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Interior Redesign AI
Free · no sign-up · runs in your browser

Free bathroom remodeling tools

5 free bathroom calculators and planners: size the exhaust fan, check toilet, vanity and shower clearances against the IRC and NKBA, and work out shower tile and grout before you shop. Every number is cited.

Updated · By the Interior Redesign AI editorial team · Sources cited on the page

The same bathroom redesigned as a warm spa: sand-colored tile, a wood vanity and a round mirror

Layout and code checks

Clearances, shower size and ventilation, checked against the IRC and NKBA.

Bathroom Exhaust Fan CFM CalculatorFan CFM from floor area or fixtures (HVI), with the IRC duct length check.Free, no sign-upBathroom Vanity Size PlannerWidest standard vanity for the wall, sink count and IRC vs NKBA clearances.Free, no sign-upShower Size Code CheckerShower and tub layout checked against IRC P2708.1, R307.1 and NKBA.Free, no sign-up

Tile and materials

How much tile and grout to buy, with waste.

Shower Tile CalculatorShower walls, niche returns and floor in sq ft, with tiles and boxes to order.Free, no sign-upGrout CalculatorPounds and bags of sanded grout from the maker's coverage chart.Free, no sign-up

How we calculate

Each tool does plain, visible arithmetic in your browser, with no AI and no server call, and shows its formula, a worked example and its sources on the page. Code figures cite the model code section, quantities cite the manufacturer's published spec, and prices cite a named cost guide with the date we checked it.

Where we had to assume something, the page says so and the widget lets you change it. Results are planning numbers, not quotes or code rulings.

More tools for this project

Then see it on your bathroom

The same photo, before and after an AI render. Your walls, windows and layout stay; the finishes change.

The original bathroom before the redesign: pink wall tile, an oak vanity and a framed glass shower
Before
The same bathroom redesigned as a warm spa: sand-colored tile, a wood vanity and a round mirror
After: Warm spa (AI illustration)

Questions

Are these bathroom tools free?

Yes. Every calculator runs in your browser, costs nothing and needs no account. Only the AI redesign of your own bathroom photo needs a free account.

Where do the code numbers come from?

Clearances and shower minimums come from the 2021 International Residential Code (R307.1 and P2708.1) and the NKBA Bathroom Planning Guidelines; fan sizing from the Home Ventilating Institute and IRC M1505. Each page links its sources.

Do the code checks replace an inspector?

No. They apply the model code as planning checks. Your jurisdiction's adopted code, local amendments and your inspector decide what is required.