Screed Calculator

Calculate floor screed volume plus sand and cement quantities for any floor area and thickness.

m
m
mm
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How to Use This Calculator

How to Use

  1. Enter the length and width of the floor.
  2. Enter the screed thickness – 50–75 mm (2–3 in) is typical for a bonded sand and cement screed.
  3. Choose your sand to cement ratio and read off the materials, or use the pre-mixed bag estimate.

Tips

  • A 1:4 cement to sharp sand mix is the standard floor screed.
  • Minimum thickness is usually 40 mm bonded, 50 mm unbonded and 65–75 mm floating over insulation.
  • Use sharp sand, not building sand, for a strong durable screed.

Common Questions

What mix is used for floor screed?

Standard floor screed is a 1:4 mix of cement to sharp sand. Stronger screeds use 1:3. This calculator supports 1:3, 1:4 and 1:5.

How thick should screed be?

Typical thickness is 50–75 mm. The minimum is around 40 mm for bonded screed, 50 mm unbonded, and 65–75 mm floating over insulation.

How much screed do I need?

Multiply length × width × thickness for the volume, then this calculator splits it into cement bags and sand, or gives an equivalent pre-mixed bag count.

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