Product coverage + tiled area + packages
Thinset Calculator
Estimate how many thinset mortar packages to buy using the coverage range for your product and trowel size.
Example only
- Extra allowance
- 10%
- Order area
- 110 sq ft
- Low coverage
- 55 sq ft / bag
Your result uses your own inputs, not this example.
How to measure
Where to find thinset coverage
Mortar coverage depends on the product and trowel. Match the coverage row on the product sheet to the trowel you plan to use.
Measure the area
Add the square footage that will actually receive tile. Exclude untiled openings.
Read product coverage
Use the low and high square-foot coverage shown for one package and your trowel.
Check before buying
Substrate flatness, tile backs, and application can change real coverage. Confirm with the product sheet.
The math
From coverage to whole bags
Example: 100 sq ft with 55–65 sq ft per bag
- Add 10% extra: 100 × 1.10 = 110 sq ft of planned coverage.
- At 55 sq ft per bag, 110 ÷ 55 = 2 whole bags to buy.
- At 65 sq ft per bag, 110 ÷ 65 also rounds up to 2 bags.
The lower end of the product’s range gives the conservative purchase count.
Source behind this calculator
Check the product you plan to use
MAPEI’s mortar coverage tables show different square-foot ranges for different trowel sizes, and note that actual coverage can vary.
MAPEI mortar coverage chart ↗Related tools