Primer Calculator (Walls & New Drywall)
Litres of primer/sealer for new drywall, patches or colour changes — one coat at primer spreading rates.
Never topcoat bare joint compound — the patches flash through two coats of paint. PVA primer for new drywall, stain-blocking (shellac/oil) over water marks and tannin woods.
Formula
Primer Calculator (Walls & New Drywall) is a free primer calculator for civil engineers, contractors and quantity surveyors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Primer Calculator (Walls & New Drywall)
Litres of primer/sealer for new drywall, patches or colour changes — one coat at primer spreading rates. The calculation implements litres = area ÷ coverage (1 coat) (PDCA / manufacturer primer spreading rates). Never topcoat bare joint compound — the patches flash through two coats of paint. PVA primer for new drywall, stain-blocking (shellac/oil) over water marks and tannin woods.
How to use Primer Calculator (Walls & New Drywall)
- 1Enter Surface area in m².
- 2Enter Coverage per litre in m²/L (New drywall soaks: 8–9 · sealed surfaces 11–12).
- 3Read Primer needed, US gallons instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Primer Calculator (Walls & New Drywall)?
- ✓Implements the standard formula — litres = area ÷ coverage (1 coat)
- ✓Reference cited on-page: PDCA / manufacturer primer spreading rates
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Primer Calculator (Walls & New Drywall) use?+
It computes litres = area ÷ coverage (1 coat), per PDCA / manufacturer primer spreading rates. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
Never topcoat bare joint compound — the patches flash through two coats of paint. PVA primer for new drywall, stain-blocking (shellac/oil) over water marks and tannin woods.
Does it include wastage?+
Yes — standard wastage/bulking factors are built in and stated in the formula line, so the quantity is an orderable number, not a bare geometric volume.
Is the Primer Calculator (Walls & New Drywall) free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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