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Last updated on September 10th, 2019 at 03:22 am

In physics, you are frequently asked to convert between units of measurement. Conversion factors are therefore very important in physics. For example, you may be asked to measure the number of kilometers your school bus travels in an hour and may need to convert the result in a mile. A handy conversion factor table between different units is therefore very useful. Here we have listed some common conversion factors you may require while solving your physics problems. The download link is available at the bottom of this post.

## Mass :

1 tonne = 1000 kg

1 kg = 1000 gm

1 kg = 2.2046 pound (lb) = 6.022 x 10^{26} amu

1 lb = 453.6 gm

1 atomic mass unit (amu) = 1.6606 x 10^{-27} kg

1 amu = 931.50 MeV/c^{2}

1 electron mass = 9.11 x 10^{-31} kg = 9.11 x 10^{-28} g = 5.46 x 10^{-4} atomic mass unit (amu)

1 proton mass = 1.00728 atomic mass unit (amu)

1 neutron mass = 1.00866 atomic mass unit (amu)

An atomic mass unit is defined as 1/12 the mass of an carbon-12 atom, which has six protons and six neutrons in its nucleus.

## Length :

1 in = 2.54 cm

1 ft = 12 in = 30.48 cm

1 mile = 1.609 km

1 cm = 0.394 in

1 m = 3.28 ft = 39.37 in

1 km = 0.621 mile

1 astronomical unit (AU) = 1.50 x 10^{8} km

1 light year (LY) = 9.461 x 10^{12} km

1 parsec = approximately 3.26 light year (LY)

1 A = 0.1 nm

1 nm = 10^{-9} m

## Time :

1 Day= 86400 Sec

1 Year = 3.16×10^{7} Sec

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## Temperature :

°F = 9/5 x °C + 32

°C = (°F – 32) x 5/9

Absolute Temperature, Kelvin, K = °C + 273.15

0 K = -273.15 °C = -459.72 °F

## Area :

1 m^{2} = 10^{4} cm^{2 }= 10.76 ft^{2
}1 in^{2} = 0.00694 ft^{2}

1 ft^{2} = 144 in^{2}

1 mile^{2} = 2.59 km^{2}

## Volume :

1 in^{3} = 0.000579 ft^{3} = 16.4 cm^{3}

1 ft^{3} = 1728 in^{3} = 0.0283 m^{3}

1 m^{3} = 106 cm^{3} = 1000 L = 35.3 ft^{3}

1 liter (L) = 1000 cm^{3}

## Speed :

1 m/s = 3.28 ft/s= 2.24 mile/h

1 Km/h= 0.621 mile/h = 0.278 m/s

## Force and Pressure :

1 N = 10^{5} dyne = 0.2248 lb wt

1 lb wt = 4.4482 N

1 kg wt = 2.2046 lb wt

1 Pa = 1 N/m^{2}= 10 dyne/cm^{2 }= 9.869 × 10^{-6} atm

1 bar = 100 kPa

1 atm = 1.01325×10^{5} Pa = 76 cm-Hg

1 atm = 29.9 in-Hg

1 atm = 33.8 ft Water

1 torr = 1 mm Hg = 133.32 Pa

1 atmosphere (atm) = 1.01325 × 10^{6} dynes/cm^{2} = 14.70 lbwt/in^{2}

## Energy and Power :

1 Joule =10^{7} erg=0.239 Cal

1 KW-h= 3.6×10^{6} Joule

1 cal= 4.186 J = 3.968 × 10^{-3} Btu

1 eV = 1.602×10^{-19} J

1 Btu (British thermal unit) = 778 ft lb-wt = 1055 joules = 0.293 watt-hr

1 kilowatt hour (kw hr) = 3.60 × 10^{6} joule = 860 kcal = 3413 Btu

1 electron volt (ev) = 1.602 × 10^{-19} joule

1 Horse Power (hp)= 745.7 Watt = 550 ft lb wt/sec

1 Watt = 1 Joule/Sec = 10^{7} erg/sec = 0.2389 Cal/sec

1 watt = 1.341 x 10^{-3} hp

1 Horse Power (hp) = 550 ft lbwt/sec = 33,000 ft lb-wt /min = 745.7 Watt

1 Kilo Watt (kw) = 1.341 hp = 737.6 ft lbwt/sec = 0.9483 Btu/Sec

## Magnetism :

1 Tesla= 1 Wb/m^{2} = 10^{4} gauss

## Radioactivity :

1 curie = 3.70×10^{10} disintegrations/s = 3.70×10^{10} bequerels

**Download link —> ****Conversion Factors in Physics**

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Also, read List of Important Physical Constant in Physics.