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Self-Leveling Underlayment Coverage Chart: Sq Ft per Bag

How many square feet does a bag of self-leveler cover? Pour depth is what decides it: twice the thickness, half the area. This chart shows every self-leveling underlayment on the site at four common depths, all scaled from the reference thickness each data sheet prints.

Want bags for your own area, not square feet per bag? The self-leveling underlayment calculator does the arithmetic for every product at once.

Sq ft covered by one bag, by pour depth

Sq ft covered by one bag, by pour depth. Square feet per bag (1 m² = 10.7639 sq ft), scaled from the data sheet's reference thickness.
ProductBag1/8 in1/4 in1/2 in1 inRated depth
ARDEX K 15
ARDEX		55 lb (25 kg)– not rated at this setting30157.51/4–1 1/2 in
Custom LevelQuik Advance
Custom		50 lb (22.68 kg)– not rated at this setting22115.51/4–1 1/2 in
Custom LevelQuik RS
Custom		50 lb (22.68 kg)462311.55.81/8–1 1/2 in
HENRY 555 LevelPro
Henry		40 lb (18.1 kg)4321.510.85.41/8–1 1/2 in
LATICRETE NXT Level
LATICRETE		50 lb (22.7 kg)4422115.51/8–3 in
LATICRETE NXT Level Plus
LATICRETE		55 lb (25 kg)48241261/8–2 in
MAPEI Novoplan 2 Plus
MAPEI		50 lb (22.7 kg)48241261/8–2 in
MAPEI Ultraplan Easy
MAPEI		50 lb (22.7 kg)48241261/16–2 in

Dashes mean the data sheet does not allow that depth for the product. Figures other than the reference thickness are scaled linearly, which is how these products behave in practice and how the calculator works; the manufacturer's own table is on each product page.

Pour depth decides the bag count

Self-leveling underlayment is sold by weight but used by volume, and the volume is a slab: area times average depth. Double the depth and you need double the bags, with no other change. That is why this chart is a grid of depths rather than a single coverage number per product — the figure a data sheet prints (usually 50 lb covers 22 to 24 sq ft at 1/4 in) is only true at that one depth.

Measure the average, not the deepest point

A floor is never flat, which is the whole reason for pouring. If the low spot is 1/2 in below the high point and you pour to just cover the high point, the average depth across the floor is closer to 1/4 in. Measure the deepest point and the highest point, and treat the average as roughly half way between them for a floor that slopes evenly. Pouring to the deepest point alone can add 30-50% to the bag count. Deep fills are also where the rated depth range matters: several products in the table stop at 2 in, and LATICRETE NXT Level goes to 3 in. A dash in the table means the product is not rated for that depth at all.

Worked example: 200 sq ft at 1/4 in

200 sq ft plus 10% waste is 220 sq ft to cover. ARDEX K 15 covers 30 sq ft per 55 lb bag at 1/4 in, so 220 ÷ 30 = 7.33, or 8 bags — 440 lb of powder. Custom LevelQuik RS at 23 sq ft per 50 lb bag needs 220 ÷ 23 = 9.57, or 10 bags (500 lb). LATICRETE NXT Level Plus at 24 sq ft per 55 lb bag also lands at 10 bags, but 550 lb because its bag is heavier. HENRY 555 LevelPro is rated at 43 sq ft per 40 lb bag at 1/8 in, which halves to 21.5 sq ft at 1/4 in, so it needs 11 bags — only 440 lb, the lightest of the four. Go to 1/2 in and K 15 needs 15 bags (825 lb) for the same floor.

What the table does not include

Primer, water and mixing time are not part of these numbers, and neither is the extra bag most crews keep for the last corner. Primer is not optional: every product here requires a proprietary primer over concrete and over most substrates, and skipping it is the usual reason a pour fails. Water is listed per bag on each product page; mix to the maximum the data sheet allows for flow and the minimum for strength, and never add water later to revive a mix that has started to set.

For your own area and depth, use the self-leveling underlayment calculator, which computes every product at once from its own data sheet and shows the bag count next to the weight you will be carrying.

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