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Basic Conversions a Civil Engineer on Site Must Learn

Basic Conversions a Civil Engineer on Site Must Learn basic must be learn.A unit of measurement is a defined magnitude of a quantity that it used as a standard for measurement for the same kind of quantity, such as measurements of length, weight, and volume.

  • 1 bag of cement = .0347 cum
  • 1 sqm = 10.76 sqft
  • 1 inch = 25.4 mm
  • Weight in Kilograms of Mild Steel (Sheet,grill etc.) = (Volume x Density of Mild Steel) = Length x Width x Thickness x 7850 kg/cum. Eg. 2.5 m x 1.25 m x .001 m x 7850 = 24.53 KGs……….. [ Keep a notice on the units ]
  • 1 tonne = 1000 KGs
  • 1 quintal = 100 KGs
  • 1 Acre = 43560 sq. ft = 4046.46 sqm
  • 1 cum = 35.32 cuft
  • Unit Weight of Steel Bar = D^2/162 where D is the diameter of the bar. Eg. 12 mm dia bars, unit weight = 12*12/162 = 0.89 kg/m. [Unit weight in this case is the weight of steel bar per meter ].
  • 1 ton and 1 tonne are different things. 1 ton is US ton which is 907.18 KGs. 1 tonne or 1 MT(usually referred as MT in BOQs) is 1000 KGs.
  • In some cases earthworks will be in % Cum wherein you will need to divide the amount by 100. Eg. Earth work in excavation of foundation trenches or drains, Qty = 24295 %cum Rate = Rs. 9161.6 Amount = 24295*9161.6/100.
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Standard conversion factors
INCH = 25.4 MILLIMETRE
FOOT = 0.3048 METRE
YARD = 0.9144 METRE
MILE = 1.6093 KILOMETER
ACRE = 0.4047 HECTARE
POUND = 0.4536 KILOGRAM
DEGREE FARENHEIT X 5/9 – 32 = DEGREE CELSIUS
MILLIMETRE= 0.0394 INCH
METRE = 3.2808FOOT
METRE = 1.0936YARD

Convert USCS into SI Units

USCS unit X Factor = SI unit SI symbol
Square foot X 0.0929 = Square meter M2
Cubic foot  X 0.2831 = Cubic meter M3
Pound per square inch X 6.894 = Kilopascal KPa
Pound force X 4.448 =  Newton Nu
Foot pound torque X 1.356 = Newton meter N-m
Kip foot X 1.355 = Kilonewton meter LN-m
Gallon per minute X 0.06309 = Liter per second L/s
Kip per square inch X 6.89 = Megapascal MPa

Basic Conversions a Civil Engineer on Site Must Learn useful for civil engineer in field work.

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