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Use our thinset mortar calculator to estimate bag count, tile coverage, and mortar needs for floors, walls, bathrooms, and kitchens.
| Formula | Meaning |
|---|---|
| Area = Length × Width | Installation area |
| Adjusted Area = Area × (1 + Waste% ÷ 100) | Area including waste allowance |
| Bags = ceil(Adjusted Area ÷ Coverage per Bag) | Required bags, always rounded up |
| Purchased Weight = Bags × Bag Weight | Total mortar weight to buy |
Need to lay new tiles? First, find out how much thinset you need. Our thinset mortar calculator makes this job easy. Enter your floor or wall size, bag coverage, and waste rate. Then get your estimated bag count in seconds.
Use this tool for a bathroom, kitchen, or large floor. It works for both square feet and square meters. You can also use it to plan a tile job and avoid buying too much mortar.
You only need a few simple steps to find the right amount.
Area = Length × Width
Adjusted Area = Area × (1 + Waste Rate ÷ 100)
Bags Needed = Round Up (Adjusted Area ÷ Coverage per Bag)
Total Mortar Weight = Bags Needed × Bag Weight
For example, add 10% to the area to allow for extra use. This is a guide, not a fixed rule. Your tile size, trowel, and floor shape can change how much thinset you need.
Enter the size. Add the length and width of your floor or wall.
Choose your units. Use feet, inches, meters, or centimeters.
Enter bag coverage. Check the product label for its stated coverage.
Set the waste rate. Use 10% as a starting point if you are unsure.
Calculate your result. See the area, bag count, and total mortar weight.
The result helps you plan your job before you buy. Always check the maker's coverage chart for your exact thinset.
Say your kitchen floor is 10 feet long and 12 feet wide. You plan to use a 50 lb bag of thinset. The product covers 60 square feet per bag. You also allow 10% extra.
Step 1: Find the area.
10 × 12 = 120 sq ft
Step 2: Add 10% extra.
120 × 1.10 = 132 sq ft
Step 3: Find the bag count.
132 ÷ 60 = 2.2 bags
Step 4: Round up.
You need 3 bags of thinset mortar.
Three 50 lb bags give you 150 lb of mortar to work with. This estimate assumes the stated coverage fits your tile and trowel.
Our thinset mortar calculator helps you plan a tile job with less guesswork. Use it for floors, walls, bathrooms, and kitchens. Enter the right coverage rate to get a useful estimate.
For brands like MAPEI, VersaBond, and Schluter, check the product guide first. Coverage can vary by product, bag size, and trowel notch. A good estimate can save time and help cut waste.
Find the area, add your waste rate, then divide by the coverage per bag. Round up to get the number of bags to buy.
It depends on the product and trowel. Some products may cover about 60 sq ft with one notch size, while others cover more. Check the maker's chart.
Mix only what you can spread and use within the product's stated working time. Start with a small batch if you're new to tile work. Never add water to mortar that has begun to set.
Tile size alone isn't enough to give an exact answer. Measure the full area, then check the coverage for your mortar and trowel. Large tiles may need a larger notch or back-buttering.
Yes. Enter the bathroom floor or wall size. For wet areas, choose a mortar approved for that tile and setting surface.
You can use this online calculator in a web browser on a phone, tablet, or computer. No separate app is needed if the page works on your device.