Length
km m mm mile yard ft in 10-3in
1 1000 106 0.6214 1094 3281 3.937 x 104 3.937 x 107
10-3 1 1000 6.214 x 10-4 1.0936 3.281 39.370 3.937 x 104
10-6 10-3 1 6.214 x 10-7 1.094 x 10-3 3.281 x 10-3 3.937 x 10-2 39.37
1.6094 1609.4 1.609 x 106 1 1760 5280 63360 6.336 x 107
9.144 x 10-4 0.9144 914.41 5.682 x 10-4 1 3 36 36000
3.084 x 10-4 0.3048 304.8 1.894 x 10-4 0.3333 1 12 12000
2.54 x 10-5 0.0254 25.4 1.578 x 10-5 2.778 x 10-2 8.333 x 10-2 1 1000
2.54 x 10-8 2.54 x 10-5 0.0254 1.578 x 10-8 2.778 x 10-5 8.333 x 10-5 10-3 1

Example: to convert 10 miles to kilometres, find 1 mile in the Length table. Numbers on horizontal lines are equal. 1 mile = 1.6094 km; 10 miles = 16.094 km.

Area
km2

 m2

 cm2

 mm2

 sq. mile

 acre

 yd2

 ft2

 in2
1 106 1010 1012 0.38612 247.11 1.196 x 106 1.076 x 107 1.550 x 109
10-6 1 104 106 3.86 x 10-7 2.471 x 10-4 1.1960 10.764 1550
10-10 10-4 1 100 3.86 x 10-11 2.471 x 10-8 1.196 x 10-4 1.076 x 10-3 0.1550
10-12 10-6 10-2 1 3.86 x 10-13 2.47 x 10-10 1.196 x 10-6 1.076 x 10-5 1.550 x 10-3
2.590 2.59 x 106 2.59 x 1010 2.59 x 1012 1 639.96 3.097 x 106 2.788 x 107 4.01 x 109
4.047 x 10-3 4047 4.047 x 107 4.047 x 109 1.563 x 10-3 1 4840 43560 6.273 x 106
8.36 x 10-7 0.8361 8361 8.36 x 105 3.228 x 10-7 2.066 x 10-4 1 9 1296
9.29 x 10-8 9.29 x 10-2 929.0 92900 3.587 x 10-8 2.296 x 10-5 0.1111 1 144
6.45 x 10-10 6.45 x 10-4 6.4516 645.16 2.491 x 10-10 1.594 x 10-7 7.716 x 10-4 6.944 x 10-3 1

Volume
m3 litre cm3 or
ml		 yd3 ft3 in3 UK gallon US gallon
1

 103 106 1.3079 35.311 61013 219.97 264.17
10-3 1 103 1.308 x 10-3 3.531 x 10-2 61.013 0.2200 0.2642
10-6 10-3 1 1.308 x 10-6 3.531 x 10-5 6.101 x 10-2 2.199 x 10-4 2.642 x 10-4
0.7646 764.6 7.646 x 105 1 27 46650 168.19 201.99
2.832 x 10-2 28.32 2.832 x 10-4 3.704 x 10-2 1 1728 6.229 7.481
1.639 x 10-5 1.639 x 10-2 16.387 2.144 x 10-5 5.787 x 10-4 1 3.605 x 10-3 4.329 x 10-3
4.546 x 10-3 4.546 4.546 x 103 5.946 x 10-3 0.1605 277.42 1 1.2008
3.785 x 10-3 3.785 3.785 x 103 4.951 x 10-3 0.1337 231.00 0.8327 1

Mass
tonne or Mg kg g UK ton US ton cwt lb oz
1 1000 106 0.9832 1.1011 19.66 2.205 x 103 3.527 x 104
10-3 1 1000 9.832 x 10-4 1.101 x 10-3 1.966 x 10-2 2.2046 35.274
10-6 10-3 1 9.832 x 10-7 1.101 x 10-6 1.966 x 10-5 2.204 x 10-3 3.527 x 10-2
1.017 1017 1.017 x 106 1 1.12 20 2240 35840
0.9081 908.1 9.081 x 105 0.8928 1 17.856 2000 32000
5.085 x 10-2 50.85 5.085 x 104 0.05 0.0560 1 112 1792
4.536 x 10-4 0.4536 453.6 4.46 x 10-4 5 x 10-4 8.92 x 10-3 1 16
2.835 x 10-5 2.835 x 10-2 28.349 2.79 x 10-5 3.125 x 10-5 5.580 x 10-4 6.25 x 10-2 1

Density
tonne/m3 or Mg/m3 or g/cm3 kg/m3 lb/in3 UK ton/yd2 US ton/yd2 lb/ft3
1 1000 0.03613 0.75247 0.8428 62.423
10-3 1 3.613 x 10-5 7.525 x 10-4 8.428 x 10-4 6.243 x 10-2
27.680 27680 1 20.828 23.328 1.728 x 103
1.3289 1.328 x 103 4.801 x 10-2 1 1.12 82.955
1.1865 1.186 x 103 4.287 x 10-2 0.8929 1 74.074
1.602 x 10-2 16.019 5.787 x 10-4 1.205 x 10-2 1.35 x 10-2 1

Force and Weight
MN kN N kgf tonf lbf
1 1000 106 1.0196 x 105 100.4 2.248 x 105
10-3 1 103 101.96 0.1004 224.82
10-6 10-3 1 0.10196 1.004 x 10-4 0.2248
9.807 x 10-6 9.807 x 10-3 9.807 1 9.842 x 10-4 2.2048
9.964 x 10-3 9.964 9964 1016 1 2240
4.448 x 10-6 4.448 x 10-3 4.448 0.45355 4.464 x 10-4 1

Pressure, Stress & Modulus of Elasticity
MN/m2 or MPa kN/m2 or kPa kp or kgf/cm2 bar atm m H2O ft H2O mm Hg tonf/ft2 psi or lbf/in2
1 1000 10.197 10.000 9.869 102.2 335.2 7500.6 9.320 145.04
0.001 1 1.019 x 10-2 0.0100 9.87 x 10-3 0.1022 0.3352 7.5006 0.0093 0.14504
9.807 x 10-2 98.07 1 0.9807 0.9678 10.017 32.866 735.56 0.9139 14.223
0.100 100.0 1.0197 1 0.9869 10.215 33.515 750.06 0.9320 14.504
0.1013 101.33 1.0332 1.0132 1 10.351 33.959 760.02 0.9444 14.696
9.788 x 10-3 9.7885 9.983 x 10-2 9.789 x 10-2 9.661 x 10-2 1 3.2808 73.424 9.124 x 10-2 1.4198
2.983 x 10-3 2.9835 3.043 x 10-2 2.984 x 10-2 2.945 x 10-2 0.3048 1 22.377 2.781 x 10-2 0.43275
1.333 x 10-4 0.1333 1.3595 x 10-3 1.333 x 10-3 1.315 x 10-3 1.362 x 10-2 4.469 x 10-2 1 1.243 x 10-3 1.934 x 10-2
0.1073 107.3 1.0942 1.0730 1.0589 10.960 35.960 804.78 1 15.562
6.895 x 10-3 6.895 7.031 x 10-2 6.895 x 10-2 6.805 x 10-2 0.7043 2.3108 51.714 6.426 x 10-2 1
4.788 x 10-5 4.788 x 10-2 4.883 x 10-4 4.788 x 10-4 4.725 x 10-4 4.891 x 10-3 1.605 x 10-2 0.3591 4.464 x 10-4 6.944 x 10-3

Permeability
m/s cm/s m/year Darcy ft/yr ft/day
1 100 3.156 x 107 1.04 x 105 1.035 x 108 2.835 x 105
0.01 1 3.156 x 105 1.04 x 103 1.035 x 106 2.834 x 103
3.169 x 10-8 3.169 x 10-6 1 3.28 x 103 3.281 8.982 x 10-3
9.66 x 10-6 9.66 x 10-4 304 1 1000 2.74
9.658 x 10-9 9.659 x 10-7 0.3048 10-3 1 2.738 x 10-3
3.527 x 10-6 3.527 x 10-4 111.33 0.365 365.25 1
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Last modified: March 17, 2004