Skip to content

Bathroom Tile Calculator

Quick answer: measure the floor, then each wall, then the shower alcove as three separate sections. Add them together, subtract the door, divide by the area of one tile and add 10–15% waste. The calculator below opens pre-set for a bathroom floor at 12×12 in and merges every section into one tile, box, grout and cost total.

Tile Calculator

Estimate tiles for any room, instantly.

Pick your units, enter your space, choose a tile. Everything updates live — no buttons, no waiting.

What are you tiling?
Units
Area to cover
Tile size
Layout pattern

Diagonal & herringbone add cutting waste automatically.

mm
%
Add box size & price

Used to estimate boxes needed.

Adhesive trowel

Bigger tiles usually need a deeper notched trowel.

Your Estimate

Live

Tiles needed

—

0 boxes · covers 0 sq ft

Total area

—

With waste

—

Grout

—

Adhesive

—

Share:WhatsAppTwitterFacebook

How it works

How to Calculate Bathroom Tile

  1. Enter each surface on its own line

    Floor, the four walls and the shower alcove each get their own line, which keeps the pan steeper waste and the dry floor flatter waste from averaging each other out.

  2. Set tile sizes, gap and waste

    Floors and walls usually take different tiles, so set each one. Give wet areas 15 to 20% waste and dry walls 10 to 15%, then set the grout gap in millimetres.

  3. Read tiles, boxes, grout and cost

    Results update live: tile and box counts per surface, grout and adhesive in kilograms, and a cost total once you enter a price per box.

Calculate bathroom tile in square feet, surface by surface

A bathroom is never one rectangle. Work in square feet per surface: a 5×8 ft floor is 40 sq ft, the long walls are 5 ft wide each and the short walls 8 ft, all at ceiling height. Enter each as its own line so you can see where the money goes — the floor and the shower surround usually cost more than the visible walls because of the cuts.

Walls, floor and shower alcove run separately

The bathroom wall is not the same job as the floor: different tile, different grout gap, different waste. Add one wall section per wall, a floor section, and a separate shower alcove if the tile changes there. The calculator sums all of them into a single order while keeping each surface’s waste rule intact — that is how you avoid buying floor waste on a wall run that needed none.

Deduct only the big openings

Subtract the door and any window over about 10 sq ft. Leave the rest in: outlets, switches, the toilet flange, the vanity pedestal and the shower valve each eat a cut tile, so removing them from the count double-charges you for the cuts around them. The openings panel handles the two that genuinely save tile.

Wet-area rules: slope, grip and grout

The shower floor needs a fall of about 1/4 in per foot to the drain, which means every tile in the pan is a wedge. Use 2×2 in or mosaic there, and expect 20% waste instead of 10%. Wet floors also want more grout lines for grip, so the grout estimate rises too. For a floor-only project, open thefloor tile calculatorinstead and start from the room presets.

FAQ

Bathroom tile questions, answered.

How do I calculate tiles for a whole bathroom?
Work surface by surface: floor first, then each wall, then the shower alcove. Add them as separate sections in the calculator, deduct the door and any window over about 10 sq ft, and everything merges into one tile, box, grout and cost total. A typical 5×8 ft full bath is 40 sq ft of floor plus 88–120 sq ft of wall before deductions.
What size tile should I use on a bathroom floor?
Small bathrooms look larger with 12×12 in or 12×24 in tiles and fewer grout lines. Wet zones and shower floors need smaller tiles — 2×2 in to 6×6 in — because the slope to the drain needs more cut angles and more grout for grip. The calculator opens pre-set to 12×12 in; switch the tile size for the shower floor section only.
How much waste should I add for a bathroom?
10% for a rectangular floor and straight-laid walls, 15% for subway or diagonal patterns, and 20% if the shower has a bench, niche or hexagon floor. Bathrooms produce more cuts per square foot than any other room, so guessing low is the most common ordering mistake.
Do I need a different tile for the shower floor?
Usually yes. The shower floor needs a slope, so it is cut into wedges, and it needs grip when wet. Keep the wall tile for the walls, use a small mosaic or 2×2 in tile for the pan, and run it as its own section so the waste is calculated on the harder cuts separately.
How much does a bathroom tile cost calculator return?
Enter tiles per box and the price per box in the cost panel and the calculator multiplies boxes by price for the whole room. As a rule of thumb tile itself is usually about half the installed cost — grout, adhesive, trim and labour are the rest — so treat the number as a material budget rather than a quote.
Do I need a separate bathroom floor tile calculator?
No. The bathroom floor is still a floor, so this tool handles it with the surface set to floor. If you want the floor and none of the walls, the dedicated floor tile calculator opens with room presets, undercut-door guidance and large-format waste rules already loaded.

Only one surface to do? Try themain tile calculator, the floor tile calculator, the wall tile calculator, or the shower tile calculator.