Solve backwards
How much tile will my bag of grout fill?
- 25 lbThe example worked below
- Grout CalculatorEvery figure is its own
You have
How much grout?
That is 25 lb(11.3 kg). Worked by the Grout Calculator at the settings below.
The settings it uses
- Tile length
- 24 in
- Tile width
- 24 in
- Joint width
- 0.12 in
- Joint depth
- 0.31 in
- Grout density (mixed)
- 99.9 pcf
- Waste allowance
- 10
What it will do
901 sq ft of tiled floor
83.8 m²
One tiled floor. Enough for a tiled floor about 30 × 30 ft.
Or several. About 8 tiled floors of the size the Grout Calculator opens on: a tiled floor about 10.5 × 10.5 ft.
Check it forwards
- Area to grout
- 901 sq ft
- It asks for
- 25 lb
- You have
- 25 lb
The Grout Calculator asks for 25 lb at that size.
If you had more, or less
Around your amount
Each worked by the Grout Calculator at the same settings.
Half
12.5 lb
451 sq ft
a tiled floor about 21.2 × 21.2 ft
Yours
25 lb
901 sq ft
a tiled floor about 30 × 30 ft
Half as much again
37.5 lb
1,352 sq ft
a tiled floor about 37 × 37 ft
Double
50 lb
1,803 sq ft
a tiled floor about 42 × 42 ft
Common amounts
What each amount of grout covers
The sizes it is usually sold in, each worked by the Grout Calculator at the settings above.
| You have | It covers | As one tiled floor | Average tiled floors |
|---|---|---|---|
| 10 lb(4.5 kg) | 361 sq ft(33.5 m²) | a tiled floor about 19 × 19 ft | 3 |
| 25 lb(11.3 kg) | 901 sq ft(83.8 m²) | a tiled floor about 30 × 30 ft | 8 |
| 50 lb(22.7 kg) | 1,803 sq ft(168 m²) | a tiled floor about 42 × 42 ft | 16 |
Big tiles and thin joints stretch it
The calculator works the joints out as a grid: the share of the floor that is joint rises as tiles get smaller and joints wider. At its opening 600 mm (24 inch) tiles and 3 mm (1/8 inch) joints, under one per cent of the floor is joint, so a small bag covers a large floor. Going from a 2 mm to a 5 mm joint more than doubles the grout.
Planks and mosaics take more
A plank tile of 1200 by 200 mm has more joint per square metre than a 600 mm square covering the same floor, because its narrow shape puts a joint close to every point; a mosaic is almost all joint by comparison. Set the tile and joint in the calculator to your own, and the floor here shrinks accordingly.
Joints full to the face, and a tenth lost
Joint depth is taken as the tile's thickness, full from the bed to the face — clean out adhesive that squeezed up, or the joint takes less grout and cracks. Ten per cent is carried for grout left in the bucket, on the float and washed off the face, and read backwards it comes off what you have.
How the answer is worked
Nothing here is a second formula. The Grout Calculator runs forwards — a size in, a quantity out — and this page grows its own starting tiled floor in proportion until the quantity it asks for is what you have. Where it rounds up to whole containers, the answer is the largest size before the next one would be needed.
Where the calculator adds an allowance for cuts or breakage when you order, the same allowance comes off here, because it is the same calculator: a stack you already own finishes less than its face value. Where it adds none, neither does this page — the settings beside the answer say which.
Grout Calculator
runs it forwardsWork out the grout a tiled floor or wall takes from the tile size, the joint width and the joint depth, by weight and in bags.
Work out what to buy insteadSolve backwards
Other things you might already have
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How much ground will my gravel cover?
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How big a bed will my topsoil fill?
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How big a raised bed will my soil fill?
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Solve backwards
Start from what is already in the yard
Paint, sheets, rolls, bags and pieces, each read the other way by the calculator that orders it.
The calculator's own figures
Nothing is estimated twice: the page runs the same calculator you would order with.
The largest size that fits
Where a calculator rounds up to whole containers, the answer stops before the next one.
Both unit systems
Gallons and litres, square feet and square metres, side by side.
Frequently asked questions
- How much tiled floor does 25 lb of grout cover?
- At the Grout Calculator's own settings, 901 sq ft (83.8 m²) — a tiled floor about 30 × 30 ft. That is about 8 tiled floors of the size the calculator opens on: a tiled floor about 10.5 × 10.5 ft. Every figure follows the settings, which you can change in the calculator.
- How much tiled floor does 10 kg of grout cover?
- At the Grout Calculator's own settings, 71.6 m² (770 sq ft) — a tiled floor about 8.5 × 8.5 m. That is about 7 tiled floors of the size the calculator opens on: a tiled floor about 3.2 × 3.2 m. Every figure follows the settings, which you can change in the calculator.
- How many square feet does a 25 lb bag of grout cover?
- It depends almost entirely on tile size and joint width. With 24 inch tiles and 1/8 inch joints, a 25 lb bag fills a very large floor — several hundred square feet; with 4 inch tiles and 3/16 inch joints, a small fraction of that. The bag's chart, or the grout calculator with your tile, gives the figure.
- How wide should grout joints be?
- Rectified porcelain is often laid at 2 mm (about 1/16 inch), ordinary floor tile at 3 to 5 mm (1/8 to 3/16 inch), and handmade or rustic tile wider. Grout goes in proportion to the joint width, so a wider joint uses noticeably more for the same tiles.
- Should grout go in movement joints?
- No. Internal corners, edges, where tiling meets a bath or tray, and intervals across a large floor take a flexible sealant, not grout, and grout put into them cracks. The calculator counts them as grout, so on a room with many of them the figure reads slightly high.