Tile Calculator
Free tile calculator. Enter room and tile size to get the number of tiles, boxes, grout and thinset you need, with waste allowance and grout gap built in.
About This Free Online Tile Calculator
Our free tile calculator works out exactly how many tiles to buy for a floor, wall, backsplash or patio. Enter the room length and width, the tile width and length in inches, the grout gap and a waste percentage, and the tool returns the number of tiles you need, the number of boxes (if you enter tiles per box), plus estimated grout and thinset. The waste allowance covers cuts and breakages, and the grout gap is included in the layout math so your count is accurate. Everything runs instantly in your browser — ideal for tilers, bathroom renovators and DIYers.
Features of Our Tile Calculator
- Tile count from room size, tile size and grout gap
- Box count when you enter tiles per box
- Adjustable waste percentage for cuts and breakages
- Estimated grout and thinset for the area
- Works for floors, walls, backsplashes and patios
- 100% client-side and private — instant results, no signup
How to Use the Tile Calculator
Using this tool is simple and requires no signup or registration. Follow these steps:
- Enter the room length and width in feet.
- Enter the tile width and length in inches, and the grout gap.
- Optionally enter tiles per box and a waste percentage.
- Read off the tiles, boxes, grout and thinset to buy.
Frequently Asked Questions About Tile Calculator
How do I calculate how many tiles I need?
Divide the room into rows and columns: tiles across = ceiling(room length ÷ (tile width + gap)) and rows = ceiling(room width ÷ (tile length + gap)). Multiply for the total, then add waste. This calculator does the division and rounds up for you.
How much waste should I add for tile?
Plan on 10–15% extra for straight (grid) layouts and 20–25% for diagonal or herringbone patterns, which create more offcuts. The waste slider lets you match your layout.
Should I include the grout gap?
Yes. The grout gap adds to each tile’s footprint, which changes how many fit per row. Including it gives an accurate count; ignoring it underestimates tiles at the edges.
How much grout and thinset do I need?
As a rule of thumb, one 25 lb bag of grout covers about 100 sq ft of 12-inch tile with a 1/4 inch gap, and a 50 lb bag of thinset covers about 75 sq ft. The calculator gives these estimates for your area.
Is this tile calculator free?
Yes, completely free with no signup. All calculations run in your browser, so nothing is uploaded.
Why Choose Text Toolbox?
Text Toolbox provides free, private, and instant online text tools. Unlike other text utility websites that require signup accounts or send your data to servers, all our tools process your text entirely in your browser. This means your content never leaves your device — we cannot see it, store it, or share it. Our tools are fast, lightweight, and work on any device with a modern web browser.