Grout Calculator
Estimate how much tile grout to buy — sanded, unsanded, or epoxy — from your tile size, grout joint width, and area, with U.S. pricing, bag counts, sealer, and a downloadable PDF material list.
Grout yield varies by brand, joint width, and tile size — always check the bag. Match sanded, unsanded, or epoxy grout to your joint and tile. For planning purposes only.
| Joint | Grout (lbs) | Bags | Grout Cost | Cost / sq ft |
|---|
For your 100 sq ft of 12×12 tile. Wider joints and smaller tiles use more grout.
How to use the grout calculator
Four quick steps turn your tile size, joint width, and area into a full grout order — pounds, bags, sealer, and cost — for sanded, unsanded, or epoxy grout, with a joint comparison and a downloadable PDF.
Enter the area
Length × width in feet, add niches or borders, or type total square feet — or tap a preset like Backsplash 30.
Set tile & joint
Pick a tile size, set the tile thickness (grout depth), and choose the grout joint width from 1/16″ to 1/2″.
Pick grout, waste & prices
Choose sanded, unsanded, or epoxy, set the waste %, and enter grout, sealer, and labor prices.
Read results & save a PDF
Get pounds and bags, sealer bottles, a full cost breakdown, a joint comparison, and a material list.
How the grout estimate is calculated
Grout fills the joints between tiles, so the amount depends on your tile size, joint width, and tile thickness — not just the area. The calculator works out pounds per square foot, scales it to your area and waste, then converts to bags. Here is the exact math.
Worked example — 100 sq ft of 12″ × 12″ floor tile, 1/8″ joints, 3/8″ thick
Per sq ft: ((12+12) ÷ (12×12)) × 0.125 × 0.375 × 14.5 ≈ 0.113 lbs
Grout (+10%): 0.113 × 100 × 1.10 ≈ 12.5 lbs
Bags: 12.5 ÷ 25 = 0.5 → 1 bag
Coverage: 25 ÷ 0.113 ≈ 221 sq ft/bag | Grout cost: 1 × $22 = $22
≈ 12.5 lbs (1 × 25 lb bag), about $22 in sanded grout — one bag covers ~221 sq ft of this tile.
Grout estimating charts
Handy lookups for the questions people ask most — which grout to pick, and how tile size and joint width change how much you use. Figures use the calculator’s defaults (3/8″ tile depth, +10% waste), so always confirm your own bag label.
| Type | Joint range | Best for | Sealer | Typical U.S. price |
|---|---|---|---|---|
| Sanded grout | 1/8″ and wider | Floors & most walls; resists cracking | Yes, after cure | $18–$26 / 25 lb bag |
| Unsanded grout | 1/16″ to 1/8″ | Polished stone & glass; narrow joints | Yes, after cure | $16–$24 / 25 lb bag |
| Epoxy grout | Most widths | Kitchens, showers, wet & high-use areas | No — stain-proof | $60–$90 / kit |
Match the grout to the joint: sanded won’t fit the narrowest joints and unsanded cracks in wide ones. Epoxy works almost anywhere and never needs sealing, but costs more and sets fast.
| Tile size | Lbs / sq ft | Lbs / 100 sq ft | Coverage / 25 lb bag |
|---|---|---|---|
| Mosaic 2×2 | 0.68 | 74.8 lbs | ~37 sq ft |
| Subway 3×6 | 0.34 | 37.4 lbs | ~74 sq ft |
| Plank 6×24 | 0.14 | 15.6 lbs | ~177 sq ft |
| 12×12 | 0.11 | 12.5 lbs | ~221 sq ft |
| 12×24 | 0.085 | 9.3 lbs | ~294 sq ft |
| 24×24 | 0.057 | 6.2 lbs | ~441 sq ft |
At 3/8″ tile depth and +10% waste. Small tiles pack far more joint into each square foot — a 2×2 mosaic uses about 12× the grout of a 24×24 tile over the same area.
| Joint width | Grout type | Lbs / 100 sq ft | 25 lb bags |
|---|---|---|---|
| 1/16″ | Unsanded | 6.2 lbs | 1 bag |
| 1/8″ | Sanded / unsanded | 12.5 lbs | 1 bag |
| 3/16″ | Sanded | 18.7 lbs | 1 bag |
| 1/4″ | Sanded | 24.9 lbs | 1 bag |
| 3/8″ | Sanded | 37.4 lbs | 2 bags |
For 12×12 tile at 3/8″ depth, +10% waste. Doubling the joint width roughly doubles the grout. Wider joints also require sanded grout to resist cracking.
| Line item | Typical U.S. range | What moves it |
|---|---|---|
| Sanded grout | $18–$26 / 25 lb bag | Brand, color, additives |
| Unsanded grout | $16–$24 / 25 lb bag | Brand, color |
| Epoxy grout | $60–$90 / kit | Kit size, brand — covers less area |
| Grout sealer | ~$18 / bottle | Penetrating vs. membrane; ~150–400 sq ft |
| Professional install | set your own $/sq ft | Tile size, layout, prep — DIY = $0 |
2024–2025 U.S. ballparks matching the calculator’s defaults. Grout is a small line on most jobs; epoxy costs more per kit but skips sealer forever. Your local quotes will vary.
most grout
medium
least grout
Grout only lives in the joints (shown in orange). The more tiles you fit per square foot, the more joint length there is to fill — so tile size drives grout use more than anything else.
- Small tiles & mosaics — the most joint per sq ft, so the most grout; a 2×2 can use ~12× a large tile.
- Standard tile — a 12×12 at 1/8″ joints sits in the middle, about 0.11 lbs of grout per sq ft.
- Large format — big tiles have few joints, so the least grout, often under 0.06 lbs per sq ft.
Everything the calculator works out
One tile size and area gives you a complete grout order — the pounds and bags, the coverage per bag, and the sealer for cement grout, with a costed joint comparison.
Key figures every grout job depends on
Built for any tiling project
From a small backsplash to a whole tile floor, the same calculator scales to the tile, the joint, and the grout type.
Grouting a backsplash or bath floor and wants to buy the right number of bags without a wasted trip to the store.
- Start from a preset like Backsplash 30
- Match the grout type to your joint
- Buy one bag extra for touch-ups
Quoting tile work and needs grout, sealer, and labor per square foot in one place to bid quickly and accurately.
- Switch grout type per job
- Compare joint widths on cost
- Save the PDF material list for the quote
Speccing grout across rooms with different tile sizes and comparing epoxy versus cement on total cost.
- See how tile size drives grout use
- Weigh epoxy’s no-sealer upside
- Total bags and sealer for ordering
7 tips for an accurate grout order
Small habits keep your count right and your joints clean, consistent, and built to last.
Grout calculator FAQ
The quantities, coverage rates, and U.S. cost questions people ask most before buying grout.
Grout use depends on your tile size, joint width, and tile thickness, not just the floor area. Measure those, pick a grout type, and add a small waste allowance.
The calculator turns that into pounds of grout and then bags. A 100 sq ft floor of 12×12 tile with 1/8-inch joints needs about 12.5 lbs of grout — roughly one 25 lb bag.
Sanded grout has fine sand that resists shrinking and cracking, so it’s used for joints 1/8 inch and wider. Unsanded grout is smoother and won’t scratch polished stone or glass, but only belongs in narrow joints from 1/16 to 1/8 inch.
Epoxy grout is highly stain and chemical resistant and needs no sealer, which makes it ideal for kitchens, showers, and wet areas — though it costs more and is harder to work with.
It depends on the tile size and joint width. At 1/8-inch joints and 3/8-inch thick tile, a 12×12 tile uses about 0.11 lbs of grout per square foot.
The same area in 2×2 mosaic uses around 0.68 lbs per square foot, while a large 24×24 tile uses only about 0.06 lbs — because smaller tiles pack far more grout line into each square foot.
Yes, dramatically. More and smaller tiles mean more linear feet of joint packed into every square foot, so they use far more grout than large-format tiles.
At the same joint width, a 2×2 mosaic can use roughly 12 times the grout of a 24×24 tile over the same area. Wider joints add even more on top of that.
In the U.S., sanded and unsanded grout run about $16 to $26 per 25 lb bag, while epoxy kits are roughly $60 to $90 and cover less area.
A small backsplash or bath is often a single bag; a whole floor may take a few. Add grout sealer at about $18 per bottle for cement grout, or skip it entirely with epoxy.
Cement-based grout — both sanded and unsanded — should be sealed after it cures, usually 48 to 72 hours, and resealed periodically to resist stains and moisture.
Epoxy grout is already stain-proof and waterproof, so it never needs sealing. That’s one of the main reasons people choose it for wet and high-use areas despite the higher price.
Allow about 10% to cover spillage, mixing loss, and future re-grouting, and bump it higher for mosaics and intricate layouts where more is wasted on the board.
Buy all your grout from one batch or lot number for color consistency, and keep a little sealed for touch-ups — dye lots can shift between production runs.
It depends on the tile and the look you want. A 1/16-inch joint suits rectified or polished tile, 1/8 inch is the most common all-purpose width, and 3/16 to 1/4 inch works for floors and rustic or handmade tile.
Joints up to 1/2 inch are used for slate and flagstone. Wider joints need sanded grout and use noticeably more of it, which the calculator’s joint comparison makes clear.
General Estimating Notice: This calculator estimates grout quantity, bags, sealer, and cost from your tile size, joint width, tile thickness, area, and the prices you enter, using a standard industry coverage formula and typical 2024–2025 U.S. figures. Actual yield varies by brand, mixing, joint depth, and tile shape, so always check the bag’s coverage chart. Match sanded, unsanded, or epoxy grout to your joint width and tile, and follow the manufacturer’s instructions for mixing, curing, and sealing. For planning purposes only.