What this surface preparation estimate measures
Select one captured TEC Level Set 300 depth row. The selector maps that fixed depth to its recorded approximate coverage per 50 lb bag.
Apply only the allowance you enter to the measured area, then divide by the selected fixed coverage. The fractional result is the unrounded bag requirement; complete bags round upward.
The calculator does not estimate an arbitrary thickness, interpolate between rows, determine substrate readiness, or decide whether this product is appropriate for the project.
This calculator uses only fixed TEC Level Set 300 coverage rows from the recorded 2025 data sheet: 50, 25, 12.5, 6.25, and 3.125 square feet per 50 lb bag at the listed depths. Coverage is approximate. Confirm the current product data sheet, package basis, substrate preparation, application conditions, and product applicability before purchase; this calculator makes no suitability judgment and does not interpolate arbitrary depths.
How to use this calculator
- Project area. Enter the measured area receiving the self-leveling underlayment in square feet. Use the area for this underlayment task and avoid adding any allowance already included in the input.
- Coverage depth. Select one of the fixed TEC Level Set 300 depth rows. The options are 0.125, 0.25, 0.5, 1, and 2 inches, each with its recorded approximate coverage for one 50 lb bag. No other depth is supported.
- Waste / allowance. Optionally enter an additional allowance as a percentage. Enter 10 for 10%; empty or 0 adds no allowance. This percentage is separate from the approximate coverage row.
- Project area / Coverage depth. Confirm that the selected depth is the intended fixed row and that the area uses square feet. The calculation uses the row’s coverage and does not interpolate between depths.
- Project area / Coverage depth / Waste / allowance. Review the calculated adjusted area, fractional bag requirement, complete bags, and nominal purchased coverage. Use current product and project guidance for preparation and applicability before treating the quantity as a purchase decision.
Select Calculate to update the result. Reset restores the example inputs and recalculates the example estimate.
Formulas, variables, and units
coverageSqFtPerBag = fixed TEC Level Set 300 coverage row for coverageDepth
- coverageDepth
- Selected fixed depth value: 0.125, 0.25, 0.5, 1, or 2 inches.
- coverageSqFtPerBag
- Approximate square-foot coverage for one 50 lb bag at the selected fixed row.
adjustedAreaSqFt = areaSqFt × (1 + wasteRate / 100)
- areaSqFt
- Measured project area in square feet before this additional allowance.
- wasteRate
- Entered percentage allowance; empty or 0 adds no allowance.
- adjustedAreaSqFt
- Area basis after applying the entered allowance once.
requiredBags = adjustedAreaSqFt / coverageSqFtPerBag; bags = ceil(requiredBags)
- requiredBags
- Unrounded 50 lb bag equivalents under the selected fixed coverage row.
- bags
- Complete 50 lb bags to purchase after rounding upward.
- coverageSqFtPerBag
- The selected fixed approximate coverage value, not an interpolated or user-entered value.
purchasedCoverageSqFt = bags × coverageSqFtPerBag
- bags
- Whole 50 lb bags purchased.
- purchasedCoverageSqFt
- Nominal coverage represented by the purchased complete bags under the selected row.
How to read your result
Adjusted area is the measured area after applying only the explicit allowance you entered.
Coverage per 50 lb bag is the fixed approximate TEC Level Set 300 row associated with the selected depth.
Required bags before rounding preserve the fractional demand from the selected coverage row.
Complete bags are the whole 50 lb bags required after rounding upward. Purchased coverage is the nominal coverage represented by those complete bags.
Displayed values use up to two decimal places. Complete purchase units are rounded upward from the unrounded requirement.
A worked purchase example
- Project area
- 100 sq ft
- Coverage depth
- 0.25 in — approximately 25 sq ft per 50 lb bag
- Waste / allowance
- 10 %
- The selected 0.25 in TEC Level Set 300 row has approximate coverage of 25 ft² per 50 lb bag.
- An elected 10% allowance changes 100 ft² to 100 × 1.10 = 110 ft² of adjusted demand.
- Unrounded bag demand is 110 / 25 = 4.4 bags.
- Round upward to ceil(4.4) = 5 complete 50 lb bags.
- Five bags represent 5 × 25 = 125 ft² of nominal coverage under the selected row.
These values are independent hand-derived arithmetic using the fixed 0.25 in row, its recorded approximate 25 ft² per 50 lb bag coverage, and the explicit 100 ft² / 10% inputs. They do not verify current product data, actual yield, substrate readiness, or product suitability.
Frequently asked questions
Can I enter a depth between the listed options?
No. The calculator intentionally uses only the five fixed TEC Level Set 300 rows at 0.125, 0.25, 0.5, 1, and 2 inches. It does not interpolate between rows or accept an arbitrary depth.
What does the 50 lb bag basis mean?
Each fixed coverage value is expressed as approximate square feet per one 50 lb bag. The bag basis belongs to the selected TEC Level Set 300 source row and should be confirmed against the current package and data sheet before purchase.
Does the calculator determine whether the product will work on my substrate?
No. It performs a quantity estimate from area, a fixed coverage row, and your allowance. Substrate preparation, primer, moisture conditions, minimum and maximum thickness, application limits, and product applicability require current manufacturer and project guidance.
Why can purchased coverage exceed adjusted area?
Bags are whole packages. When the fractional requirement is 4.4 bags, the purchase rounds to 5 bags, so the nominal coverage is 5 × 25 = 125 ft² under the selected row. Approximate coverage does not guarantee usable excess material.
Scope and limitations
Project types
- Floor preparation before tile
- Small level correction
- Large floor underlayment estimate
Check the calculator assumptions and product conditions for your project.
Calculation limits
- Only the five captured TEC Level Set 300 depth rows are supported; no arbitrary depth or interpolation is used.
- Coverage is approximate and tied to the selected 50 lb bag row; current product data and package information require confirmation.
- The calculator does not determine substrate readiness, primer needs, application limits, or product suitability.
- Actual yield, waste, and project conditions can differ from the recorded coverage rows.