Mortar
Product water / admixture dose
- where
- total dose (litres)
- bags
- specified dose per bag (litres / bag)
Explain this equation
This scales a manufacturer's dose of water or admixture per bag to the number of bags in your batch.
B is the number of bags. d is the specified dose per bag in litres, taken from the product instructions. D is the total amount in litres for the batch.
The dose is set per bag, so the total is just the number of bags times the dose per bag. There are no conversion factors.
Eight bags at 3 litres a bag need 24 litres. Twice as many bags need twice the total.
Watch out: use the dose from the product data, not a guessed ratio. Sand moisture and conditions affect the real water demand.
Scale a manufacturer-specified dose by the number of bags.
Enter your values to see the result.
Good to know
Enter the product’s dose, not a guessed water ratio. Sand moisture and material type matter; this is arithmetic, not a mix recommendation.
Sources
- Manufacturer instructions
Estimates are not design approval or British Standards compliance checks. Structural arch, retaining-wall, wind, foundation, lintel and masonry-capacity design are not performed. Use the project engineer’s specification.