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May 12, 2026
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Project Hub
Decorating Estimating
Decorating estimates change depending on whether you are buying paint, wallpaper, or primer. Start with the finish layer that matches the job, then use the related pages to check waste, coverage, and how many tins or rolls you are likely to need.
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.
Pick the finish you are actually buying
Decorating estimates change depending on whether you are buying paint, wallpaper, or primer. Start with the finish layer that matches the job, then use the related pages to check waste, coverage, and how many tins or rolls you are likely to need.
Primer Calculator
Estimate primer quantities and rough cost for walls, ceilings, timber, and prep coats.
Wallpaper Calculator
Estimate wallpaper rolls and rough cost for wall coverage.
More calculators in this hub
Use these related pages when the same project includes extra materials, linked layers, or a different buying format.
Filler Calculator
Estimate wall filler tubs or bags and rough cost from the area being repaired or skimmed over.
What changes these estimates most
Coat count, surface texture, repeat patterns, and how much cut-in or trimming the job involves are the biggest reasons decorating orders change.
When a quick estimate is enough
A straightforward repaint or simple wallpaper layout can usually be planned quickly, but textured walls and pattern matching need more caution.
Before you order
Check product spread rates, roll yield, surface prep needs, and whether primer or sealer coats need to be bought separately from the finish coat.
Popular decorating questions
These pages are useful when you already know the walls, ceilings, or surface area and want a quick buying number.
Wallpaper Calculator by Area
Work out how much Wallpaper you need from the measured area and a realistic waste allowance.
Wallpaper Buying Guide
Work out a sensible buying quantity for Wallpaper before you order.
How Many Wallpaper Rolls Do I Need?
Estimate wallpaper rolls for a room with repeat, trimming, and spare-roll logic in mind.
Primer Calculator by Area
Work out how much Primer you need from the measured area and a realistic waste allowance.
Primer Buying Guide
Work out a sensible buying quantity for Primer before you order.
Primer Calculator for New Plaster
Estimate primer or mist-coat quantities for new plaster before painting starts.
Filler Calculator by Area
Work out how much Filler you need from the measured area and a realistic waste allowance.
Filler Buying Guide
Work out a sensible buying quantity for Filler before you order.
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 Decorating Estimating project hub if the quote depends on more than one material.