Unit conversions
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This document provides conversion factors between various units of measurement in the US Customary System (USC) and International System of Units (SI). It includes conversions for length, area, volume, mass, energy, time, and temperature between units such as miles, feet, inches, meters, grams, pounds, joules, watts, degrees Celsius, Fahrenheit, and Kelvin. Prefixes for the metric system are also defined, ranging from deci to exa which are powers of ten from 10-1 to 10+18.
Unit conversions
- 1. Conversions within the USC System and between the USC and SI Length 1 mile (mi) 5280 feet (ft) 1 yard (yd) 3 feet (ft) 1 foot (ft) 12 inches (in) 1 inch (in) = 2:54 centimeters (cm) 1 meter (m) = 3:281 feet (ft) 1 mile (mi) = 1609 meters (m) = 39:37 inches (in) = 1:609 kilometers (km) 1 light year (lt yr) = 9:454 ¢1015 meters (m) = 5:876 ¢1012 miles (mi) Area = length squared 1 acre 43;560 square feet (ft2 ) 1 hectare 10;000 square meters (m2 ) = 4048 square meters (m2 ) = 2:4704 acres Volume = length cubed 1 gallon (gal) = 3:785 liters (l) 1 uid ounce ( oz) = 1:804 cubic inches (in3 ) 1 cubic meter (m3 ) 1000 liters (l) 1 liter (l) 1000 cubic centimeters (cm3 ) = 264:2 gallons (gal) = 1:057 quarts (qt) 1 pint (pt) 2 cups 1 barrel of petroleum 42 gallons (gal) 16 uid ounces ( oz) = 0:159 cubic meter (m3 ) 1 quart (qt) 2 pints (pt) 1 gallon (gal) 4 quarts (qt) Mass/Weight 1 kilogram (kg) = 2:205 pounds (lb) (on the surface of the earth) 1 pound (lb) 16 ounces avoirdupois (oz) = 453:6grams (g) (on the surface of the earth) Energy 1 joule (J) 1 kg ¡m2 s2 1 watt-second (Ws) = 0:2390 calories (cal) = 2:390 ¢10 4 food calories (Kcal) = 9:484 ¢10 4 British thermal units (Btu) = 6:242 ¢1018 electron volts (eV) = 0:7375 foot pounds (ft lb) 1 kiloton of TNT = 4:2 ¢1012 joules (J) 1
- 2. Power = energy time 1 Watt (W) 1 joule second 1 horsepower (hp) = 0:7457 kilowatts (kW) Time 1 year (yr) = 3:1558 ¢107 seconds (s) 1 day 24 hours (hr) = 8:766 ¢103 hours (hr) 1440 minutes (min) 8:64 ¢104 seconds (s) Temperature equations Celsius Temp (C) 5 9 (F 32) Fahrenheit Temp (F) 9 5 (C) + 32 Kelvin Temp (K) = (C) + 273:15 Pre
- 3. xes for Conversion within the Metric System (SI) 101 deka (da) 10 1 deci (d) 102 hecto (h) 10 2 centi (c) 103 kilo (k) 10 3 milli (m) 106 mega (M) 10 6 micro () 109 giga (G) 10 9 nano (n) 1012 tera (T) 10 12 pico (p) 1015 peta (P) 10 15 femto (f) 1018 exa (E) 10 18 atto (a) 2