Mortar Calculator
Calculate mortar bags and sand for laying block, brick, or stone, adjusted for the joint thickness you are working to.
Formula and figures last reviewed by the Cosyslabs team · how we verify
Inputs
Result
Mortar bags (70 lb)
15
Sand needed
16.9 ft³
- Units
- 500 block
- Joint thickness
- 0.375 in
- Sand in cubic yards
- 0.63 yd³
Estimates only. Verify with a licensed contractor or supplier before purchasing. Rough Estimator! is not responsible for shortages, overages, or material variances. See our methodology for formulas and sources.
Formula
Bags = (units ÷ 100) × base rate × (joint ÷ 0.375) · base rate: 3 per 100 block, 7 per 100 brick, 10 per 100 stone
References
Related tools & materials
Don't forget
- Masonry sand
- Mortar mix
- Jointer tool
- Mixing tub
- Mason line
Also useful
Frequently asked questions
Roughly three 70-lb bags per 100 concrete blocks, seven per 100 bricks, and ten per 100 stone units, all at a 3/8-inch joint. Scale proportionally if your joint is thicker.
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Cosyslabs. (2026). Mortar Calculator. Rough Estimator!. https://roughestimator.com/mortar-calculator
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