Self-Leveling Concrete Calculator
Calculate materials, costs, and timeline for your floor leveling project with professional accuracy.
Project Area
Pour Thickness
- 1/8": Minor smoothing
- 1/4": Standard tile prep
- 1/2"+: Major leveling
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Standard SLC
High-Flow Premium
Rapid Set
Custom Specs
Custom Product Details
Adds 1 gallon of primer per 350 sq ft (~$30/gal).
Total Estimate
Standard SLC
Cost Breakdown
What is Self-Leveling Concrete?
Self-leveling concrete (SLC) is a polymer-modified cement that flows easily and creates a smooth, flat surface for flooring installation. Unlike traditional concrete, it doesn't require extensive troweling—simply pour and it levels itself using gravity. It's ideal for preparing uneven subfloors before installing tile, hardwood, laminate, vinyl, or carpet.
Frequently Asked Questions About Self-Leveling Concrete
Do I need primer for self-leveling concrete?
Yes! Primer seals the subfloor preventing the concrete from losing moisture too quickly (which causes cracking) and prevents air bubbles. Always apply primer before pouring self-leveling concrete for best results.
How much water do I add to self-leveling concrete?
Precision is key. Most 50lb bags require exactly 5-5.25 quarts of water. Too much water weakens the concrete; too little makes it not flow properly. Always follow the manufacturer's instructions.
Can I pour self-leveling concrete over tile?
Generally yes, if the tile is secure and well-bonded to the subfloor. You must use a special "non-porous" primer designed for tile surfaces to ensure a strong chemical bond.
What is the minimum thickness for self-leveling concrete?
Most self-levelers need at least 1/8" (3mm) thickness to flow properly and maintain structural integrity without cracking. Some products can go thinner at feathered edges.
How many bags of self-leveling concrete do I need per square foot?
At 1/4" thickness, most 50lb bags cover approximately 40-50 square feet. Coverage decreases as thickness increases — at 1/2" you'll get about 20-25 sq ft per bag.
How thick can you pour self-leveling concrete?
Most standard self-leveling compounds can be poured up to 1" (25mm) thick in a single application. For deeper pours, apply in multiple layers or use a deep-pour product.
How long does self-leveling concrete take to dry?
Self-leveling concrete typically becomes walkable in 2-6 hours. Standard SLC takes about 4 hours, while rapid-set formulas can be walked on in 1-2 hours. Full cure takes 24-48 hours.
Can you put flooring directly on self-leveling concrete?
Yes, once fully cured (typically 24-48 hours), you can install most flooring types directly including tile, hardwood, laminate, vinyl, and carpet. Some may require moisture testing first.
What is the coverage of a 50 lb bag of self-leveling concrete?
A 50 lb bag typically covers 40-50 square feet at 1/4" thickness. Coverage varies by brand — high-flow premium products may cover slightly less area than economy products.
Do I need to seal self-leveling concrete?
If you're installing flooring over the self-leveling concrete, sealing is usually not necessary. However, if it will be the finished surface or you're installing moisture-sensitive flooring, a sealer may be recommended.