TOOL 07 / FREE · NO SIGNUP
Single-room Project Lite
Measure one room once. Reuse the same geometry for paint, flooring and tile, without an account.
Worked example loaded. These are example measurements and product assumptions.
THE METHOD
How to use this estimate
- Start with length, width, height, and optional doors and windows. Your room geometry is the single source for all three material estimates.
- Choose flooring or tile for the shopping list. Comparing both shows alternatives, not a combined order.
- Your measurements are saved in this browser. Copy and print include the same computed numbers. Sharing puts dimensions and assumptions in the URL fragment; anyone with the link can read them.
- Optional drywall uses the same room openings with its own ceiling, layer and panel assumptions. Panel coverage is pooled before the final sheet count.
one room geometry → net wall paint + floor coverage → each material’s final package rounding
A worked example
The “Load worked example” button uses the same inputs as this example. Explicit unit suffixes keep their meaning in either unit system.
- Project type
- One rectangular room
- Length
- 12 ft
- Width / perpendicular height
- 15 ft
- Room height
- 9 ft
- Doors
- 1
- Door width
- 3 ft
- Door height
- 7 ft
- Windows
- 2
- Window width
- 4 ft
- Window height
- 5 ft
- Paint coats
- 2
- Paint coverage
- 8.589835361488905
- Paint container size
- 1 gal
- Waste allowance
- 10
- Flooring coverage per box
- 20 ft2
- Tile length
- 12 in
- Tile width
- 18 in
- Grout joint
- 0
- Tiles per box
- 12
- Shopping list floor material
- Flooring
- Net wall area
- 39.484 m² / 425 ft²
- Paint needed
- 9.193 l / 2.429 US gal
- Flooring with allowance
- 18.395 m² / 198 ft²
- Tiles with allowance
- 132
Questions, answered
Do I need to sign up?
No. Your project is stored locally in your browser, and you can delete it with Clear saved data.
Does sharing send a project name or address?
No names, addresses or notes are collected. The shared fragment contains dimensions, selected units and product assumptions.
Can I open individual calculators?
Yes. The paint, flooring and tile links carry the same measurements and assumptions.
Can I include drywall?
Yes. Turn on the drywall shopping option and check its separate layer, ceiling, panel and allowance values.
Sources and product assumptions
These references explain units or product specifications. Your selected product label takes priority; none of these sources endorses this calculator.
- NIST SI conversions — room geometry and pooling are our stated model ↗
- NIST US liquid gallon definition — 231 cubic inches ↗
- BEHR MARQUEE No. 1450 — paint coverage, coats and primer context (PDF) ↗
- Daltile Porcealto — actual tile sizes and pieces per carton (PDF) ↗
- Shaw Prime Plank 0616V — product-specific coverage per carton ↗
- Floorify — product and layout-dependent cutting allowance ↗
Source check: 4 October 2026. Worked examples use stated, editable assumptions.