How do I calculate floor area from a construction plan?

Upload your construction plan (PDF, JPG or PNG) to SiteScope. Our AI detects walls, reads the printed dimensions or scale, and returns the total floor area in square metres along with wall area, ceiling area and openings — usually in under 60 seconds.

How accurate is AI floor plan measurement?

AI measurement is directional and relies on printed dimensions or scale on the plan. It's great for quick quoting and budgeting but is not CAD-grade. SiteScope offers a 5% accuracy refund policy — if our estimate is off by more than 5%, we refund the credit.

Can I use this to estimate paint, tile or drywall coverage?

Yes. SiteScope returns wall area, floor area, ceiling area and perimeters separately, so you can use the right surface for each trade — wall area for painters, floor area for tilers, ceiling area for plasterers.

Is there a free version?

Yes — your first plan is on us. Enter your email on the homepage and we'll add one free credit to your account so you can measure your first plan before paying anything.

Does SiteScope work outside Australia?

Yes. SiteScope works globally with any English-language construction plan. Prices are shown in Australian dollars by default; equivalents in USD, GBP, EUR and other currencies are calculated at checkout.

Paint coverage · litres & cost estimator

Paint Coverage Calculator from House Plans

Pricing a paint job? SiteScope measures the net paintable surface area(walls + ceilings, minus doors and windows) directly from a construction plan. Use the m² to estimate paint litres needed at your spread rate (typically 10–14 m²/L for two coats) — and to quote labour and materials with confidence.

Measured in m² / ft² Branded PDF in 60s ±5% refund policy

Accuracy note: SiteScope provides directional AI estimates based on printed dimensions/scale. Use for fast quoting and budgeting; verify on-site for binding quotes. ±5% accuracy refund policy applies.

How it works

From plan to paintable surface area — in 60 seconds.

01
Upload a floor plan
02
AI returns wall area (net of openings) + ceiling area
03
Multiply total m² by your spread rate to get litres needed
04
Add 5–10% wastage for cutting-in, rollers and touch-ups

Built for

Who uses the paintable surface area calculator?

Painting contractors
Decorators
Property maintenance teams
Real-estate agents preparing listings
Landlords budgeting refurbishments
DIY homeowners

Frequently asked

About paintable surface area.

How do I estimate paint litres from m²?+

Most modern interior paints spread at 10–14 m² per litre per coat. For two coats, divide your total paintable m² by ~6 to get litres. Premium paints (Resene SpaceCote, Dulux Wash&Wear) spread further; cheap paints less.

Should I include the ceiling in paint coverage?+

Only if it's being painted. SiteScope returns walls and ceilings separately so you can include/exclude either depending on the scope.

Are doors and windows subtracted automatically?+

Yes — the wall area returned is already net of opening area.

More calculators

One plan, every measurement you need.

Floor area · square metres & square feet

Floor Area Calculator

Open calculator

Wall area · net of openings

Wall Area Calculator

Open calculator

Ceiling area · m² and ft²

Ceiling Area Calculator

Open calculator

Tile area · m² + wastage included

Tile Area Calculator

Open calculator

Drywall takeoff · m² and sheet count

Drywall & Gyprock Takeoff Calculator

Open calculator

Stop measuring by hand.

Upload your plan now — the first paintable surface area takeoff is on us.