Weights and Measures

U.S. Common Weights and Measures

Metric Weights and Measures

Conversion Factors, Equivalents, and Standards

12 in = 1 ft

3 ft = 1 yd

16.5 ft = 1 rd

5280 ft = 1 mi

144 sq in = 1 sq ft

9 sq ft = 1 sq yd

1728 cu in = 1 cu ft

27 cu ft = 1 cu yd

231 cu in = 1 gal

1 in = 2.5399 cm

1 ft = 30.479 cm

1 yd = .9144 m

1 mi = 1609.3 m

1 mi = 1.6093 km

1 mm = .03937 in

1 cm = .3937 in

1 m = 39.3708 in

1 m = 3.2809 ft

1 m = 1.0936 yd

1 km = .6215 mi

1 sq in = 6.451 sq cm

1 sq cm =.155 sq in

1 cu in = 16.3862 cu cm

1 oz = 28.3495 gm

1 lb = 453.593 gm

1 kg = 2.2046 lb

1 cu ft of water weighs 62.4 lb.

Water freezes at 32 F (0 C).

Water boils at 212 F (100 C).

60 mi/hr = 88 ft/sec, 1 mi/min

Acceleration due to gravity is 9.81 meters (32 ft) per second per second.

The speed of sound (Mach 1) at sea level is 1,088 ft/sec at 32F.

Light travels at 299,792.548 km (186,282 mi) per second.

e (Base of the Natural Logarithm) = 2.71828

p (pi) = 3.14159265

Circumference of a Circle = 2p r

Area of a Circle = p r² or 1/4(p d²)

Surface of a Sphere = 4p r²

Volume of a Sphere = 1/6(p d³)

1 Mile (Land Mile, Statute Mile) = 5,280 feet, 1,760 yards, 1,609 meters

1 Nautical Mile (Air Mile, Sea Mile) = 1,852 meters, 6,076.115 feet

1 Nautical Mile per Hour (knot, kn, kt) = 1.15 statute mi/hr, 1.85 km/hr

1 F = -17.222 C

1 C = 33.8 F

Celsius = 5/9 (Fahrenheit - 32)

The Earth:

Circumference at the Equator: 24,901.45 mi, 40,066.43 km

Total Land Area: 57,900,000 sq mi, 150,100,00 sq km

Total Water Area: 147,750,000 sq mi, 382,672,500 sq km (75% of the surface)

Type of Water: 97% Salt, 3% Fresh

Atmosphere: 78% Nitrogen, 21% Oxygen, .9% argon, .03% carbon dioxide

Layers of the Atmosphere:

Troposphere - 10 mi, 16 km

Stratosphere - 30 mi, 50 km

Ionosphere 6,000 mi, 9,600 km