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.

Wall area · net of openings

Wall Area Calculator for Painters, Plasterers & Drywallers

Painting, plastering, drywalling or wallpapering? Calculate the exact wall area you'll cover — net of doors and windows — straight from a construction plan. SiteScope's AI uses a configurable ceiling height (default 2.7 m) to convert wall lineal metres into coverage area, then subtracts openings so you quote real surface, not gross.

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 wall area — in 60 seconds.

01
Upload your floor plan (PDF/PNG/JPG)
02
Confirm or override the ceiling height (default 2.7 m)
03
AI multiplies wall perimeters × height, subtracts door & window openings
04
Net wall area returned in m², ready to multiply by your $/m² rate

Built for

Who uses the wall area calculator?

Painters & decorators
Plasterers
Drywall / gyprock installers
Wallpaper hangers
Render contractors
Acoustic-panel installers

Frequently asked

About wall area.

How do you calculate wall area from a floor plan?+

Wall area = (total wall perimeter × ceiling height) − openings (doors + windows). SiteScope automates this from your plan — you only need to confirm the ceiling height if it's not the default 2.7 m.

Does it count both sides of internal walls?+

By default, SiteScope returns single-sided wall area, which is what painters typically quote. For double-sided (e.g. plastering both faces), multiply by 2 or contact us — we're shipping a per-trade toggle soon.

How accurate is it for paint quoting?+

Directional. Use it to scope a job in minutes; verify on-site before locking in a quote. ±5% refund policy applies.

More calculators

One plan, every measurement you need.

Floor area · square metres & square feet

Floor Area Calculator

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Ceiling area · m² and ft²

Ceiling Area Calculator

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Paint coverage · litres & cost estimator

Paint Coverage Calculator

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Tile area · m² + wastage included

Tile Area Calculator

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Drywall takeoff · m² and sheet count

Drywall & Gyprock Takeoff Calculator

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Stop measuring by hand.

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