Overview
Use this screed calculator to size cement screed, anhydrite screed, and self-leveling screed for real job conditions. It turns floor area and layer thickness into volume, then estimates the total mix weight and how many bags to order. The result is useful when you need to coordinate delivery, mixing time, and installation height. If you already know the product’s consumption rate or density, enter that value directly; if not, use the material specification from the manufacturer and add a sensible waste allowance for trimming, spillage, and subfloor unevenness.
Use cases
- Apartment renovationWork out how much screed is needed for a living room, hallway, and bedroom before placing a material order.
- Underfloor heating layerPlan the screed quantity above heating pipes where thickness control and delivery volume matter.
- Bag-based purchase planningCheck whether a 20 kg or 25 kg pack size gives a cleaner order quantity for the job.
- Product comparison on siteCompare cement, anhydrite, and self-leveling products using their own consumption values.
How it works
- 1
Enter the floor area in square meters.
- 2
Set the screed thickness in millimeters.
- 3
Enter the product consumption or density.
- 4
Add a waste percentage for practical overage.
- 5
Enter the bag weight to estimate the number of bags.
Examples
Living room slab
Input: Area: 18 m2, thickness: 45 mm, consumption: 1.95 kg/m2/mm, waste: 6%, bag weight: 25 kg
Output: Volume: 0.81 m3, total mix: 1,577 kg, bags: 64
Suitable for a standard room with a moderate screed layer.
Kitchen with underfloor heating
Input: Area: 12.5 m2, thickness: 55 mm, consumption: 2.10 kg/m2/mm, waste: 8%, bag weight: 20 kg
Output: Volume: 0.69 m3, total mix: 1,432 kg, bags: 72
Useful where pipe cover and a larger waste margin are expected.
Large utility area
Input: Area: 38 m2, thickness: 40 mm, consumption: 1.75 kg/m2/mm, waste: 5%, bag weight: 25 kg
Output: Volume: 1.52 m3, total mix: 2,762 kg, bags: 111
A realistic order estimate for a broader floor section.
FAQ
What should I enter if the product uses density instead of consumption?
Use the density value from the technical sheet and the calculator will convert the area and thickness into total mass. Do not mix density and consumption at the same time unless the product instructions tell you to.
Why do I get different results for the same room with different screed types?
Each product can have a different consumption rate and packing weight. The room volume stays the same, but the mass and bag count change with the material specification.
Does bag count round up automatically?
Yes. The calculator should be treated as an ordering estimate, so any partial bag is rounded up to a full bag.
How do I choose a sensible waste percentage?
Use a higher allowance when the base is uneven, the room has many edges, or the mix will be pumped over a longer distance. Use a smaller allowance for simple rectangular rooms with a well-prepared substrate.
Can I trust the calculated volume if the floor is not perfectly level?
The result assumes a uniform thickness across the whole area. If the floor varies a lot, measure the average thickness or calculate separate zones and add them together.