Spike's Calculators

Concrete Calculators

Online concrete calculators to estimate how much concrete you will need. Includes ready-mix, pre-mix and self-mix concrete calculators.

Concrete Volume Calculator

Estimate the amount of ready-mix concrete needed.

Concrete Pre-Mix in Bags

Use these concrete calculators to calculate the number of bags you need.

Self Mix Concrete

Mix concrete by hand using cement, sand and rocks.


Calculate the number of rebar lengths needed for concrete reinforcement.

Concrete Weight

Calculate the weight of the concrete.

Concrete Volume and Cost Calculators

Calculate concrete needed plus cost for cubic yards and cubic metres

Concrete Needed from Square Footage

Concrete volume using square footage/metres of an area


Convert between weight and volume measurements used with concrete.

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