Length
1 micron = 0.001 mm
1 mm = 0.0394 in = 0.001 m
1 cm = 0.394 in = 10 mm = 0.01 m
1 m = 3.28 ft = 1.094 yd
1 in = 25.83 mm = 2.54 cm
1 ft = 0.305 m = 12 in
1 yd = 0.915 m = 3 ft
Weight
1 g = 0.0353 oz
1 kg = 1 000 g = 2.205 lb
50 kg = 110.25 lb
1 000 kg = 1 mt
1 mt = 0.9842 UK 1/t = 1.102 US t
1 oz = 28.349 g
1 lb = 16 oz = 453.59 g
1 UK 1/cwt = 112 lb = 50.80 kg
1 US cwt = 100 lb = 45.36 kg
1 UK 1/t = 20 UK 1/cwt = 2 240 lb = 1.016 mt = 1.12 US t
Volume
1 litre = 1 000 ml = 0.220 UK 1/gallon = 0.264 US gallon1m3 = 35.315 ft3 = 1.308 yd3
1m3 = 1 000 litres = 219.97 UK 1/gallons = 264.16 US gallons
1 ft3 = 0.02832m3 = 6.229 UK 1/gallons = 28.316 litres
1 UK 1/gallon = 4.546 litres = 1.2009 US gallon
1 US gallon = 3.785 litres = 0.833 UK 1/ gallon
1 MGD (million UK 1/ gallons/day) = 694.44 GPM (UK 1/ gallons/minute)
1 MGD = 3.157 m3/minute = 3 157 litres/minute
1/'British' or 'Imperial' units
Area
1 m2 = 10.764 ft2 = 1.196 yd2
1 ha = 10 000 m2 = 2.471 acres
1 km2 = 100 ha = 0.386 mi2
1 ft2 = 0.0929 m2
1 yd2 = 0.836 m2
1 acre = 0.405 ha
1 mi2 = 640 acres = 2.59 km2
Temperature
Pressure
1 psi (lb/in2) = 70.307 g/cm2
1 atmosphere = 14.69 lb/in2 (psi) = 29.92 in Hg
1 atmosphere = 33.9 ft HO
Calorific Value
1 cal (calorie) = 4.184 joules = 0.003968 BTU 1/
1 kcal (kilocalorie) = 1 000 cal = 4 184 joules
1 Mcal (megacalorie) = 1 000 000 cal = 1 000 kcal
1 joule = 0.239 cal
1 BTU 1/= 252 cal = 778.16 ft lb = 1 055.124 joules
1/British Thermal Unit
Power
1 HP = 746 watts = 0.746 kw = 550 ft lb per second
1 kw = 1 000 watts
Other
1 m3 of water weighs 1 mt
B. COMMON FORMULAE
Areas 1/
Tiangle |
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Rectangle |
A = ab | |
Parallelogram |
A = ah | |
Trapezoid |
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Circle |
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Circumference |
C=2p r |
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Sphere |
A=4p R2=p d2 |
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Sector |
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Volumes 1/
Sphere |
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Regular Prism |
V= area of base × h | |
Regular Circular Cylinder |
V=p r2h | |
Regular Circular or Con |
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Frustrum of Any Pyramid |
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