In this post, we’ve gathered some useful information that will help quantity surveyors do daily works such as preparing bill of quantities, take off, estimating and more.
Metric Conversion Factors
Length Metric Conversion
1 Inch=25.4 Millimetre
1 Foot=0.3048 Metre
1 Yard=0.9144 metre
1 Mile=1.6093 Kilometer
1 Acre=0.4047 Hectare
1 Pound=0.4536 Kilogram
1 Millimetre=0.0394 Inch
1 Metre=3.2808 Foot
1 Metre=1.0936 Yard
Area Metric Conversion
1 ft2 =0.093 m2
1 yd2=0.836 m2
1 acre=0.405 ha (1 ha or hectare = 10000 m2)
1 mile2=2.590 m2
1 m2=10.764 ft2 = 1.196 yd2 (approximately 1.2 yd2)
1 ha =2.471 acres (approximately 2½ acres)
1 km2=0.386 mile2
Volume Metric Conversion
1 ft3 =0.028 m3
1 yd3=0.765 m3
1 m3=35.315 ft3 = 1.308 yd3 (approximately 1.3 yd3)
1 ft3 =28.32 litres (1000 litres=1 m3)
1 gal=4.546 litres
1 litre=0.220 gal (approximately 4½ litres to the gallon)
Mass Metric Conversion
1 lb=0.454 kg (kilogram)
1 cwt=50.80 kg (approximately 50 kg)
1 ton=1.016 tonnes (1 tonne= 1000 kg =0.984 ton)
1 kg=2.205 lb (approximately 2 1/5 lb)
The Weight of Steel for Different Bars Dia
6mm=0.222kg
8mm=0.395kg
10mm=0.616kg
12mm=0.888kg
16mm=1.578kg
20mm=2.466kg
25mm=3.853kg
32mm=6.313kg
40mm=9.865kg
Concrete Grade Materials Mix Ratio
M5=1:4:8
M10=1:3:6
M15=1:2:4
M20=1:1.5:3
M25=1:1:2
Clear Cover to Main Reinforcement
Footings: 50 mm
Raft Foundation Top: 50 mm
Raft Foundation Bottom/Sides: 75mm
Strap Beam: 50mm
Grade Slab:20mm
Column:40mm