Grout Calculator
Free grout calculator: estimate bags, weight, and volume for any tile.
Last updated: March 19, 2026
Enter Tile and Joint Details
Coverage Area
Tile Size
Grout Joint
In most cases, filled depth is close to the tile thickness or a little less.
Use actual filled joint depth when possible. Wider joints and smaller tiles increase grout usage quickly.
Product Assumptions
If you do not have the bag in front of you, the standard option is usually fine for planning.
Results
Calculation Steps
This is a planning estimate. Actual coverage can shift based on the grout brand, tile edges, and jobsite conditions.
How to Use This Calculator
1. Enter area
Start with the total area you plan to grout, then choose square feet or square meters.
2. Match your joint
Use your installed tile size, actual joint width, and filled depth instead of guessing from the bag.
3. Buy by bags
Check the estimated grout weight and rounded-up bag count, then match it to the product you plan to buy.
How We Calculate
Example Calculation:
- • Area: 120 sq ft = 17,280 sq in
- • Tile: 12" × 12" with 1/8" joints and 1/4" filled depth
- • Joint area per tile = module area - tile face area
- • Total joint volume = tile count × joint area × depth
- • Weight = volume × grout density
- • Bags needed = weight ÷ bag size, then rounded up
Pro-grade calculation: based on industry-standard joint volume formulas.