1:2:4 means 1 part cement, 2 parts sand, 4 parts aggregate by volume. Stronger mixes use more cement relative to aggregate.

Construction Calculators

Cement Calculator – How Much Cement Do You Need?

Calculate the amount of cement needed for your project based on volume and mix ratio.

Length (ft)

Width (ft)

Depth/Thickness (inches)

Mix Ratio (Cement:Aggregate)

Volume (cu ft)0.00

Volume (cu yd)0.00

Cement Needed0.00 cu ft

Bags (94 lb)0

Cement Calculator Formula

Volume = Length × Width × Depth

Dry Volume = Wet Volume × 1.54

Cement = Dry Volume / Sum of Mix Ratio

Slab: 20ft × 10ft × 4in, Mix: 1:2:4

Volume = 20 × 10 × (4/12) = 66.67 cu ft

Bags ≈ 42 bags (94 lb each)

What is mix ratio?

Calculate concrete volume needed for slabs, footings, columns, and walls.

Calculate the amount of sand needed for your project in tons or cubic yards.

Calculate the number of bricks needed for a wall or project including mortar joints.