Tile Calculator: Tiles, Boxes, Adhesive and Grout

Worked example: 12 × 10 ft room with 600 × 600 tiles

This room needs 10 boxes (40 tiles), three 20 kg bags of adhesive and about 2 kg of grout, and budgets at about ₹26,046 at the default rates. Inputs: one 3 ft door, 100 mm skirting, 3 mm saw cut, no dado, 10% tile allowance, four tiles per box, 3 mm joints, 8 mm grout depth, grout factor 1.6 and a 6 mm square-notch trowel.

At the default rates, tiles cost 14.4 ÷ 0.09290304 × ₹90 = ₹13,950.03, adhesive costs 3 × 20 × ₹40 = ₹2,400, and the grout material allowance is ₹533.81. Labour is 120 × ₹35 + 41 × ₹25 = ₹5,225; handling is 120 × ₹3 + 41 × ₹2 = ₹442. Keeping full precision until display gives a direct cost of ₹22,550.83, then 10% overheads/profit and 5% contingency give ₹26,046.21. Rounded displayed line items may differ by ₹0.01 when added.

The skirting calculation uses new tile stock and a simple strip yield; it does not assume floor offcuts are reusable. Corners, exposed edges and a cutting plan can change the purchase. The grout formula treats strips as rectangles; perimeter movement joints need their specified sealant separately.

How to measure rooms, skirting and wall dado

Measure the net tiled surface: floor area, skirting length and dado area, each on its own.

1. Measure finished internal room length and breadth. Split an L-shaped floor into rectangles; turn skirting off for artificial rectangles or deduct shared internal edges so their perimeters are not counted as walls.
2. Subtract only footprints that will actually remain untiled. Use net floor area, not carpet-area paperwork or built-up sale area.
3. For skirting, take the perimeter less all door widths and walls receiving dado or another finish. Enter the chosen height in millimetres; set it to zero when skirting is not required.
4. For dado, total the wall lengths at the same tiled height. Deduct actual opening areas and add reveals separately if required. A 5 × 5 ft bathroom with 7 ft dado and one 3 × 7 ft door has 20 × 7 − 21 = 119 sq ft of dado, plus 25 sq ft of floor. When dado runs on every wall, enter the perimeter less door widths (17 ft here) as walls without skirting.
5. Read the carton dimensions and pieces per box. Pool only the same SKU, shade and batch. Agree the layout, then review the cutting allowance before rounding to boxes.
6. Check substrate level, adhesive product, trowel notch and grout depth. Request separate quotes for screed, waterproofing, demolition, borders and special cuts.

Common ordering and costing mistakes

• Calling every 600 mm tile “2 feet” understates metric tile consumption.
• Applying cutting wastage to adhesive and grout overstates the area being laid. These quantities use net tile faces.
• Rounding each room to boxes before pooling the same tile can leave avoidable spare cartons.
• Charging labour on purchased tile area pays for unused tiles. Use net laid area, and running length for skirting.
• Adding skirting over a wall already measured as dado counts two finishes on the same surface.
• Using a 6 mm trowel as proof of a 6 mm bed confuses notch size with the compressed adhesive layer.
• Assuming a published coverage or wastage percentage guarantees the final order ignores uneven surfaces and the actual cut layout.

For comparing finishes, see marble, granite and wooden flooring costs. For a complete finishes register, use BOQ for interior work. The construction calculator library covers paint, plaster, AAC blocks, bricks, concrete, cement and steel.