Free calculator

Mortar calculator

Calculate kilograms, complete bags, purchased coverage and estimated cost using the product data sheet.

✓ Real thickness✓ Editable consumption✓ Bags and cost

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Area, thickness and consumption

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CompareReady-mix mortar vs site-mixedOpen comparison →

Indicative diagram of this calculator inputs — Area and layer thickness affect the quantity of material.

How we calculate mortar

We multiply area, thickness and the product consumption figure, add waste, divide by bag weight and round the purchase up.

m² × thickness × consumption × (1 + waste) ÷ kg per bag

Consumption is not universal

Tile adhesive, repair mortar and screed mortar do not use the same amount. Replace the default with the value stated for your product.

Thickness drives material use

Doubling thickness almost doubles the material. On uneven bases, measure several points and use a cautious average.

The product data sheet matters more than a generic consumption figure

Mortar use changes with product type, substrate and application thickness. A repair mortar, tile adhesive and screed product can have very different consumption values even when the bag weight is the same.

Measure average thickness carefully

Material use rises almost in direct proportion to thickness. On uneven surfaces, one measurement can be misleading. Take several readings and use a cautious average that reflects the real substrate.

Do not mix more than the working time allows

The calculator estimates total quantity, not batch size. Follow the manufacturer's water ratio, mixing time, pot life and application temperature. Large quantities may need to be divided into several manageable batches.

For a more detailed method, see how to calculate mortar. If you are deciding how to source the material, compare ready-mix mortar vs site-mixed.

Editorial review: 11 Oct 2026. The technical data sheet for the exact product should always override the default consumption value.