Concrete Block Calculator
Estimate the concrete blocks and mortar needed for a wall.
Enter your values to see the result.
Estimates only. Measure carefully and check quantities with your supplier before ordering.
Continue your work
- Brick Calculator — Estimate a brick wall instead.
- Cement Calculator — Mix mortar or concrete.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Concrete Block Calculator
Estimate the concrete blocks and mortar needed for a wall.
- 1 Enter the wall length and height and any door or window area.
- 2 Choose the block size.
- 3 Read the number of blocks and mortar bags.
Example and practical tips
A 40 × 8 ft wall with standard 8 × 8 × 16 in blocks needs about 240 blocks and 8 bags of mortar mix, including 5% waste.
Frequently asked questions
How many blocks are in 100 square feet?
About 113 standard 8 × 16 in blocks with 3/8 in joints.
Is grout for cores included?
No. Reinforced walls need extra grout to fill the block cores.
Report an issue
Something broken or not quite right? Tell us and we will look into it.