Concrete Block & Masonry Calculators
Every tool on this page answers one masonry question: how many blocks, how much grout, how many mortar bags, or what a retaining wall needs. Each calculator is free, works in imperial and metric, and adds a waste allowance so you never run short.
Choose Your Block Calculator
Concrete Block Calculator
The main estimator. Count CMU blocks for one or more walls, deduct doors and windows, and get mortar bags and material cost.
Retaining Wall Block Calculator
Estimate landscape wall blocks, cap blocks, base gravel, drainage backfill, waste allowance, and optional material cost.
Block Fill Calculator
Estimate CMU core fill and grout volume in cubic yards, plus 80-lb pre-mix bags, fill spacing, and waste allowance.
Block Mortar Calculator
Estimate mortar bags per 100 block, 80-lb or 60-lb bags, and a portland, lime, and sand mix by mortar type N, S, M, or O.
Which Calculator Do I Need?
| Your job | Use this tool | It estimates |
|---|---|---|
| Build a CMU or cinder block wall | Concrete Block Calculator | Block count, mortar bags, material cost |
| Build a garden or landscape retaining wall | Retaining Wall Block Calculator | Wall blocks, cap blocks, gravel, backfill |
| Fill block cores with grout or concrete | Block Fill Calculator | Grout volume, 80-lb pre-mix bags |
| Mix or buy mortar for laying block | Block Mortar Calculator | Mortar bags, portland, lime, sand mix |
Start With the Main Block Estimator
Not sure where to begin? Most projects start with a simple block count. The main estimator handles multiple walls, subtracts openings, and shows mortar and cost in one pass. You can jump to a specialty tool any time.
Open the block calculator