Floor leveling calculator

Figure the dry mix for leveling a floor: self-leveling underlayment or a sand-cement bed.

±0t
Letters on the drawing match the letters next to the inputs.
ft
ft
in
lb
More settings
%
Dry mix262 lb

Shopping list

  • Bags6 bags of 50 lb

How we got there

Floor area
120 sq ft
Volume
2.5 ft³
Consumption used
8.3 lb/sq ft per in

Results are estimates. Always check the coverage printed on the product and your local building code.

How it is calculated

The amount depends on the floor area, the average depth and how many pounds per square foot each inch takes. The calculator uses about 8.3 lb per sq ft per inch for self-leveler and 10.4 for a sand-cement bed. Measure the depth in several spots with a laser or long level and use the average.

FormulaMix, lb = area × depth × consumption × (1 + extra)Bags = mix ÷ bag weight, rounded up

Example

A 12 × 10 ft floor leveled 1/4 in deep with self-leveler takes about 262 lb with 5 % extra — 6 bags of 50 lb.

Tips from practice

  • Always prime the subfloor first or the mix loses water and cracks.
  • Most self-levelers are rated from 1/8 to 1 1/2 in. Thicker pours need a mortar bed.
  • Pour the whole room at once: stage all bags and helpers ahead of time.

Questions and answers

How far does a 50 lb bag go?

About 24 sq ft at 1/4 in, or 12 sq ft at 1/2 in.

What is the minimum depth?

Usually 1/8 in for self-leveler and about 3/4 in for a sand-cement bed.

When can I install flooring?

From 24 hours for rapid-setting products to several days for thick pours; follow the bag.

Found a mistake in a formula? Write to [email protected]