Floors & Walls
Self-Leveling Concrete Calculator
Estimate self-leveling compound bags from area, average depth and product yield.
Enter your measurements
Results update as you type.
About this calculator
Enter the floor area, the average depth you need to pour, and the product's wet yield per bag from the data sheet. The required wet volume and whole bag count follow directly. There is no generic yield — every product differs.
How to use this calculator
- Measure the floor area.
- Determine the average depth from several spot measurements.
- Enter the product's stated wet yield per bag.
- Calculate for whole bags; stay within the product's approved depth range.
Formula
Required wet volume = area × average depth × (1 + allowance ÷ 100)
Bags = ⌈required volume ÷ yield per bag⌉
Assumptions
- Yield per bag comes from the product data sheet — there is no generic value.
- Average depth is your responsibility; depth varies across real floors.
- Allowance applies once to the wet volume.
Common mistakes
- Using a coverage or yield for a different product, depth or application.
- Adding waste twice in both the measured quantity and allowance field.
- Treating a bag count as proof that the selected product is suitable for the installation.
Worked example
Try it: press “Load example” above the form.
100 ft² at ¼ in is about 2.083 ft³; with 10% extra, 2.29 ft³, so 5 bags at 0.5 ft³ each.
Limitations
No generic yield and no approved depth range; product limits remain the user's and manufacturer's responsibility. No strength or floor-load design.
Frequently asked questions
Why does average depth matter?
Volume equals area times average fill depth. A single deepest spot can greatly overstate the order, while the thinnest spot can understate it. Measure the floor profile in sections.
Can I use ordinary concrete bag yield?
Use the selected self-leveling product’s yield at its specified mixing conditions. Product limits, minimum depths, primers and installation rules are separate from quantity arithmetic.
What does the worked example show?
100 ft² at ¼ in is about 2.083 ft³; with 10% extra, 2.29 ft³, so 5 bags at 0.5 ft³ each.
Which assumptions should I check before using the result?
No generic yield and no approved depth range; product limits remain the user's and manufacturer's responsibility. No strength or floor-load design.
Sources
Sources explain the methods and any named product presets. Check your product label where coverage, yield or density differs.
Calculation documentation · Updated 2026-11-11 · Version 1.6.4. Estimates are planning aids. Confirm quantities, coverage and prices with your supplier before purchasing. Found an error? Report it.
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