Unit Conversions

Length

1 in = 2.54 cm—

1 ft = 30.48 cm—

1 yd = 0.9144 m—

1 mi = 1.609 km—

1 m = 3.281 ft—

1 km = 0.6214 mi—

1 ft = 12 in—

1 yd = 3 ft—

1 mi = 5280 ft—

1 nautical mi = 1.852 km—

Metric Length Prefixes

1 km = 1000 m—

1 m = 100 cm—

1 cm = 10 mm—

1 m = 1000 mm—

1 μm = 10⁻⁶ m—

1 nm = 10⁻⁹ m—

Weight / Mass

1 lb = 0.4536 kg—

1 kg = 2.205 lb—

1 oz = 28.35 g—

1 lb = 16 oz—

1 US ton = 907.2 kg—

1 metric ton = 1000 kg—

1 stone = 6.350 kg—

1 g = 1000 mg—

Volume (Liquid)

1 gal = 3.785 L—US gallon

1 L = 0.2642 gal—

1 cup = 236.6 mL—US cup

1 fl oz = 29.57 mL—

1 L = 33.81 fl oz—

1 tbsp = 14.79 mL—

1 tsp = 4.929 mL—

1 pint = 473.2 mL—

1 quart = 946.4 mL—

1 gal = 4 qt = 8 pt = 16 cups—

Volume (Dry / Cubic)

1 L = 1000 mL—

1 L = 1000 cm³—

1 m³ = 1000 L—

1 ft³ = 28.32 L—

1 in³ = 16.39 cm³—

1 gal = 231 in³—

Temperature

°F = (°C × 9/5) + 32—

°C = (°F - 32) × 5/9—

K = °C + 273.15—

0°C = 32°F = 273.15 K—Water freezes

100°C = 212°F = 373.15 K—Water boils

37°C = 98.6°F—Body temp

-40°C = -40°F—Same in both

0 K = -273.15°C—Absolute zero

Area

1 ft² = 929 cm²—

1 m² = 10.76 ft²—

1 acre = 43,560 ft²—

1 acre = 4,047 m²—

1 mi² = 640 acres—

1 hectare = 10,000 m²—

1 hectare = 2.471 acres—

1 km² = 100 hectares—

Speed & Time

1 mph = 1.609 km/h—

1 km/h = 0.6214 mph—

1 knot = 1.852 km/h—

1 m/s = 3.6 km/h—

1 hr = 3600 s—

1 day = 86,400 s—

1 year ≈ 365.25 days—

1 light-year ≈ 9.461×10¹² km—

Energy & Pressure

1 cal = 4.184 J—

1 kcal = 4184 J—Food Calorie

1 kWh = 3.6×10⁶ J—

1 eV = 1.602×10⁻¹⁹ J—

1 atm = 101,325 Pa—

1 atm = 760 mmHg—

1 bar = 100,000 Pa—

1 psi = 6895 Pa—

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