Grout Calculator
Figure out how much grout you need. Works for standard, hexagon, and penny round tiles, in inches or millimeters.
Includes 10% overage
Square Pattern
40
sq ft
12×12"
tile size
1/8"
grout
Calculators & Guides
- Hexagon Tile Grout CalculatorGrout estimates for hex tile, measured flat-to-flat.
- Penny Tile Grout CalculatorAccurate estimates for 3/4" and 1" penny round tile.
- Subway Tile Grout CalculatorPreset for 3×6 subway tile backsplashes and showers.
- Large Format Tile Grout CalculatorPreset for 12×24 and other large porcelain tile.
- Metric Grout CalculatorTile sizes in mm, area in m², and results in kg.
- How Much Grout Do I Need?The formula, worked examples, and how many bags to buy.
- Sanded vs. Unsanded GroutWhich grout to use based on joint width and tile type.
Frequently Asked Questions
How much grout do I need per square foot?
It depends on tile size, joint width, and tile thickness. For 12x12 inch tiles that are 3/8 inch thick with 1/8 inch joints, you need about 7 lbs of sanded grout per 100 square feet, so a 25 lb bag covers roughly 350 square feet. Small tiles need far more: 2x2 inch mosaics with the same joint width need about 27 lbs per 100 square feet. Enter your exact tile size above for an estimate.
Should I use sanded or unsanded grout?
Use sanded grout for grout lines 1/8 inch (3mm) or wider. Use unsanded grout for grout lines less than 1/8 inch. Sanded grout contains fine sand particles that provide strength and prevent shrinking in wider joints. Unsanded grout flows better into narrow spaces and is less likely to scratch polished stone or glass tiles.
How do I calculate grout for hexagon tiles?
Select the "Hexagon Tiles" option and enter the flat-to-flat width (the distance between two opposite straight edges). A hexagon needs about the same amount of grout as a square tile of the same width, so a 2 inch hex uses roughly as much grout as a 2x2 inch square. Smaller hexagons need more grout per square foot because there are more joints.
Does the grout calculator work in metric?
Yes. Switch the calculator to mm / kg to enter your area in square metres and tile size, thickness, and joint width in millimetres, and get results in kilograms. The calculator picks metric automatically if your browser is set to a metric country, and remembers your choice.
How much extra grout should I buy?
We recommend buying 10-15% extra grout to account for waste during mixing, material left in the bucket, uneven grout lines, and future touch-ups or repairs. Our calculator includes an adjustable overage option (0%, 5%, 10%, or 15%) so you can plan accordingly. It's always better to have a little extra than to run out mid-project and risk color mismatches between batches.
What is grout coverage and how is it calculated?
Grout coverage refers to how much area a given amount of grout will fill. The industry-standard formula calculates the total volume of grout joints by multiplying the total grout line length by the joint width and depth (tile thickness). This volume is then converted to weight using the grout's density. Sanded grout is denser (~104 lbs/ft³) than unsanded grout (~86 lbs/ft³), which is why you need slightly more sanded grout by weight for the same project.