How to use it
- Enter length in feet
- Enter width in feet
- Enter thickness in inches
- Read cubic yards, bags, and cubic feet
This calculator determines the exact volume of self-leveling concrete required for your slab or floor repair. Enter the length and width in feet, plus the thickness in inches, and it returns cubic yards, total 80-lb bags needed, and cubic feet. Why it matters: ordering too little means costly delays; too much wastes money. Each 80-lb bag yields 0.6 cubic feet, so the bag count divides total cubic feet by 0.6 and rounds up. The cubic yard figure helps you compare supplier quotes. Read the results as minimums—add 5-10% waste if the subfloor is uneven or you expect spillage. Use the cubic feet value to verify bag calculations manually. This tool is instant and free, giving you confidence before you place a single order.
Pro tips
- Add 5-10% waste for uneven subfloors
- Round bag count up to whole bags
- Order 10% extra for spillage and errors
- Never confuse thickness in inches with feet
Real-life examples
- Garage floor leveling before epoxy coating
- Underfloor heating conduit embedding
- Balcony repair to restore flatness
Case study
Mike needed to level a 10×10 floor at 2-inch thickness. He calculated 16.67 cubic feet, ordered 28 bags, and had 0.2 bags left over. Without the calculator, he would have guessed 20 bags and ran short mid-job, delaying the epoxy install by a week.