Calculated result
4bags
Bags to mix
Formula
FLOOR-SLU-001bags = ceil(L × W × depth × (1 + waste) ÷ bag yield)
1.25 ft³
Pour volume
1.375 ft³
Volume including waste
120 ft²
Floor area
Flooring calculator
Self-leveling calculator
a 12 × 10 ft floor at ⅛ in, 0.40 ft³ bag yield and 10% waste rounds to 4 bags. In metric, pour volume is 0.04 m³.
Formula. bags = ceil(L × W × depth × (1 + waste) ÷ bag yield)
Self-leveling bags from floor area, pour depth and the bag yield printed on the sack.
By Feroz Sheikh · Formula FLOOR-SLU-001 v1.0.0 · Tested formula
Formula
FLOOR-SLU-001v1.0.0Project inputs
Enter your measurements. Switching units converts the same project, including coverage and unit rates. Package yields keep the unit printed beside each field.
Refine measurements and rates at any time. Your current values are included in the material-list PDF.
Planning estimate, not engineering advice. Confirm site measurements and product specifications. Calculation limits.
Floor area times pour depth, divided by the bag yield printed on the sack, after waste, rounded up to whole bags.
- Measure the floor that will receive the pour, not the room including cabinets you will float around.
- Depth is the average. Low spots eat extra — that is the waste field.
- Thinset and grout stay tile companions.
Add your project costs
Enter supplier prices and any labour, equipment or delivery costs. Pick a currency — badges, inputs, and totals follow.
Costs use the carton or square-foot rate you type. Construclytic does not fetch store prices. Underlayment, grout, thinset and labour stay companion lines.
How this calculator works
A transparent self-leveling underlayment takeoff.
Feroz SheikhWritten and reviewed by Feroz Sheikh · founder
Floor area times pour depth, divided by the bag yield printed on the sack, after waste, rounded up to whole bags.
FLOOR-SLU-001 is a volume pour: area × depth ÷ the bag yield printed on the self-level sack, after waste. Thinset is a trowel-coverage bag on a different page. Mortar yield is the wrong sack.
Site-mixed screed is not this sack
Cement kilograms and sand cubic metres for a sand-cement screed at 50 mm and 75 mm are in sand-cement floor screed per square metre. This calculator divides area by the yield printed on a premixed self-level bag. The two products do not share a bag count.
Printed coverage by depth
This self level calculator divides floor area by the yield printed on the sack. LevelQuik RS covers 46–48 sq ft per 50 lb bag at 1/8 in and 23–24 sq ft at 1/4 in. Bag counts for 50 to 500 sq ft, and a 25 kg table, are in self-leveler bags per square foot. The 0.40 ft³ field below is a planning start. Replace it with the yield on your sack.
Worked example. Example: a 12 × 10 ft floor at ⅛ in, 0.40 ft³ bag yield and 10% waste rounds to 4 bags.
See the example inputs and calculated result
This separate example uses the calculator's starting values in imperial units. It stays unchanged when you edit the tool above. Example rates, yields and dimensions are assumptions, not recommendations for your project.
| Input | Example value |
|---|---|
| Floor length | 12 ft |
| Floor width | 10 ft |
| Pour depth | 0.125 in |
| Bag yield | 0.4 ft³ / bag |
| Waste factor | 10 % |
Example result: Bags to mix — 4 bags.
bags = ceil(L × W × depth × (1 + waste) ÷ bag yield)
Use the labelled units above when reproducing this example. To work in metric, switch the calculator to Metric; applicable measurements are converted, while product-specific units remain labelled.
- 1. Measure the floor that will receive the pour, not the room including cabinets you will float around.
- 2. Depth is the average. Low spots eat extra — that is the waste field.
- 3. Thinset and grout stay tile companions.
Field notes that change the number
- Measure the floor that will receive the pour, not the room including cabinets you will float around.
- Depth is the average. Low spots eat extra — that is the waste field.
- Use the yield on the self-level sack. A 50 lb planning figure of 0.40 ft³ is a start, not a brand.
Common mistakes
- Using the thinset calculator for a pour.
- Using a mortar bag yield.
- Ordering from net volume and skipping the spare bag.
Need the broader workflow? Read the flooring planning guide.
Questions
Questions about self-leveling underlayment
How does a self level calculator count bags?
Bags = ceil(area × depth ÷ bag yield), after one waste allowance. A 10 × 10 ft floor at 1/8 in and 0.50 ft³ per bag with no waste returns 3 bags. Replace 0.50 ft³ with the yield on the sack. The 0.40 ft³ opening value is a planning start, not a brand.
Is a self level calculator the same as thinset?
No. Thinset is a trowel-coverage bag. This page is a volume pour from area, depth and the yield printed on the self-level sack.
Is this thinset?
No. Thinset is a trowel-coverage bag. Self-level is a volume pour.
Can I use a mortar bag yield?
Use the yield on the self-level sack. Mortar and SLU are different products.
What is the formula ID?
This self-leveling calculator publishes formula FLOOR-SLU-001, version 1.0.0. The ID stays on the result and on the estimate line.