Concrete Wall Calculator

By Vinod Kondeti · Updated October 14, 2026

A poured wall is a slab standing on its edge: length × height × thickness. Enter height in feet and thickness in inches, which is how wall forms are usually specified.

Wall length (ft)Wall height (ft)Wall thickness (in)Quantity (pcs)Waste / extra (%)

Cost estimate (optional, enter your local prices)

Price per 80 lb bag ($)Ready-mix price per yd³ ($)Delivery / short-load fee ($)

Cubic yards	–
Cubic feet	–
Cubic meters	–
80 lb bags (0.60 ft³ each)	–
60 lb bags (0.45 ft³ each)	–
40 lb bags (0.30 ft³ each)	–
Cost in 80 lb bags	–
Cost as ready-mix	–

Working: –

How do I measure for a wall pour?

Subtract window or door openings by running them as a separate wall and taking the difference.
For the footing under the wall, use the footing calculator.
Forms can bow outward under the weight of wet concrete, so a waste allowance helps.

Wall concrete questions

How much concrete in a 20 ft × 4 ft wall, 8 in thick?

20 × 4 × (8÷12) = 53.3 ft³ = 1.98 yd³ before waste.

Does this work for block walls?

No. For a hollow block wall you only fill the cores, so use the block maker's grout-fill figures instead.

Bag yields: 0.30 / 0.45 / 0.60 ft³ for 40 / 60 / 80 lb standard concrete mix (manufacturer data sheets). The concrete guide has the formulas and worked examples.

Concrete Wall Calculator

How do I measure for a wall pour?

Wall concrete questions

How much concrete in a 20 ft × 4 ft wall, 8 in thick?

Does this work for block walls?

Sources

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