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Screed calculator

Enter the floor area and the screed thickness: calculates the volume to prepare with a margin, and the cement (in bags), sand and water for the mix you set.

Dimensions

m²
cm

Bonded screed: 3–5 cm; floating screed: 5–7 cm.

%

Waste and cuts (pertes, chutes) • Extra material added for breakage, cuts and offcuts. It is a percentage you set: the usual figure depends on the material and the job.

kg/m³
kg

Bag (sac) • A bag of cement or mortar as the supplier sells it. Its weight (often 25 or 50 kg) is the one on the bag: type the one you buy.

kg/m³
L/m³

Enter the dimensions to see the drawing.

Calculation results

Fill in the fields to see the result.

Preliminary estimate from the values entered: not a structural validation and not an execution plan. Check the local rules and the manufacturers’ data.

Your last inputs are kept in this browser.

Results are provided for information. Check tax rates and legal requirements that apply to you.

How to use it

  1. Enter the floor area in m².
  2. Enter the screed thickness in centimetres.
  3. Adjust the cement dosage, sand and water to your mix.
  4. Read the cement bags, sand and water to plan.

Examples

20 m² at 5 cm

5 % margin: 1.050 m³ of screed, 368 kg of cement (8 bags of 50 kg), 1,470 kg of sand and 210 L of water.

Frequently asked questions

What thickness for a screed?

About 3 to 5 cm for a bonded screed and 5 to 7 cm for a floating screed on insulation. Follow the requirements of your floor covering.

What cement dosage?

Traditional cement screeds are often mixed at 300 to 350 kg of cement per m³. Ready-mixed products have their own data sheets.

Does the calculator handle levelling compounds?

For self-levelling compounds sold in bags, use the manufacturer’s consumption per m² and mm instead.

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