1520
Grout sealer chart
Put your area, coverage per bottle and waste allowance in: 400 sq ft at 10% waste needs 2.20 bottles exact, order 3.
★ CONSTRUCTION · TILE · COVERAGE CHART
Grout Sealer Chart: 3 Bottles for 400 Sq Ft at 10% Waste
On the defaults — 400 square feet at 10% waste with 200 square feet per bottle coverage — you need 440.00 square feet of sealer coverage, 2.20 bottles exact, so order 3 bottles. This is the GROUT-SEALER version — area times waste divided by coverage, with a lookup table for every common area and waste level — the thinset-chart page is the THINSET version — the same divide-and-round-up model counted in thinset bags; the grout-chart page is the GROUT version — the same model counted in grout bags; the mortar-chart page is the MORTAR version — the same model counted in mortar bags; and the paint-chart page is the PAINT version — the same model counted in topcoat gallons.
What does 2.20 bottles, order 3, mean?
It means that 400 square feet of grout, with a 10% waste allowance, need 440.00 square feet of sealer coverage, and at 200 square feet per bottle that is 2.20 bottles — two full bottles plus a fifth of a third — and because sealer is sold by the bottle, you order 3. The rounding is the whole story in miniature: a partial bottle cannot be bought in the quantity needed, so any fraction, however small, becomes a whole bottle. The part people get wrong is rounding to the nearest bottle instead of up: 2.20 rounded to the nearest is 2 here, and 2 bottles cover only 400 square feet, leaving 40.00 square feet without sealer. The other part people get wrong is the exact fit: 440 square feet of coverage need exactly 1.00 bottle at 440 square feet per bottle, and order exactly 1, because the rounding is up to the next whole bottle, not up plus one — an exact fit needs no spare bottle from the rounding, though a spare for spillage is a separate decision.
Three things to check before you trust the number
Is 200 square feet per bottle right for your sealer and grout? Two hundred square feet is the figure this page uses, a mid-range figure for a standard bottle on sanded grout. Unglazed tile and wide joints drink more sealer and cover fewer feet, so the same 400 square feet at 100 square feet per bottle would need 4.40 bottles, order 5, not 3 — grout type changes the count completely, even though the area and waste are unchanged. Check your sealer maker’s coverage table for your grout width and tile type, and enter that figure rather than trusting the default for a different joint.
Did you measure every area? The area entered here must be the total of all grouted surfaces, not the largest single room: a home with 400 square feet downstairs plus bathrooms, halls and backsplashes has more than 400 square feet to seal. The 200-square-foot branch needs 1.10 bottles, order 2, against the 2.20-bottle headline, so missing one room understates the order by whole bottles on a bigger job. Measure every area, add them before dividing, and do not subtract small gaps unless your sealer maker says to.
Are you counting waste, or a second coat? This page adds 10% for waste — overlap, spillage and second passes on thirsty joints — and that is not a second coat. A second coat doubles the area first: 400 square feet twice-coated is 800 square feet before waste, which is 880.00 square feet with waste and 4.40 bottles, order 5. Treating a second coat as waste, or waste as a second coat, misstates the order by whole bottles either way, so decide the coats first and let the waste percentage stay at waste.
Worked example
On the defaults: 400 square feet, 200 square feet per bottle, 10% waste.
- Needed area: 400 × 1.10 is 440.00 square feet.
- Exact bottles: 440.00 ÷ 200 is 2.20 bottles.
- Order: 2.20 rounded up is 3 bottles — the 0.20 is a fifth of a bottle that must be bought whole.
- Check: 3 bottles cover 600 square feet, which is more than the 440.00 needed; 2 bottles cover only 400, which is not enough.
And the other way: the area behind 2.20 bottles is 400 square feet, the coverage behind 2.20 bottles is 200 square feet per bottle, and the waste behind 2.20 bottles is 10%. A job at 440 square feet per bottle orders exactly 1 bottle, and a 1,000-square-foot job at 200 square feet per bottle and 0% waste lands exactly on 5.00 bottles, order 5.
Every branch, checked
- 200 square feet, 200 square feet per bottle, 10% waste: 200 square feet, 200 square feet per bottle, 10% waste: 1.10 bottles exact — order 2 bottles.
- 800 square feet, 200 square feet per bottle, 10% waste: 800 square feet, 200 square feet per bottle, 10% waste: 4.40 bottles exact — order 5 bottles.
- 400 square feet, 100 square feet per bottle, 10% waste: 400 square feet, 100 square feet per bottle, 10% waste: 4.40 bottles exact — order 5 bottles.
- 400 square feet, 200 square feet per bottle, 20% waste: 400 square feet, 200 square feet per bottle, 20% waste: 2.40 bottles exact — order 3 bottles.
The reverses, worked backwards
- Area behind 2.20 bottles: 400 sq ft — at 400 sq ft the figures are 2.20 bottles exact — order 3 bottles.; at the lower neighbor the figures are 1.93 bottles exact — order 2 bottles.; at the upper neighbor the figures are 2.48 bottles exact — order 3 bottles..
- Coverage behind 2.20 bottles: 200 sq ft per bottle — at 200 sq ft per bottle the figures are 2.20 bottles exact — order 3 bottles.; at the lower neighbor the figures are 2.93 bottles exact — order 3 bottles.; at the upper neighbor the figures are 1.76 bottles exact — order 2 bottles..
- Waste behind 2.20 bottles: 10% waste — at 10% waste the figures are 2.20 bottles exact — order 3 bottles.; at the lower neighbor the figures are 2.10 bottles exact — order 3 bottles.; at the upper neighbor the figures are 2.30 bottles exact — order 3 bottles..
What the defaults assume
The defaults are 400 square feet, 200 square feet per bottle and 10% waste, so the headline is one coat of sealer over a medium grouted floor at a common joint width. The model is a multiplication, a division and a ceiling: needed area is area times one plus the waste percentage, exact bottles are needed area divided by coverage per bottle, and the order rounds exact bottles up to the next whole bottle, with a 1e-12 epsilon so an exact whole number orders exactly that many. Bottle coverage differs by grout — the 200-square-feet figure is mid-range, and a thirstier joint covers fewer feet, so enter the coverage for the bottle and grout you will actually use. The area reverse is checked at 50 square feet either side, because 50 square feet at 10% waste is 55 square feet, about 0.28 bottles; the coverage reverse is checked at 50 square feet either side, because 440.00 over 150 is 2.93 bottles and over 250 is 1.76; the waste reverse is checked at 5% either side, because 5% of 400 is 20 square feet, about 0.10 bottles. The model does not include second coats, grout itself, backer board, fasteners, or tools — count those separately.
Lookup table: bottles by area and waste
Each row already includes its waste allowance at 200 square feet per bottle: needed area is the area times one plus the waste percentage, exact bottles are needed area divided by 200, and the order column rounds up. A row that lands exactly on a whole number orders exactly that many — no extra bottle is added for an exact fit. For a different bottle coverage, enter your own figure in the calculator above: a thirstier joint covers fewer feet, so the order rises.
| Area | Waste | Needed area | Exact bottles | Order |
|---|---|---|---|---|
| 100 sq ft | 0% | 100.00 sq ft | 0.50 | 1 bottle |
| 100 sq ft | 5% | 105.00 sq ft | 0.53 | 1 bottle |
| 100 sq ft | 10% | 110.00 sq ft | 0.55 | 1 bottle |
| 100 sq ft | 15% | 115.00 sq ft | 0.58 | 1 bottle |
| 250 sq ft | 0% | 250.00 sq ft | 1.25 | 2 bottles |
| 250 sq ft | 5% | 262.50 sq ft | 1.31 | 2 bottles |
| 250 sq ft | 10% | 275.00 sq ft | 1.38 | 2 bottles |
| 250 sq ft | 15% | 287.50 sq ft | 1.44 | 2 bottles |
| 500 sq ft | 0% | 500.00 sq ft | 2.50 | 3 bottles |
| 500 sq ft | 5% | 525.00 sq ft | 2.63 | 3 bottles |
| 500 sq ft | 10% | 550.00 sq ft | 2.75 | 3 bottles |
| 500 sq ft | 15% | 575.00 sq ft | 2.88 | 3 bottles |
| 1000 sq ft | 0% | 1000.00 sq ft | 5.00 | 5 bottles |
| 1000 sq ft | 5% | 1050.00 sq ft | 5.25 | 6 bottles |
| 1000 sq ft | 10% | 1100.00 sq ft | 5.50 | 6 bottles |
| 1000 sq ft | 15% | 1150.00 sq ft | 5.75 | 6 bottles |
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Needed area | area × (1 + waste ÷ 100) | 440.00 sq ft — 400 × 1.10. |
| Exact bottles | needed area ÷ coverage per bottle | 2.20 bottles — 440.00 ÷ 200. |
| Order | exact bottles rounded up | 3 bottles — 2.20 rounds up. |
| Area behind a target exact figure | exact bottles × coverage per bottle ÷ (1 + waste ÷ 100) | 400 sq ft — 2.20 × 200 ÷ 1.10. |
| Coverage behind a target exact figure | needed area ÷ exact bottles | 200 sq ft per bottle — 440.00 ÷ 2.20. |
| Square feet covered by the order | order × coverage per bottle | 600 sq ft — 3 × 200, more than the 440.00 needed. |
| Square feet short on one fewer bottle | needed area − (order − 1) × coverage per bottle | 40.00 sq ft — 440.00 − 2 × 200, which is why rounding down fails. |
| 200 square feet, 200 square feet per bottle, 10% waste | same model | 1.10 bottles exact — order 2 bottles. |
| 800 square feet, 200 square feet per bottle, 10% waste | same model | 4.40 bottles exact — order 5 bottles. |
| 400 square feet, 100 square feet per bottle, 10% waste | same model | 4.40 bottles exact — order 5 bottles. |
| 400 square feet, 200 square feet per bottle, 20% waste | same model | 2.40 bottles exact — order 3 bottles. |
| Area behind 2.20 bottles | reverse | 400 sq ft: 2.20 bottles exact — order 3 bottles. |
| Coverage behind 2.20 bottles | reverse | 200 sq ft per bottle: 2.20 bottles exact — order 3 bottles. |
| Waste behind 2.20 bottles | reverse | 10% waste: 2.20 bottles exact — order 3 bottles. |
| 0 square feet | same model | 0.00 bottles exact — order 0 bottles. |
| Negative area | same model | Area — 0 or more. |
| Zero coverage | same model | Coverage — more than 0. |
| 440 square feet per bottle | same model | 1.00 bottles exact — order 1 bottles. |
Who uses this
- A DIYer sealing a new floor — 400 square feet at 10% waste is 3 bottles, with the lookup table covering every other area and waste level without re-measuring.
- A tile installer ordering for a job — the branches show how the order moves with area, coverage and waste, so a thirstier grout is repriced before ordering.
- A homeowner comparing grout types — the 100-square-feet branch shows what a thirsty joint really costs in bottles, before the job starts.
- An estimator checking a quote — the reverses recover the area, coverage or waste behind any quoted bottle count, which checks a quote without re-measuring the job.
Accuracy & limitations
Figures are the model’s own arithmetic on the numbers you type, computed from unrounded values and displayed rounded HALF_UP to 2dp, with orders rounded up using a 1e-12 epsilon so exact fits are not over-ordered. The main limitation is the coverage figure, not the arithmetic: bottle coverage varies widely with grout width and tile type — a wide joint on unglazed tile drinks far more sealer than a narrow joint on glazed tile — so check your sealer maker’s coverage table for your grout and enter your own figure when your joint differs. This page is a calculation tool, not trade advice — follow the sealer maker’s instructions for application, drying and curing.
Cite this calculator
400 square feet at 10% waste with 200 square feet per bottle coverage needs 440.00 square feet, 2.20 bottles exact: order 3 bottles. Source: Bright Side Kit, https://brightoolbox.com/grout-sealer-chart/, accessed 29 October 2026.
Frequently asked questions
How many square feet does one bottle of grout sealer cover?
This page uses 200 square feet per bottle, a mid-range figure for a standard bottle on sanded grout. A thirstier joint covers fewer feet, so the same 400 square feet at 100 square feet per bottle needs 4.40 bottles, order 5 — the calculator divides by whatever you enter, so the answer stays honest for your grout type.
Is grout sealer the same as grout?
No: grout is the cement or epoxy that fills the joints between tiles, while grout sealer is the protective coating brushed or sprayed over cured grout to resist stains and moisture. Both are counted by coverage, which is why the two charts use the same divide-and-round-up arithmetic, but sealer never replaces grout itself.
Why add 10% waste?
Because material is lost to overlap, spillage and second passes on thirsty joints: the 10% allowance covers the sealer that never ends up as a finished coat. Without it, a job that computes to exactly 2.00 bottles would run dry on the last stretch of floor, and the waste percentage is what keeps the order honest for real application.
Why round up instead of to the nearest bottle?
Because a partial bottle cannot be bought in the quantity needed, and rounding down leaves grout unsealed: 2.20 bottles rounded to the nearest is 2, and 2 bottles cover only 400 of the 440.00 square feet needed. Rounding up guarantees the whole area is covered; the extra fraction is the price of buying whole bottles.
What if the exact figure is already a whole number?
Then you order exactly that many: a job at 440 square feet per bottle needs exactly 1.00 bottle and orders 1, not 2, and the epsilon in the rounding protects exact fits, so a job that lands on a whole number is not charged an extra bottle for nothing.
Does the waste allowance cover a second coat?
No: waste and coats are different things. Waste is the extra 10% for overlap, spillage and second passes on one coat; a second coat doubles the area first, so 400 square feet twice-coated is 800 square feet before waste, which is 880.00 square feet with waste and 4.40 bottles, order 5. Decide the coats first, then let waste stay at waste.