ABSTRACT
Millimetre mm 1 in = 25.4mm 1mm = 0.0394 in Centimetre cm 1 in = 2.54 cm 1 cm = 0.3937 in Metre m 1 ft = 0.3048m 1m = 3.2808 ft
1 yd = 0.9144m = 1.0936 yd Kilometre km 1mile = 1.6093 km 1km = 0.6214mile
Note: 1 cm = 10mm 1 ft = 12 in 1m = 1 000mm 1 yd = 3 ft 1 km = 1 000m 1mile = 1 760 yd
Area Unit Conversion factors
Square Millimetre mm2 1 in2 = 645.2mm2 1mm2 = 0.0016 in2
Square Centimetre cm2 1 in2 = 6.4516 cm2 1 cm2 = 1.1550 in2
Square Metre m2 1 ft2 = 0.0929m2 1m2 = 10.764 ft2
1 yd2 = 0.8361m2 1m2 = 1.1960 yd2
Square Kilometre km2 1mile2 = 2.590km2 1 km2 = 0.3861mile2
Note: 1 cm2 = 100mm2 1 ft2 = 144 in2
1m2 = 10 000 cm2 1 yd2 = 9 ft2
1 km2 = 100 hectares 1 acre = 4 840 yd2
1mile2 = 640 acres
Volume Unit Conversion factors
Cubic Centimetre cm3 1 cm3 = 0.0610 in3 1 in3 = 16.387 cm3
Cubic Decimetre dm3 1 dm3 = 0.0353 ft3 1 ft3 = 28.329 dm3
Cubic Metre m3 1m3 = 35.3147 ft3 1 ft3 = 0.0283m3
1m3 = 1.3080 yd3 1 yd3 = 0.7646m3
Litre l 1 l = 1.76 pint 1 pint = 0.5683 l = 2.113 US pt = 0.4733 US l
Note: 1 dm3 = 1 000 cm3 1 ft3 = 1 728 in3 1 pint = 20 fl oz 1m3 = 1 000 dm3 1 yd3 = 27 ft3 1 gal = 8 pints 1 l = 1 dm3
Mass Unit Conversion factors
Milligram mg 1mg = 0.0154grain 1 grain = 64.935mg Gram g 1g = 0.0353 oz 1 oz = 28.35 g Kilogram kg 1 kg = 2.2046 lb 1 lb = 0.4536 kg Tonne t 1 t = 0.9842 ton 1 ton = 1.016 t
Note: 1g = 1000mg 1 oz = 437.5 grains 1 cwt = 112 lb 1 kg = 1000g 1 lb = 16 oz 1 ton = 20 cwt 1 t = 1000 kg 1 stone = 14 lb
Force Unit Conversion factors
Newton N 1 lbf = 4.448 N 1kgf = 9.807 N Kilonewton kN 1 lbf = 0.004448 kN 1 ton f = 9.964 kN Meganewton MN 100 tonf = 0.9964 MN
Pressure and stress Unit Conversion factors
Kilonewton per square metre kN/m2 1 lbf/in2 = 6.895 kN/m2
1 bar = 100 kN/m2
Meganewton per square metre MN/m2 1 tonf/ft2 = 107.3 kN/m2 = 0.1073 MN/m2
1 kgf/cm2 = 98.07 kN/m2
1 lbf/ft2 = 0.04788 kN/m2
Coefficient of consolidation (Cv) or swelling
Unit Conversion factors
Square metre per year m2/year 1 cm2/s = 3 154m2/year 1 ft2/year = 0.0929m2/year
Coefficient of permeability Unit Conversion factors
Metre per second m/s 1 cm/s = 0.01m/s Metre per year m/year 1 ft/year = 0.3048m/year
= 0.9651 × (10)8m/s
Temperature Unit Conversion factors
Degree Celsius °C °C = 5/9 × (°F − 32) °F = (9 × °C)/ 5 + 32
km/h m/min mph fpm
1 16.7 0.6 54.7 2 33.3 1.2 109.4 3 50.0 1.9 164.0 4 66.7 2.5 218.7 5 83.3 3.1 273.4
6 100.0 3.7 328.1 7 116.7 4.3 382.8 8 133.3 5.0 437.4 9 150.0 5.6 492.1
10 166.7 6.2 546.8
11 183.3 6.8 601.5 12 200.0 7.5 656.2 13 216.7 8.1 710.8 14 233.3 8.7 765.5 15 250.0 9.3 820.2
16 266.7 9.9 874.9 17 283.3 10.6 929.6 18 300.0 11.2 984.3 19 316.7 11.8 1038.9 20 333.3 12.4 1093.6
21 350.0 13.0 1148.3 22 366.7 13.7 1203.0 23 383.3 14.3 1257.7 24 400.0 14.9 1312.3 25 416.7 15.5 1367.0
26 433.3 16.2 1421.7 27 450.0 16.8 1476.4 28 466.7 17.4 1531.1 29 483.3 18.0 1585.7 30 500.0 18.6 1640.4
31 516.7 19.3 1695.1 32 533.3 19.9 1749.8 33 550.0 20.5 1804.5 34 566.7 21.1 1859.1 35 583.3 21.7 1913.8
36 600.0 22.4 1968.5 37 616.7 23.0 2023.2 38 633.3 23.6 2077.9 39 650.0 24.2 2132.5 40 666.7 24.9 2187.2
km/h m/min mph fpm
41 683.3 25.5 2241.9 42 700.0 26.1 2296.6 43 716.7 26.7 2351.3 44 733.3 27.3 2405.9 45 750.0 28.0 2460.6
46 766.7 28.6 2515.3 47 783.3 29.2 2570.0 48 800.0 29.8 2624.7 49 816.7 30.4 2679.4 50 833.3 31.1 2734.0
