Conversion Factors

Length
m cm km
1 meter 1 102 10−3
1 centimeter 10−2 1 10−5
1 kilometer 103 105 1
1 inch [latex] 2.540\,×\,{10}^{-2} [/latex] 2.540 [latex] 2.540\,×\,{10}^{-5} [/latex]
1 foot 0.3048 30.48 [latex] 3.048\,×\,{10}^{-4} [/latex]
1 mile 1609 [latex] 1.609\,×\,{10}^{4} [/latex] 1.609
1 angstrom 10−10
1 fermi 10−15
1 light-year [latex] 9.460\,×\,{10}^{12} [/latex]
in. ft mi
1 meter 39.37 3.281 [latex] 6.214\,×\,{10}^{-4} [/latex]
1 centimeter 0.3937 [latex] 3.281\,×\,{10}^{-2} [/latex] [latex] 6.214\,×\,{10}^{-6} [/latex]
1 kilometer [latex] 3.937\,×\,{10}^{4} [/latex] [latex] 3.281\,×\,{10}^{3} [/latex] 0.6214
1 inch 1 [latex] 8.333\,×\,{10}^{-2} [/latex] [latex] 1.578\,×\,{10}^{-5} [/latex]
1 foot 12 1 [latex] 1.894\,×\,{10}^{-4} [/latex]
1 mile [latex] 6.336\,×\,{10}^{4} [/latex] 5280 1

Area

[latex] 1\,{\text{cm}}^{2}=0.155\,{\text{in.}}^{2} [/latex]

[latex] 1\,{\text{m}}^{2}={10}^{4}\,{\text{cm}}^{2}=10.76\,{\text{ft}}^{2} [/latex]

[latex] 1\,{\text{in.}}^{2}=6.452\,{\text{cm}}^{2} [/latex]

[latex] 1\,{\text{ft}}^{2}=144\,{\text{in.}}^{2}=0.0929\,{\text{m}}^{2} [/latex]

Volume

[latex] 1\,\text{liter}=1000\,{\text{cm}}^{3}={10}^{-3}\,{\text{m}}^{3}=0.03531\,{\text{ft}}^{3}=61.02\,{\text{in.}}^{3} [/latex]

[latex] 1\,{\text{ft}}^{3}=0.02832\,{\text{m}}^{3}=28.32\,\text{liters}=7.477\,\text{gallons} [/latex]

[latex] 1\,\text{gallon}=3.788\,\text{liters} [/latex]

Time
s min h day yr
1 second 1 [latex] 1.667\,×\,{10}^{-2} [/latex] [latex] 2.778\,×\,{10}^{-4} [/latex] [latex] 1.157\,×\,{10}^{-5} [/latex] [latex] 3.169\,×\,{10}^{-8} [/latex]
1 minute 60 1 [latex] 1.667\,×\,{10}^{-2} [/latex] [latex] 6.944\,×\,{10}^{-4} [/latex] [latex] 1.901\,×\,{10}^{-6} [/latex]
1 hour 3600 60 1 [latex] 4.167\,×\,{10}^{-2} [/latex] [latex] 1.141\,×\,{10}^{-4} [/latex]
1 day [latex] 8.640\,×\,{10}^{4} [/latex] 1440 24 1 [latex] 2.738\,×\,{10}^{-3} [/latex]
1 year [latex] 3.156\,×\,{10}^{7} [/latex] [latex] 5.259\,×\,{10}^{5} [/latex] [latex] 8.766\,×\,{10}^{3} [/latex] 365.25 1
Speed
m/s cm/s ft/s mi/h
1 meter/second 1 102 3.281 2.237
1 centimeter/second 10−2 1 [latex] 3.281\,×\,{10}^{-2} [/latex] [latex] 2.237\,×\,{10}^{-2} [/latex]
1 foot/second 0.3048 30.48 1 0.6818
1 mile/hour 0.4470 44.70 1.467 1

Acceleration

[latex] 1\,{\text{m/s}}^{2}=100\,{\text{cm/s}}^{2}=3.281\,{\text{ft/s}}^{2} [/latex]

[latex] 1\,{\text{cm/s}}^{2}=0.01\,{\text{m/s}}^{2}=0.03281\,{\text{ft/s}}^{2} [/latex]

[latex] 1\,{\text{ft/s}}^{2}=0.3048\,{\text{m/s}}^{2}=30.48\,{\text{cm/s}}^{2} [/latex]

[latex] 1\,\text{mi/h}·\text{s}=1.467\,{\text{ft/s}}^{2} [/latex]

Mass
kg g slug u
1 kilogram 1 103 [latex] 6.852\,×\,{10}^{-2} [/latex] [latex] 6.024\,×\,{10}^{26} [/latex]
1 gram 10−3 1 [latex] 6.852\,×\,{10}^{-5} [/latex] [latex] 6.024\,×\,{10}^{23} [/latex]
1 slug 14.59 [latex] 1.459\,×\,{10}^{4} [/latex] 1 [latex] 8.789\,×\,{10}^{27} [/latex]
1 atomic mass unit [latex] 1.661\,×\,{10}^{-27} [/latex] [latex] 1.661\,×\,{10}^{-24} [/latex] [latex] 1.138\,×\,{10}^{-28} [/latex] 1
1 metric ton 1000
Force
N dyne lb
[latex] 1 [/latex] newton 1 105 0.2248
[latex] 1 [/latex] dyne 10−5 1 [latex] 2.248\,×\,{10}^{-6} [/latex]
[latex] 1 [/latex] pound 4.448 [latex] 4.448\,×\,{10}^{5} [/latex] 1
Pressure
Pa dyne/cm2 atm cmHg lb/in.2
*Where the acceleration due to gravity is [latex] 9.80665\,{\text{m/s}}^{2} [/latex] and the temperature is [latex] 0\text{°}\text{C} [/latex]
1 pascal 1 10 [latex] 9.869\,×\,{10}^{-6} [/latex] [latex] 7.501\,×\,{10}^{-4} [/latex] [latex] 1.450\,×\,{10}^{-4} [/latex]
1 dyne/centimeter2 10−1 1 [latex] 9.869\,×\,{10}^{-7} [/latex] [latex] 7.501\,×\,{10}^{-5} [/latex] [latex] 1.450\,×\,{10}^{-5} [/latex]
1 atmosphere [latex] 1.013\,×\,{10}^{5} [/latex] [latex] 1.013\,×\,{10}^{6} [/latex] 1 76 14.70
1 centimeter mercury* [latex] 1.333\,×\,{10}^{3} [/latex] [latex] 1.333\,×\,{10}^{4} [/latex] [latex] 1.316\,×\,{10}^{-2} [/latex] 1 0.1934
1 pound/inch2 [latex] 6.895\,×\,{10}^{3} [/latex] [latex] 6.895\,×\,{10}^{4} [/latex] [latex] 6.805\,×\,{10}^{-2} [/latex] 5.171 1
1 bar 105
1 torr 1 (mmHg)
Work, Energy, Heat
J erg ft.lb
1 joule 1 107 0.7376
1 erg 10−7 1 [latex] 7.376\,×\,{10}^{-8} [/latex]
1 foot-pound 1.356 [latex] 1.356\,×\,{10}^{7} [/latex] 1
1 electron-volt [latex] 1.602\,×\,{10}^{-19} [/latex] [latex] 1.602\,×\,{10}^{\text{-12}} [/latex] [latex] 1.182\,×\,{10}^{-19} [/latex]
1 calorie 4.186 [latex] 4.186\,×\,{10}^{7} [/latex] 3.088
1 British thermal unit [latex] 1.055\,×\,{10}^{3} [/latex] [latex] 1.055\,×\,{10}^{10} [/latex] [latex] 7.779\,×\,{10}^{2} [/latex]
1 kilowatt-hour [latex] 3.600\,×\,{10}^{6} [/latex]
eV cal Btu
1 joule [latex] 6.242\,×\,{10}^{18} [/latex] 0.2389 [latex] 9.481\,×\,{10}^{-4} [/latex]
1 erg [latex] 6.242\,×\,{10}^{11} [/latex] [latex] 2.389\,×\,{10}^{-8} [/latex] [latex] 9.481\,×\,{10}^{-11} [/latex]
1 foot-pound [latex] 8.464\,×\,{10}^{18} [/latex] 0.3239 [latex] 1.285\,×\,{10}^{-3} [/latex]
1 electron-volt 1 [latex] 3.827\,×\,{10}^{-20} [/latex] [latex] 1.519\,×\,{10}^{-22} [/latex]
1 calorie [latex] 2.613\,×\,{10}^{19} [/latex] 1 [latex] 3.968\,×\,{10}^{-3} [/latex]
1 British thermal unit [latex] 6.585\,×\,{10}^{21} [/latex] [latex] 2.520\,×\,{10}^{2} [/latex] 1

Power

[latex] 1\,\text{W}=1\,\text{J/s} [/latex]

[latex] 1\,\text{hp}=746\,\text{W}=550\,\text{ft}·\text{lb/s} [/latex]

[latex] 1\,\text{Btu/h}=0.293\,\text{W} [/latex]

Angle

[latex] 1\,\text{rad}=57.30\text{°}=180\text{°}\text{/}\text{π} [/latex]

[latex] 1\text{°}=0.01745\,\text{rad}=\text{π}\text{/}180\,\text{rad} [/latex]

[latex] 1\,\text{revolution}=360\text{°}=2\text{π}\,\text{rad} [/latex]

[latex] 1\,\text{rev/min}(\text{rpm})=0.1047\,\text{rad/s} [/latex]