Concrete strength classes

M5 lean concrete

A very lean nominal mix used only as a clean, non-structural base beneath foundations. Not for any load-bearing element.

Mix ratio

1 : 5 : 10

Cement : Sand : Aggregate

Proportions & strength

Designation	M5
Ratio (by volume)	1 : 5 : 10
Cement	1 part
Sand	5 parts
Aggregate	10 parts
Typical compressive strength	725 psi · 5 MPa
Typical use	Blinding / levelling course under footings.

Planning reference. Strengths are typical values for a well-made mix at 28 days, not a guaranteed design strength. Structural work must follow your local building code and a qualified engineer's mix design.

Where M5 is used

A very lean nominal mix used only as a clean, non-structural base beneath foundations. Not for any load-bearing element.

Nominal mixes like this are proportioned by volume on site and suit general and domestic work. Anything structural — reinforced, load-bearing or engineered — should use a design mix proportioned by weight from tested materials.

Need quantities? The volume calculators give the cubic yards, cubic metres and bag counts for the pour this mix goes into.

Same family

Other concrete strength classes

M7.51 : 4 : 8Blinding, mass fill, non-structural pads.M101 : 3 : 6Levelling courses, path bedding, kerb backing.M151 : 2 : 4Paths, patios, shed and light slab bases.M201 : 1.5 : 3Driveways, footings, reinforced slabs (light).M251 : 1 : 2Reinforced footings, columns, structural slabs.M30Design mixStructural columns, beams, suspended slabs.