50 Specialist Calculators
Instant Results - No Sign-Up
Free to Use
Professional tools for serious builders

Replastering a room is one of the most common renovation jobs in the UK - whether you're dealing with blown plaster, damp repairs, or simply refreshing a tired finish before decorating. Getting the materials right first time saves multiple trips to the merchant and avoids costly over-ordering. This project kit walks you through every stage of the job in the correct order, from scratch coat plaster and plasterboard patching through to paint coverage and skirting board lengths.

Enter your room dimensions once and each calculator in the checklist opens pre-loaded with your measurements. Work through each step at your own pace - your progress is saved automatically so you can pick up where you left off. Suitable for rooms of any size, with separate allowances for doors, windows and ceiling area.

What this template covers

Work through these 5 calculators in order. Each one uses your room dimensions to pre-fill the key inputs - just refine the details and save each result to your project.

1
Render & Plaster
Calculate bags of scratch coat and finish plaster for your wall area. Choose your system (hardwall, bonding, multi-finish) and the calculator works out the bags needed with waste.
Open calculator
2
Plasterboard (if patching or dry-lining)
If any walls or the ceiling need plasterboard before skimming, calculate the number of boards, screws, jointing tape and compound required.
Open calculator
3
Interior Paint
Work out how many litres of mist coat, emulsion and ceiling paint you need. Enter your wall and ceiling areas and the calculator covers coats and coverage rate.
Open calculator
4
Skirting Board & Architrave
Calculate the linear metres of skirting board and door architrave needed for the room perimeter, accounting for door and window openings.
Open calculator
5
Adhesive & Bonding Agent
PVA bonding agent, plasterboard adhesive dabs or grab adhesive for skirting. Calculate coverage and quantities needed for your total wall area.
Open calculator

Start this project

Enter your room dimensions and we'll create a project with pre-filled starting points for each calculator.

Measure each wall separately for best accuracy.

Saves to My Projects. Free accounts get 1 project - go Pro for unlimited.

No free project slots

Your free account is limited to 1 saved project. To start this template you can delete an existing project to free up a slot, or upgrade to Pro for unlimited projects.

Delete this project? This cannot be undone.