Mortar Calculator
Mortar dry volume is the wet volume multiplied by 1.33, then split by the mix ratio. 50 cu ft of wet mortar at 1:4 with 10% wastage needs about 15 cement bags and 58.5 cu ft of sand.
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Formula
- Dry volume = Wet volume x 1.33 x (1 + wastage%)
- Cement volume = Dry volume x 1/(1+n)
- Cement bags = Cement volume x 94 lb per cu ft, divided by bag weight
- Sand = Dry volume x n/(1+n)
Worked Example
| Input | Value |
|---|---|
| Wet volume | 50 cu ft |
| Mix | 1:4 |
| Wastage | 10% |
| Dry volume | 73.15 cu ft |
| Cement | 15 bags of 94 lb |
| Sand | 58.52 cu ft |
Frequently Asked Questions
What is the dry factor for mortar?
1.33. Mortar shrinks less than concrete because it has no coarse aggregate.
Which mortar ratio should I use?
1:4 is standard for load-bearing brickwork, 1:6 is economical for partition walls and 1:3 is used where high strength is needed.
How much mortar does 1,000 bricks need?
About 8 cubic feet of wet mortar for standard brickwork with a 10 mm joint.
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Estimates only. Quantities follow recognised standards (ACI 318, CRSI, IRC 2021, IS-1077, PBQS); actual site consumption varies with workmanship, wastage and detailing. Confirm with a licensed engineer before ordering.