3 | 1 gallon = 3.785 L | | | | Time | 1 year (yr) = 365.24 day | 1 day = 24 hr | 1 hr = 60 min | | 1 min = 60 s | 1 yr = 3.156×107 s | 1 day = 86,400 s | | | | Speed and velocity | 1 m/s = 2.237 mi/hr (mph) | 1 mph = 1.609 km/hr | 1 m/s = 3.600 km/hr | | | | Force | 1 N = 0.2248 pounds (lb) | 1 lb = 4.448 N | 1 ton = 2,000 lb | | | | Pressure | 1 Pa = 1 N/m2 | 1 Pa = 1.45×10−4 lb/in2 (psi) | 1 atm = 1.013×105 Pa | | | | Energy | 1 J = 107 erg | 1 calorie = 4.184 J | 1 Calorie = 1,000 calorie | | 1 eV = 1.602×10−19 J | 1 kWh = 3.6×106 J | 1 Btu = 1,055 J | | | | Power | 1 horsepower (hp) = 746 W | 1 hp = 550 ft lb/s | | | | | Mass | 1 kg = 1,000 g | 1 amu = 1.6605×10−27 kg | 1 kg has a weight of 2.205 lb | | | | Angular measures | 1 radian (rad) = 57.3° | π rad = 180° | 1 rad/s = 9.55 rev/min (rpm) |
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