The upper end of nominal (by-volume) mixing. At and above M25, a design mix by weight with tested materials is preferred for structural work.
Mix ratio
1 : 1 : 2
Cement : Sand : Aggregate
Proportions & strength
M25 nominal concrete: proportions by volume, typical compressive strength and use.
Designation
M25
Ratio (by volume)
1 : 1 : 2
Cement
1 part
Sand
1 part
Aggregate
2 parts
Typical compressive strength
3,625 psi · 25 MPa
Typical use
Reinforced footings, columns, structural slabs.
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 M25 is used
The upper end of nominal (by-volume) mixing. At and above M25, a design mix by weight with tested materials is preferred for structural work.
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.