Self-Levelling Compound Calculator
It is easy to calculate exactly how much self-levelling compound you will need. Bear in mind you should always have a bag or two extra just in case you end up using more than expected.
The self-Levelling compound comes typically in either a 20kg or 25kg bag. This is standard across all manufacturers.
Self-levelling compound that is mixed with a tub of latex normally comes in a 20kg bag and covers 3m² on average, poured at a thickness of 5mm.
Self-levelling compound that is mixed with water comes typically in a slightly larger 25kg bag. The coverage can vary depending on how much water you add, but it is usually around the same at 3m² @ 5mm thick.
Important Note
I have included a list of the most common self-levelling compounds coverage. You should always check with the manufacturer’s data sheet for your chosen self-levelling compound.
Self Levelling compounds mixed with Latex
- Ultra ProLevel Flexible Two Part leveller – 20kg bag – 2.4m² @ 5mm thick
- DATA SHEET – Ultra ProLevel Flexible Two Part Floor Leveller
- Mapei Latexplan No Ammonia – 20kg bag – 3m² @ 5mm thick
- DATA SHEET – Mapei Latexplan No Ammonia
- Arditex NA – 20kg bag – 3m² @ 5mm thick
- DATA SHEET – Arditex NA
Self Levelling compounds mixed with Water
- Sikafloor 125 Level Latex – Unknown
- DATA SHEET – Sikafloor 125 Level Latex
- BAL Level Max – 25kg – 3m² @ 5mm coverage
- DATA SHEET – BAL Level Max
- Mapei Ultraplan Renovation Screed 3240 – 25kg bag – 3.5m² @ 5mm
- DATA SHEET – Mapei Ultraplan Renovation Screed 3240
- Setcrete Latex floor levelling compound – 20kg bag- 2.3m² @ 5mm
- DATA SHEET – Setcrete Latex floor levelling compound

I have assumed that you will be pouring your self-levelling compound at a thickness of 5mm. Self-levelling compound is not designed to completely level the floor, it is designed to smooth out the floor.
It is usually only applied in a thin 5mm layer, if you are applying your self-levelling compound thicker you may have to recalculate the coverage accordingly.
Firstly you will need to calculate the floor area of your room. Measure the length of your room and measure the width of your room, and multiply them together.
Length (m) x Width (m) = Area (m²)
If you take your measurements in meters (m) it will make it easier, as the manufacturers normally give the coverage in meters squared (m²)
Self-Levelling Compound Calculation
Arditex NA self-levelling compound comes in a standard 20kg bag and will cover 3m² at a thickness of 5mm. All you need to do is calculate the Area of your room and the thickness required.
Area of Room (m²) = Length (m) x Width (m)
Bags required = Area of Room 24m (m²) / coverage 3m² @ (5mm thick)
4m x4m =24m² 24m²/3m² = 8 bags (2 bags spare)
For a room 4m x 4m you will need exactly 8 bags, I would get 10 bags just in case you pour the self-levelling compound thicker than expected. There is nothing worse than running out mid-pour and having a ridge in your floor.
If you need to increase the thickness of the self-levelling the coverage decreases in direct proportion. Using this example, If you are pouring your self-levelling compound at 10mm thick, you will require double the amount of bags.
Just Remember: You are only working to the number of bags at the end of the day. You will never quite know how many you will use until you start pouring it. It’s sort of the best guess scenario. Don’t be exact to one bag, get a couple of extra bags and hope for the best! Especially if it is your first time self-levelling.