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Quick answer

How Many Tiles Do I Need for a Bathroom Floor?

Floor tiles with 3mm grout joints, laid straight, with 10% for cuts and breakages.

Page last reviewed 26 October 2026 by the UkToolCalc team

A 2.5 × 2m bathroom floor (5m²) needs 60 tiles of 300 × 300mm, 31 of 600 × 300mm, or 16 of 600 × 600mm, including 10% for cuts.

Work out your own in the Tile calculator
  • ~11300 × 300 tiles per m²
  • ~5.5600 × 300 tiles per m²
  • +10%for cuts, straight lay
  • ~5m²per 20kg bag of adhesive

Tiles by floor size

3mm joints, straight lay, 10% extra. Adhesive in 20kg bags at a 10mm notch.

Floor area300 × 300mm600 × 300mm600 × 600mmAdhesive
3 m²3619101 bag
4 m²4825131 bag
5 m²6031162 bags
6 m²7237192 bags

The sum

Tiles = floor area × 1.1 ÷ ((tile length + joint) × (tile width + joint)) 5m² of 300mm tiles: 5 × 1.1 ÷ (0.303 × 0.303) = 60

The tile calculator also works out boxes, grout and walls. Uneven floor? Level it first with the self-levelling compound calculator.

Frequently asked questions

How many 300 × 300 tiles are in 1m²?

About 11 with 3mm joints (10.9 exactly). A 600 × 300mm tile is about 5.5 per m², and a 600 × 600mm tile about 2.75 per m².

How much extra tile should I buy?

10% for a straight layout, 15% for diagonal or herringbone, and a few more if the room has lots of corners, pipes or a toilet to cut around. Keep a couple of spares for future repairs.

How much tile adhesive for a bathroom floor?

About 4kg per m² with a 10mm notched trowel, so one 20kg bag covers about 5m² of floor.

Related calculators

Tile CalculatorTiles, boxes, adhesive and grout for floors and walls. Self-Levelling Compound Calculator20kg / 25kg bags, primer, water and edge strip for any floor depth. Laminate & Flooring CalculatorPacks of laminate, LVT or engineered wood, plus underlay and beading.