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# Conversion Tables

Have you ever struggled to convert units of measure from one to another or m³ of a material to kg ?

For example, concrete is measured as m³, but if mixing on site the separate constituents are purchased by weight and despite having used metric measurement for over 40 years, a number of imperial units are still widely popular and in regular use.

RBC are pleased to assist with a number of conversion tables.

(Material density is based upon average moisture content)

Length

 1in = 25.4mm 1mm = 0.0394in 1 ft = 0.3048m 1m = 3.2808 ft 1 yd = 0.9144m 1m = 1.0936yd 1mile = 1.6093km 1km = 0.6214mile

Area

 1 inch2 = 645.2 mm2 1mm2 = 0.0016 in2 1 foot2 = 0.0929 m2 1 metre2 = 10.764 ft2 1 yard2 = 0.8361 m2 1 m2 = 1.0936 yd2 1 mile2 = 2.590 km2 1 km2 = 0.3861 mile2 1 acre = 4840 yrd2 1 Hectare = 10,000 m2 1 acre = 0.4047 Hectare 1 Hectare = 2.47105 acre

Cubic

 1 in3 = 16.387 cm3 1 cm3 = 0.0610 in3 1 ft3 = 0.0283 m3 1 m3 = 35.3147 ft3 1 yd3 = 0.7646 m3 1 m3 = 1.3080 yd3 1 pint = 0.5683 L 1 L = 1.760 pint

Mass

 1 oz = 28.350 g 1 g = 0.0353 oz 1 lb = 0.4536 kg 1 kg = 2.2046 lb 1 ton = 1.016 t 1 t = 0.9842 ton

Force

 1 lbf = 4.448 N 1 N = 0.2248 lbf 1 tonf = 9.964 kN 1 kN = 0.1004 tonf

Weights of some common materials

 Ashes = 610 kg/m3 Lime (ground) = 761 kg/m3 Portland Cement = 1600 kg/m3 Sand (dry) = 1707 kg/m3 Chalk = 2406 kg/m3 Sand (wet) = 1831 kg/m3 Chippings (stone) = 1762 kg/m3 Water = 1000 kg/m3 Ballast = 2241 kg/m3 Pitch = 1152 kg/m3 Gravel = 1790 kg/m3

## Example of calculation (Bags of cement per m3)

Density of Portland CementNumber of 25kg bags per m3Answer
1600 kg/m3(1600 (kg/m3) x 1 (m3))/25 (kg bags)64 Bags