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\times {10}^{-2}[/latex] 2.540 [latex]2.540\times {10}^{-5}[/latex]
1 foot 0.3048 30.48 [latex]3.048\times {10}^{-4}[/latex]
1 mile 1609 [latex]1.609\times {10}^{4}[/latex] 1.609
1 angstrom 10−10
1 fermi 10−15
1 light-year [latex]9.460\times {10}^{12}[/latex]
in. ft mi
1 meter 39.37 3.281 [latex]6.214\times {10}^{-4}[/latex]
1 centimeter 0.3937 [latex]3.281\times {10}^{-2}[/latex] [latex]6.214\times {10}^{-6}[/latex]
1 kilometer [latex]3.937\times {10}^{4}[/latex] [latex]3.281\times {10}^{3}[/latex] 0.6214
1 inch 1 [latex]8.333\times {10}^{-2}[/latex] [latex]1.578\times {10}^{-5}[/latex]
1 foot 12 1 [latex]1.894\times {10}^{-4}[/latex]
1 mile [latex]6.336\times {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\times {10}^{-2}[/latex] [latex]2.778\times {10}^{-4}[/latex] [latex]1.157\times {10}^{-5}[/latex] [latex]3.169\times {10}^{-8}[/latex]
1 minute 60 1 [latex]1.667\times {10}^{-2}[/latex] [latex]6.944\times {10}^{-4}[/latex] [latex]1.901\times {10}^{-6}[/latex]
1 hour 3600 60 1 [latex]4.167\times {10}^{-2}[/latex] [latex]1.141\times {10}^{-4}[/latex]
1 day [latex]8.640\times {10}^{4}[/latex] 1440 24 1 [latex]2.738\times {10}^{-3}[/latex]
1 year [latex]3.156\times {10}^{7}[/latex] [latex]5.259\times {10}^{5}[/latex] [latex]8.766\times {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\times {10}^{-2}[/latex] [latex]2.237\times {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}\cdot \text{s}=1.467\,{\text{ft/s}}^{2}[/latex]

Mass
kg g slug u
1 kilogram 1 103 [latex]6.852\times {10}^{-2}[/latex] [latex]6.024\times {10}^{26}[/latex]
1 gram 10−3 1 [latex]6.852\times {10}^{-5}[/latex] [latex]6.024\times {10}^{23}[/latex]
1 slug 14.59 [latex]1.459\times {10}^{4}[/latex] 1 [latex]8.789\times {10}^{27}[/latex]
1 atomic mass unit [latex]1.661\times {10}^{-27}[/latex] [latex]1.661\times {10}^{-24}[/latex] [latex]1.138\times {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\times {10}^{-6}[/latex]
[latex]1[/latex] pound 4.448 [latex]4.448\times {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^\circ\text{C}[/latex]
1 pascal 1 10 [latex]9.869\times {10}^{-6}[/latex] [latex]7.501\times {10}^{-4}[/latex] [latex]1.450\times {10}^{-4}[/latex]
1 dyne/centimeter2 10−1 1 [latex]9.869\times {10}^{-7}[/latex] [latex]7.501\times {10}^{-5}[/latex] [latex]1.450\times {10}^{-5}[/latex]
1 atmosphere [latex]1.013\times {10}^{5}[/latex] [latex]1.013\times {10}^{6}[/latex] 1 76 14.70
1 centimeter mercury* [latex]1.333\times {10}^{3}[/latex] [latex]1.333\times {10}^{4}[/latex] [latex]1.316\times {10}^{-2}[/latex] 1 0.1934
1 pound/inch2 [latex]6.895\times {10}^{3}[/latex] [latex]6.895\times {10}^{4}[/latex] [latex]6.805\times {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\times {10}^{-8}[/latex]
1 foot-pound 1.356 [latex]1.356\times {10}^{7}[/latex] 1
1 electron-volt [latex]1.602\times {10}^{-19}[/latex] [latex]1.602\times {10}^{\text{-12}}[/latex] [latex]1.182\times {10}^{-19}[/latex]
1 calorie 4.186 [latex]4.186\times {10}^{7}[/latex] 3.088
1 British thermal unit [latex]1.055\times {10}^{3}[/latex] [latex]1.055\times {10}^{10}[/latex] [latex]7.779\times {10}^{2}[/latex]
1 kilowatt-hour [latex]3.600\times {10}^{6}[/latex]
eV cal Btu
1 joule [latex]6.242\times {10}^{18}[/latex] 0.2389 [latex]9.481\times {10}^{-4}[/latex]
1 erg [latex]6.242\times {10}^{11}[/latex] [latex]2.389\times {10}^{-8}[/latex] [latex]9.481\times {10}^{-11}[/latex]
1 foot-pound [latex]8.464\times {10}^{18}[/latex] 0.3239 [latex]1.285\times {10}^{-3}[/latex]
1 electron-volt 1 [latex]3.827\times {10}^{-20}[/latex] [latex]1.519\times {10}^{-22}[/latex]
1 calorie [latex]2.613\times {10}^{19}[/latex] 1 [latex]3.968\times {10}^{-3}[/latex]
1 British thermal unit [latex]6.585\times {10}^{21}[/latex] [latex]2.520\times {10}^{2}[/latex] 1

Power

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

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

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

Angle

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

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

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

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

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