Free Calculator · By SubcontractorHub Editorial Team · Published November 2026
Grout Calculator for the Joint, Not the Tile Count
A grout calculator on this page turns tile face and joint size into cubic feet. One hundred square feet of 12 by 12 inch tile with a 1/8 inch joint, 3/8 inch deep, is 0.065 cubic feet. Bags stay blank until you type the sheet.
Built by SubcontractorHub — the software contractors use to quote, finance, and run every job.
Book a DemoHow the Grout Calculator Measures a Joint
Area, face, width, depth. Density is optional.
100 square feet, a 12 by 12 face, and a 1/8 by 3/8 joint are the numbers in the boxes. They are not a brand chart. Pounds stay blank until you type a density.
This grout calculator reads 100.0 square feet as 0.065 cubic feet of joint. No pounds, because no density was typed. No bag count.
All calculations are estimates based on historical information and should be verified by the user.
Important: density is typed
All calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.
This Grout Calculator Is Not a Tile Count
The piece count lives on the tile calculator. That page says it does not include grout. This page starts after the tile is counted. A smaller face with the same spacer uses more joint per square foot, which is why the grout calculator asks for the tile size instead of a flat pounds-per-square-foot guess.
Mortar that beds brick or block is the mortar calculator. A wall counted on a nominal block face is the concrete block calculator. Neither of those is a sanded grout joint between ceramic tile.
Worked joint
Area 100 square feet. Tile 12 inches by 12 inches. Joint width 0.125 inch. Joint depth 0.375 inch. The grout calculator returns 0.065 cubic feet. Type the pounds per cubic foot from the bag you are buying if you need weight. Type the bag weight if you need a count. No default density was fetched, so none is filled in.
| Line | Input | Example |
|---|---|---|
| Area | typed square feet | 100 |
| Face | length × width, inches | 12 × 12 |
| Joint | width × depth, inches | 0.125 × 0.375 |
| Volume | the formula above | 0.065 cu ft |
| Pounds and bags | only if typed | blank |
How should you order the joint?
- Square feet of tile that will actually get a joint, not the whole room if a border is a different size.
- The face you are laying, in inches, from the tile, not from a nominal name.
- Spacer width and the depth of the joint, which is not the thinset under the tile.
- Pounds per cubic foot from that product's sheet, or stop at cubic feet.
- Pounds per bag from the bag, if you want a count.
- No price on this page.
What the Grout Calculator Leaves Out
A public search for a grout calculator returned brand tools, including Merkrete, Mapei, and Ceresit, plus retailer estimators. Their coverage tables were not fetched in full, so they are not printed here. If the bag in the truck lists pounds per 100 square feet for your exact tile and joint, use that line and treat this cubic-foot figure as the geometry check.
Sanded versus unsanded is a product choice the joint width often drives. This page does not pick the product. It also does not add waste. If you want extra, raise the area before you read the result, and say so on the order.
Flooring that is sold by the carton, not by the joint, is the laminate flooring calculator. Carpet cut from a roll is the carpet calculator. Neither of those fills a grout line.
Frequently Asked Questions
How does the grout calculator get cubic feet?
It multiplies the tiled area by (tile length plus tile width) divided by (tile length times tile width), then by joint width and joint depth, then divides by 12. A 100 square foot field of 12 by 12 inch tile with a 1/8 inch joint that is 3/8 inch deep is 0.065 cubic feet. No density is applied until you type pounds per cubic foot.
Does this grout calculator count bags?
Only after you type pounds per cubic foot and pounds per bag. No bag yield was fetched. The tile calculator still counts pieces and does not fill a joint.
Is joint depth the same as thinset thickness?
No. Joint depth here is the grout line, usually about the thickness of the tile. Thinset under the tile is not added. No thinset coverage was fetched.
Does a wider joint change the grout calculator?
Yes. Joint width is in the product. A wider spacer on the same tile raises the cubic feet. The page does not pick a spacer for you.
Write the Joint, Then Price the Bag Elsewhere
Cubic feet are geometry. The bag sheet is the weight.
Get a Free DemoAll calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.