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Bathroom Remodel Calculator

Work out what a bathroom remodel will cost — line by line, with a contingency and tax, and the cost per square foot when you add the area.

Bathrooms are small, expensive, and full of hidden work. This calculator lists every line — fixtures to waterproofing — so the total is the real total, not a surprise.

All prices are entered by you. This site publishes no construction prices, and results are estimates, not guaranteed quotes.

Toilet, taps, fittings.
Wall and floor tiling, including labour for tiling if quoted together.
Moving pipes, new connections.
Lighting, outlets, heated floors.
Vanity unit and basin.
Shower, tub, screen or enclosure.
Your labour quote.
Permits, disposal, finishing touches.
10–20% is normal for bathrooms.
Your local sales tax or VAT rate.
Enter the area to get a cost per square foot / metre.

Formula

subtotal = fixtures + tiling + plumbing + electrical + vanity + shower/tub + labour + other contingency = subtotal × contingency% ÷ 100 tax = (subtotal + contingency) × tax% ÷ 100 total = subtotal + contingency + tax cost per ft² = total ÷ bathroom area (when given) All costs are user-entered. This site publishes no prices.

All lengths are converted to a single unit before the calculation: 1 ft = 0.3048 m, 1 in = 25.4 mm, 1 ft² = 0.09290304 m², 1 yd² = 9 ft². Material quantities are rounded up — you cannot buy part of a tile, plank or bag.

How to use this calculator

  1. Enter your cost for each line item (0 if not included).
  2. Set a contingency — 10–20% is normal.
  3. Enter your local tax rate.
  4. Add the bathroom area if you want a cost per square foot.

Worked example

Line itemsFixtures $2,500 + Tiling $3,000 + Plumbing $2,000 + Electrical $1,000 + Vanity $1,200 + Shower $2,500 + Labour $5,000 + Other $800
Subtotal$18,000
Contingency (10%)$1,800
Tax (8%)($18,000 + $1,800) × 0.08 = $1,584
Total$21,384

Check it by hand: every step above uses the formula in the box. If your numbers match the example inputs but the calculator gives a different answer, please report it via the contact page.

Frequently asked questions

What is the biggest cost in a bathroom remodel?

Usually labour and tiling, followed by the shower or tub. Bathrooms are small but dense — plumbing, waterproofing and tiling all cost more per square foot than other rooms.

Do I need a contingency for a bathroom?

Yes — 10–20%. Bathrooms hide the worst surprises: leaks, rot, old plumbing. Opening a wall often finds work nobody quoted for.

Is waterproofing included?

It should be — in the tiling or labour line. If your quote does not mention waterproofing (tanking), ask: a bathroom without it will leak.

Are these figures a quote?

No. They are estimates built from your own numbers — not guaranteed quotes. Get written quotes from contractors for the real price.

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Estimates only. Results are for planning. Measure twice, confirm box coverage and tile sizes on the packaging you buy, and follow the manufacturer's instructions. See the disclaimer.