Self-Leveling Concrete Calculator: Bags, Water & Dry Time
Bags of self-leveling underlayment for your floor from its area and average depth, with the mixing water, by brand.
By Marko VisicBSc Physics, University of Ljubljana
8bags
LevelQuik RS, 50 lb bags, at an average depth of 1/4 in
42 to 46 quarts of mixing water
- Area
- 180 sq ft
- Average depth
- 1/4 in
- Bags
- 8
- Poured
- 3.75 cu ft
- Water
- 42 to 46 quarts
- Sq ft per bag here
- 23.0
LevelQuik RS covers 46 to 48 sq ft a bag at an eighth of an inch; the count uses the low end and scales it with depth. Add extra for low spots you can’t see and for waste.
8 bags of LevelQuik RS at an average 1/4 in, 42 to 46 quarts of water
Self-leveling concrete is sold by the bag, and a bag covers less the deeper you pour. A 15 by 12 ft floor at an average 1/4 inch takes 8 bags of LevelQuik RS, with 42 to 46 quarts of mixing water; SikaLevel, which covers 42 sq ft a bag at an eighth of an inch, takes 9.
The depth that counts is the average one: the pour fills the low spots and finishes level, so a floor with a dip takes more than its high spots suggest.
How much self-leveling concrete do I need
Each maker prints what a bag covers at a few depths, and the figures scale with depth: a bag covers an eighth as much at a full inch as at an eighth of an inch. So the work is one multiplication and one division.
Bags = area (sq ft) × average depth (in) ÷ sq ft one bag covers at 1 in, rounded up
Water = bags × water per bag
Example: a 15 by 12 ft floor is 180 sq ft. At an average 1/4 inch that is 45 square-foot-inches. LevelQuik RS covers 5.75 sq ft a bag at an inch, so 7.8 bags, rounded up to 8; SikaLevel, at 5.3, takes 9; ARDEX K 22 F, at 50 sq ft a bag at an eighth of an inch, takes 8.
Self-leveling coverage per bag
Coverage per bag at the depths each maker prints, with ARDEX’s worked out from its eighth-inch figure. The calculator uses the low end of LevelQuik’s ranges, and Sika notes its figures carry no allowance for surface profile, porosity or waste.
| Average depth | LevelQuik RS | SikaLevel | ARDEX K 22 F |
|---|---|---|---|
| 1/8 in | 46 to 48 sq ft | 42 sq ft | 50 sq ft |
| 1/4 in | 23 to 24 sq ft | 21 sq ft | 25 sq ft |
| 1/2 in | 11.5 to 12 sq ft | 11 sq ft | 12.5 sq ft |
| 1 in | 5.75 to 6 sq ft | 5.3 sq ft | 6.3 sq ft |
How thick to pour
Measure the floor’s highs and lows with a long straightedge or a laser, and settle the finished height: the average depth is the average gap between that height and the floor. Each product has its own range in a single pour without added aggregate: LevelQuik RS from featheredge to 1.5 in, SikaLevel from 1/8 in up to 2 in, and ARDEX K 22 F from 1/8 in to 1¼ in, or 2 in with aggregate. The calculator warns when the average runs past the maker’s figure.
How long self-leveling concrete takes to dry
Self-leveler is walkable within hours, but the floor going on top sets the wait. The times below are the makers’; Custom gives its at 70 °F and 50% RH, and Sika notes that low temperatures extend drying.
| Product | Walk on | Tile | Vinyl, carpet, rubber | Wood |
|---|---|---|---|---|
| LevelQuik RS | 2 to 4 hours | after 4 hours | after 16 hours | after 16 hours |
| SikaLevel | 2 to 3 hours | 2 to 3 hours | 1 day | 3 days |
| ARDEX K 22 F | not in the brochure | as little as 24 hours | as little as 24 hours | as little as 24 hours |
Concrete itself cures on a different clock; the concrete cure time guide covers slabs and footings.
Mixing water
Measure the water. Custom calls for 5.25 to 5.75 quarts per 50 lb bag of LevelQuik RS and Sika for 1 gallon per 50 lb bag of SikaLevel, so the example floor takes 42 to 46 quarts with LevelQuik or 36 quarts with SikaLevel. The calculator adds it up for the bags it counts.
Self-leveling crack sealer and joint sealant
A self-leveling sealant is a different product: a runny polyurethane poured into cracks and joints in flat concrete, where it levels across the gap instead of sagging. Sika’s says it is not for sloped surfaces, becomes tack-free in 1 to 2 hours and takes 3 to 5 days to cure. Its yield depends on the joint’s width and depth.
| Joint, width × depth | Feet per 10.1 oz cartridge | Cartridges per hundred feet |
|---|---|---|
| 1/4 × 1/4 in | 24.3 ft | 5 |
| 3/8 × 1/4 in | 16.2 ft | 7 |
| 3/8 × 3/8 in | 10.8 ft | 10 |
| 1/2 × 1/4 in | 12.1 ft | 9 |
| 1/2 × 3/8 in | 8.1 ft | 13 |
| 1/2 × 1/2 in | 6.1 ft | 17 |
| 3/4 × 3/8 in | 5.4 ft | 19 |
| 3/4 × 1/2 in | 4.0 ft | 25 |
| 1 × 1/2 in | 3.0 ft | 34 |
Which cracks to seal, and how, is in the concrete driveway repair guide; joints cut on purpose are covered in the control joint guide.
Self-leveling concrete calculator FAQ
How many bags of self-leveling concrete do I need?
Multiply the floor area by the average depth in inches and divide by what one bag covers at an inch. A 15 by 12 ft floor at an average 1/4 inch takes 8 bags of LevelQuik RS, which covers 5.75 to 6 sq ft a bag at an inch.
How long does self-leveling concrete take to dry?
Hours to walk on, longer to cover. Custom rates LevelQuik RS walkable in 2 to 4 hours and ready for tile after 4 hours at 70 °F; Sika puts vinyl and carpet on SikaLevel after 1 day and hardwood after 3 days. Cold slows it down.
How thick can self-leveling concrete be poured?
It depends on the product: LevelQuik RS goes from featheredge to 1.5 in in one pour, SikaLevel from 1/8 in up to 2 in, and ARDEX K 22 F up to 1¼ in neat or 2 in with aggregate.
How much does a bag of self-leveler cover?
At an eighth of an inch, LevelQuik RS covers 46 to 48 sq ft a bag, SikaLevel 42 sq ft and ARDEX K 22 F 50 sq ft. Double the depth and a bag covers half as much.
How much water goes in a bag of self-leveler?
What the bag says, measured: 5.25 to 5.75 quarts for a 50 lb bag of LevelQuik RS and 1 gallon for a 50 lb bag of SikaLevel.
What is self-leveling crack sealer?
A pourable sealant for cracks and joints in flat concrete, not a floor leveler. A 10.1 oz cartridge of Sikaflex Self Leveling Sealant fills about 24.3 ft of a quarter-inch square joint, and Sika says it is not for sloped surfaces.
Sources & method
Bags are the area times the average depth, divided by the square feet one bag covers at an inch and rounded up: the low end of LevelQuik RS’s chart, SikaLevel’s printed figure, and ARDEX K 22 F’s eighth-inch coverage scaled to an inch. Coverage, depth limits, drying times and water are from Custom Building Products’ data sheet TDS-108, Sika’s SikaLevel data sheet and ARDEX’s K 22 F brochure; sealant yield from Sika’s Sikaflex Self Leveling Sealant data sheet.
- Custom Building Products. LevelQuik RS (Rapid Setting) Self-Leveling Underlayment, TDS-108. Jul 17, 2026
- Sika Corporation. SikaLevel Self Leveling Underlayment, Product Data Sheet (Version 01.06). May 2026
- ARDEX Americas. ARDEX K 22 F High Flow, Fiber Reinforced Self-Leveling Underlayment, Summary Brochure. retrieved Nov 15, 2026
- Sika Canada. Sikaflex Self Leveling Sealant, Product Data Sheet (Version 01.02). April 2026
- Concrete Bag Calculator: How Many Bags Do I Need?Bags of concrete mix for a slab, footing or post hole.
- Concrete Driveway Repair: Cracks, Spalling & PatchingWhich cracks to seal and how, before you pour or patch.
- Control Joints in Concrete: Spacing, Depth & TimingWhere the joints a self-leveling sealant fills come from.