Block and brick bags

Mortar Calculator

Estimate mortar bags using your unit count and coverage per bag.

US units 10% default waste Bag and yard estimates

Mortar estimate

Units and coverage

Estimate assumptions

Estimates are for planning and ordering only.
Bag counts are rounded up to whole bags.
Ready-mix yards are rounded up to the nearest 0.25 cubic yard.
Default waste is 10%. Increase it for uneven excavation, spillage, or complex forms.
Verify structural work with a contractor, engineer, or supplier before pouring.

Coverage-based mortar estimate

Mortar coverage varies by unit size, joint thickness and mason technique. This page lets you enter the coverage per bag instead of hiding that assumption.

Use the coverage printed by your mortar product or supplier when possible.

Starter coverage assumptions

Concrete blocksA planning default of 35 blocks per bag is used unless you change it.
BricksChange coverage per bag to match your brick size and joint thickness.
WasteDefault waste is 10%.

Common next purchases

Concrete mix Rebar Tube forms Mixing tools Trowels and floats

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FAQ

How many blocks per bag of mortar?

Coverage varies. This calculator defaults to 35 units per bag so you can adjust it to your product.

Why do I enter coverage per bag?

Mortar coverage changes with unit size and joint thickness. Exposing the assumption makes the result more trustworthy.

Does this calculate concrete?

No. This page estimates mortar bags for block or brick work.