Here’s a physics unit conversion cheat sheet for common quantities. You can use this to convert between different units of measure often encountered in physics problems.
- 1 meter (m) = 100 centimeters (cm)
- 1 meter (m) = 1000 millimeters (mm)
- 1 kilometer (km) = 1000 meters (m)
- 1 inch (in) = 2.54 centimeters (cm)
- 1 foot (ft) = 12 inches (in) = 0.3048 meters (m)
- 1 mile = 1.609 kilometers (km)
- 1 kilogram (kg) = 1000 grams (g)
- 1 gram (g) = 1000 milligrams (mg)
- 1 metric ton = 1000 kilograms (kg)
- 1 pound (lb) = 0.4536 kilograms (kg)
- 1 ounce (oz) = 28.3495 grams (g)
- 1 minute = 60 seconds (s)
- 1 hour = 60 minutes = 3600 seconds (s)
- 1 day = 24 hours = 86,400 seconds (s)
- 1 newton (N) = 1 kg·m/s²
- 1 dyne =
$( 10^{-5} )$ N - 1 pound-force (lbf) = 4.448 N
- 1 joule (J) = 1 N·m = 1 kg·m²/s²
- 1 kilojoule (kJ) = 1000 joules (J)
- 1 electron volt (eV) =
$( 1.602 \times 10^{-19} )$ J - 1 calorie (cal) = 4.184 J
- 1 kilocalorie (kcal) = 4184 J
- 1 kilowatt-hour (kWh) = 3.6 ×
$( 10^6 )$ J
- 1 watt (W) = 1 J/s
- 1 kilowatt (kW) = 1000 W
- 1 horsepower (hp) = 746 W
- 1 pascal (Pa) = 1 N/m²
- 1 atmosphere (atm) = 101,325 Pa
- 1 bar = 100,000 Pa
- 1 torr = 133.322 Pa
- 1 psi (pounds per square inch) = 6894.76 Pa
- K = °C + 273.15 (Kelvin to Celsius)
- °C = (°F - 32) / 1.8 (Celsius to Fahrenheit)
- 1 meter per second (m/s) = 3.6 kilometers per hour (km/h)
- 1 kilometer per hour (km/h) = 0.27778 m/s
- 1 mile per hour (mph) = 1.609 km/h
- 1 coulomb (C) = 6.242 ×
$( 10^{18} )$ electrons - 1 ampere (A) = 1 C/s
- 1 volt (V) = 1 J/C
- 1 ohm (Ω) = 1 V/A
- 1 farad (F) = 1 C/V
- 1 tesla (T) = 1 N/(A·m)
- 1 gauss (G) =
$( 10^{-4} )$ T
- 1 hertz (Hz) = 1 cycle per second (
$s(^{-1})$ ) - 1 kilohertz (kHz) = 1000 Hz
- 1 megahertz (MHz) = 1,000,000 Hz
- 1 radian (rad) = 57.2958 degrees (°)
- 1 degree (°) =
$( \frac{\pi}{180} )$ radians