How much grout for a tile floor?
Quick Answer
A 100 sq ft tile floor with 12×12-inch tiles and 3/16-inch joints needs about 1 bag (25 lbs) of sanded grout. Smaller tiles or wider joints require more grout — a floor with 4×4 tiles may need 3 bags. Use the tile manufacturer's grout coverage chart for exact quantities.
Quick Reference Table
| Tile size × joint width | Grout bags for 100 sq ft |
|---|---|
| 4×4" tile, 1/8" joint | 3 bags (25 lbs each) |
| 12×12" tile, 3/16" joint | 1 bag |
| 12×12" tile, 1/4" joint | 1.5 bags |
| 18×18" tile, 3/16" joint | 0.75 bags |
| 24×24" tile, 1/8" joint | 0.5 bags |
How to Calculate It Yourself
- 1
Find the grout coverage on your grout bag label — it lists sq ft per bag by tile size and joint width.
- 2
If unavailable, use the formula: lbs per sq ft = (tile perimeter × joint depth × joint width) ÷ (tile area × 144) × grout density.
- 3
Simpler rule: add 10% to calculated amount for waste and touch-ups.
- 4
Mix in small batches — grout has a 30-minute working time.
Pro Tip
Buy grout from the same dye lot for consistency. Grout color shifts slightly between lots — even matching bags from different batches can show variation after installation.
Need an exact number for your specific dimensions?
Use the Tile Calculator →