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 Cement	Number of 25kg bags per m3	Answer
1600 kg/m3	(1600 (kg/m3) x 1 (m3))/25 (kg bags)	64 Bags