Tile grout calculator
Estimate cement or epoxy grout kilograms and bags from tiled area, tile size, joint width, and depth.
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Tool guide
Tile grout calculator: how it works
Practical information to understand the result and use this tool correctly.
About Tile grout calculator
Enter the tiled area, or a rectangle of length and width, plus tile length, tile width, joint width, and joint depth. Coverage in kilograms per square metre is (tile length + tile width) divided by their product, times joint width, times joint depth, times a density factor. All tile and joint sizes are in millimetres. Bags to buy are that mass times one plus waste, divided by the bag size, rounded up.
A 600 by 600 mm tile with a 2 mm joint and 10 mm depth uses about 0.11 kg/m² of sanded grout before waste. A 75 by 150 mm subway tile with a 3 mm joint and 8 mm depth uses about 0.72 kg/m². A 25 mm mosaic with a 2 mm joint uses much more per square metre because there is more joint length. The density factors are planning values: 1.6 for sanded cement, 1.5 for unsanded, and 1.55 for epoxy.
Presets cover a large-format floor, a subway backsplash, a mosaic sheet, and a 12 by 12 inch floor in imperial units. Waste defaults to 10 percent. A joint wider than about 5 mm usually wants sanded grout; a narrow joint on polished tile often wants unsanded. Epoxy is counted by mass, not by the resin-to-hardener split on the label.
Nothing is uploaded. Empty areas, tiles outside 10 to 1200 mm, joints outside 1 to 20 mm, and waste above 30 percent are rejected. The tile calculator counts pieces and boxes. The caulk calculator sizes a sealant bead. This one only sizes the grout in the joint.
How to use it
- 1Choose metres or feet, then a known area or a rectangle.
- 2Enter tile length and width, joint width, and joint depth.
- 3Pick sanded, unsanded, or epoxy, plus bag size, waste, and an optional price.
- 4Review kilograms per square metre, bags to order, leftover, and cost, then copy the order.
Frequently asked questions
- How much grout do I need?
- Multiply kilograms per square metre by the area, add waste, and divide by the bag size. A 600 mm tile with a 2 mm joint uses about 0.11 kg/m² of sanded grout before waste. A smaller tile uses more because the joint length per square metre is longer.
- What is the formula?
- kg/m² = (tile length + tile width) / (tile length × tile width) × joint width × joint depth × density. Sizes are millimetres. Density is 1.6 for sanded cement, 1.5 for unsanded, and 1.55 for epoxy.
- Sanded or unsanded grout?
- Sanded grout is the usual pick for joints wider than about 5 mm. Unsanded is for narrow joints, often under 3 mm, especially on polished or glass tile. This tool does not choose the product; it only changes the density factor.
- Does the calculation leave the browser?
- No. Areas, tile sizes, prices, and the bag count stay on your device.