🧱 Plaster Calculator
Plastering is one of the most skilled DIY jobs, and getting the material quantity right is essential for a smooth finish. Buy too little, and you'll be rushing to the builders' merchant while your mix dries. Buy too much, and you've wasted money on material that can't be returned. Our Plaster Calculator helps you order exactly what you need.
Our calculator factors in wall area, coverage per bag (typically 2.0-3.5 m² per 25kg bag), and the number of coats you're planning. We also include a 10% wastage allowance for spills and wastage, so you always have enough to finish the job.
What our plaster calculator does:
- 📐 Wall Area — Enter length and height to get total wall area in square metres.
- 📦 Coverage per Bag — Choose from 2.0 to 3.5 m² per 25kg bag.
- 🎨 Number of Coats — Choose 1, 2, or 3 coats based on your finish.
- 📊 Wastage Allowance — 10% added for spills and wastage.
💡 Pro Tip: For best results, apply plaster in two coats — a scratch coat and a finish coat. Allow each coat to dry fully before applying the next. Always mix your plaster in small batches — it starts to set within 30-40 minutes!