Last checked
May 12, 2026
We checked the page logic, support notes, and related links on this page.
Project Hub
Paint Estimating
Estimate paint quantities, tin mixes, and rough material cost for walls, ceilings, and single surfaces.
Decorating3 calculatorsGuides and quote prep included
How to use it
Planning before buying
Use this project hub for a planning check, then confirm the final order or quote against live product data and site conditions.
Why trust it
See how the site is maintained
Read the calculator methodology and editorial policy for the standards behind these pages.
Start here
Start with the calculator that best matches the main material or buying format for the job.
Paint Calculator
Estimate paint quantities, tin mixes, and rough material cost for walls, ceilings, and single surfaces.
Ceiling Paint Calculator
Estimate ceiling paint quantity, litres, and rough cost from room size and coverage rate.
Exterior Paint Calculator
Estimate exterior masonry or timber paint quantities and rough cost from wall area and coverage.
How to use this project hub
Start with the calculator that matches the material or buying format you actually need, then move into the related guides if you need more detail before buying or requesting quotes.
What affects estimates most
Dimensions, depth or coverage assumptions, waste allowance, and pack or stock-length rounding are usually the biggest drivers of the final buying number.
Why the linked guides matter
The extra guides in each hub explain common mistakes, trade-offs, and buying choices that a simple quantity figure cannot cover on its own.
Popular question pages
Use these pages for faster answers when you already know the basic dimensions of the job.
How Much Paint Do I Need for a Room?
Estimate room paint quantities with wall dimensions, coats, and waste explained clearly.
Paint Calculator by Wall Dimensions
Use wall dimensions to estimate paint for single rooms and straightforward repaint jobs.
Ceiling Paint Calculator by Area
Work out how much Ceiling Paint you need from the measured area and a realistic waste allowance.
Ceiling Paint Buying Guide
Work out a sensible buying quantity for Ceiling Paint before you order.
Exterior Paint Calculator by Area
Work out how much Exterior Paint you need from the measured area and a realistic waste allowance.
Exterior Paint Buying Guide
Work out a sensible buying quantity for Exterior Paint before you order.
Guides and next steps
These guides help explain waste, product choice, and buying format once the first estimate is clear.
Paint Coverage Explained
Learn how paint coverage changes with surface type, coats, and product choice.
Paint Waste Allowance Guide
See when to use a low, medium, or higher paint waste allowance.
Use this project hub to brief suppliers or installers
Work through the core calculator first, then use the linked guides and quote checklist to request cleaner, more comparable prices.
- Confirm what the quote should include: materials only, labour only, or both.
- State access, finish level, timing, and any unknowns clearly.
- Ask each supplier or installer to price the same scope and exclusions.
You can also open the wider Paint Estimating project hub if the quote depends on more than one material.