Floor Leveling Compound Calculator
Estimate bags of floor leveling compound from the area and average fill depth, using each bag’s cubic-foot yield.
How it works
volume (cu ft) = area × (depth ÷ 12) · bags = ceil(volume ÷ bag yield)
Leveling compound is estimated by volume: the floor area times the average fill depth in feet. Because depth is entered in inches it is divided by 12. Dividing the resulting cubic feet by a bag’s yield — about 0.5 cubic feet for a typical 50 lb bag — gives the bag count. Use the average depth over the whole area, not the deepest low spot, or you will badly over-buy.
Worked example
Skim-filling a 200 sq ft floor to an average 1/4 inch: 200 × (0.25 ÷ 12) = 4.17 cubic feet. At 0.5 cu ft per bag that is 9 bags, or 10 with a waste allowance — each bag covering about 24 sq ft at that depth.
Frequently asked questions
How do I find the average depth?
Set a laser or string line to your finished plane and measure the gap at a grid of points across the floor, then average them. A floor that is flat except for one dip has a small average depth even if the dip is deep, which is what governs total material.
Is this the same as self-leveling underlayment?
Related but not identical. Patching or feather-finish leveling compounds are troweled and feather to nothing; self-leveling underlayment is poured to a minimum thickness and flows out on its own. Use the underlayment calculator when you are pouring a full pour to a minimum depth.
Do I need primer?
Almost always. Most compounds require a bonding primer so they adhere and do not flash-dry against a porous slab. Primer does not change the bag count but is essential to keep the fill from delaminating.
Related calculators
Estimates only — add for waste and confirm against local building codes and supplier specs.