Self-leveling concrete calculator: how many bags of self-leveling concrete do I need?
6 bags
2.5 cu ft · 120 sq ft at 1/4 in · a 50 lb bag yields 0.45 cu ft · for a 12 × 10 ft floor at 1/4 in
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Enter it the way you measured it: 4.5, 4 1/2,
3/8 or 10' 6".
6 bags
2.5 cu ft · 120 sq ft at 1/4 in · a 50 lb bag yields 0.45 cu ft
Source: QUIKRETE Self-Leveling Floor Resurfacer No. 1249-50 data sheet, bag yield and maximum layer thickness, read October 15, 2026. Data sheet (PDF)
A 10 by 12 ft floor poured 1/4 inch thick takes 2.5 cubic feet of self-leveling resurfacer, which is 6 bags of 50 lb, because each bag yields 0.45 cubic feet, about 21 square feet at 1/4 inch.
A worked example
A 13 ft 6 in by 9 ft floor at an average of 3/8 inch needs 9 bags. 121.5 square feet × 3/8 in is 3.80 cubic feet. At 0.45 cubic feet a bag that is 8.4 bags, rounded up to 9; at 3/8 in it is one layer, under the 5/8 in limit.
How thick can self-leveling concrete be poured?
Quikrete's data sheet for its Self-Leveling Floor Resurfacer gives a range from a feather edge up to 5/8 inch in one pour. Deeper spots go in more than one layer of 5/8 inch or less, with the floor primed between layers using its bonding adhesive. The calculator counts the bags for the total thickness and marks when it takes more than one layer.
How much area does a bag of self-leveling concrete cover?
A 50 lb bag of the 1249 resurfacer covers about 21 square feet at 1/4 inch. Coverage falls as the pour gets thicker: about 14.4 square feet at 3/8 inch, 10.8 at 1/2 inch and 8.6 at 5/8 inch, all from the same 0.45 cubic feet. The table below gives the bag count for common floor sizes at each thickness.
What else it is called
Self-leveling concrete is also sold as self-leveling underlayment, floor leveler or self-leveling compound. It is poured to flatten a floor before tile, vinyl or carpet, not to make a slab: for a slab, the concrete slab calculator uses regular concrete mix.
Common sizes
| Area | 1/8 in | 1/4 in | 3/8 in | 1/2 in | 5/8 in |
|---|---|---|---|---|---|
| 8 × 8 ft | 2 | 3 | 5 | 6 | 8 |
| 10 × 10 ft | 3 | 5 | 7 | 10 | 12 |
| 10 × 12 ft | 3 | 6 | 9 | 12 | 14 |
| 12 × 12 ft | 4 | 7 | 10 | 14 | 17 |
| 12 × 16 ft | 5 | 9 | 14 | 18 | 23 |
| 16 × 20 ft | 8 | 15 | 23 | 30 | 38 |
| 20 × 20 ft | 10 | 19 | 28 | 38 | 47 |
50 lb bags of QUIKRETE Self-Leveling Floor Resurfacer at 0.45 cu ft each, rounded up. 5/8 in is the thickest single layer the data sheet allows.
Where the numbers come from
- Bag yield and layers: QUIKRETE Self-Leveling Floor Resurfacer, product No. 1249-50, data sheet. A 50 lb bag provides 0.45 cu ft of material at a pourable consistency and covers 21 sq ft at 1/4 in; it is installed from 5/8 in thick to a feather edge, and areas deeper than 5/8 in go down in layers of no more than 5/8 in each, primed between layers with QUIKRETE Concrete Bonding Adhesive. Read October 15, 2026. Data sheet (PDF)
- Volume is geometry: floor area × thickness in feet. Bags are the volume divided by 0.45 cu ft, rounded up. The 21 sq ft on the sheet is 0.45 cu ft at 1/4 in, 21.6 rounded down, so the count from the volume and the count from 21 sq ft agree.
Bag counts are rounded up and cover the yield of this one product. Other self-leveling underlayments, including other Quikrete lines, print a different yield per bag; enter the floor and thickness, then divide the cubic feet by the yield on your bag. Thickness is the average over the floor: measure the low spots against a straightedge and average them with the high ones.
By Javier Miralles · Last updated . How this site is made.
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