How the plastering quote calculator works
Enter the width and height of each wall, tick whether the ceiling is being plastered, and JobCalc calculates the total paintable surface area automatically. Deductions for doors and windows are handled using standard UK opening sizes, which you can adjust in settings to match your typical job. With the area worked out, JobCalc applies a coverage rate for your chosen plaster — multi-finish, bonding, hardwall, one-coat, board finish or thistle — and converts it into the exact number of 25kg bags you need to buy.
Coverage rates you can trust
Every plaster type has its own coverage, measured in square metres per bag. JobCalc ships with sensible UK defaults, but because products vary between manufacturers, you can override the coverage for each plaster type in settings. That way the calculator always reflects the exact material you spread on site, not a generic average. A wastage percentage is added on top so you order enough without running short mid-job.
Adding labour and building the quote
Once the bags are calculated, enter your cost per bag and your labour rate — by the day, by the hour, or per square metre. JobCalc multiplies it through, adds any extra costs, applies your profit margin and VAT, and produces a clear total. From there you can save the quote, export a professional PDF, send it by email or WhatsApp, or copy the breakdown straight to a customer message.
Built for plasterers on the move
JobCalc is mobile-first, so you can price a re-skim while standing in the customer's hallway. No spreadsheets, no evening admin, no second-guessing the maths. Start your free 30-day trial and turn your next plastering job into a professional quote before you drive home.
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