Screed Calculator
Your estimate
Bags75
Cement bags14
- Volume
- 1.22 yd³33 ft³ · 0.93 m³
- Weight
- 2.06 tons4,120 lb · 1.87 t
- Sand weight
- 1.71 tons3,428 lb · 1.55 t
Floor screed by volume and weight — as pre-mixed bags or your own sand and cement.
Updated 2026-10-20 · Based on: coverage figures from paint and drywall makers (USG).
How to use the Screed Calculator
- Enter the floor size and screed thickness (50 mm bonded or 65–75 mm floating is typical).
- Pick the mix ratio for site mixing (1:4 is standard).
- Read the bags, or cement and sand.
Formula
Screed volume = length × width × thickness; laid screed weighs about 2,000 kg/m³.
Site mix: dry volume = 1.3 × wet volume, split by the cement : sand ratio.
Worked example
With the values preset in the calculator above:
- Length
- 15 ft
- Width
- 12 ft
- Thickness
- 2 in
- Mix (cement : sand)
- 1 : 4
- Extra for waste
- 10 %
- Bags
- 75
- Volume
- 1.22 yd³ (33 ft³)
- Weight
- 2.06 tons (4,120 lb)
- Cement bags
- 14
- Sand weight
- 1.71 tons (3,428 lb)
Frequently asked questions
How much screed for 20 m² at 50 mm?
1.1 m³ — about 88 bags of 25 kg pre-mix including 10 % extra.
What is the best screed mix?
1 part cement to 4 parts sharp sand (1:4) for most floors; 1:3 for thin or heavy-duty screeds.
How long does screed take to dry?
Roughly 1 day per mm for the first 40 mm, then slower — a 50 mm screed needs about 6–8 weeks before moisture-sensitive flooring.
More calculators
Estimates only — check quantities with your supplier and local building code before you order.