Plaster Calculator
Cement and sand for wall/ceiling plaster by area, thickness and mix.
Thumb: 12 mm internal plaster ≈ 0.09 bag/m². Brick walls drink water — cure plaster 7 days or watch hairline 'crazing' map-crack the paint later.
Formula
Plaster Calculator is a free plaster 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 Plaster Calculator
Cement and sand for wall/ceiling plaster by area, thickness and mix. The calculation implements V = A×t×1.20 (undulation) ×1.33 dry; split 1:n (IS 1661; CPWD norms). Thumb: 12 mm internal plaster ≈ 0.09 bag/m². Brick walls drink water — cure plaster 7 days or watch hairline 'crazing' map-crack the paint later.
How to use Plaster Calculator
- 1Enter Plaster area in m².
- 2Enter Thickness in mm (Internal 12 · external 15–20 (two coats) · ceiling 6–10).
- 3Enter Mix (1 : n sand).
- 4Read Cement bags, Sand instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Plaster Calculator?
- ✓Implements the standard formula — V = A×t×1.20 (undulation) ×1.33 dry; split 1:n
- ✓Reference cited on-page: IS 1661; CPWD norms
- ✓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 Plaster Calculator use?+
It computes V = A×t×1.20 (undulation) ×1.33 dry; split 1:n, per IS 1661; CPWD norms. 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?+
Thumb: 12 mm internal plaster ≈ 0.09 bag/m². Brick walls drink water — cure plaster 7 days or watch hairline 'crazing' map-crack the paint later.
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 Plaster Calculator 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.
Related Engineering tools
Reynolds Number Calculator
Compute Re from density, velocity, pipe diameter and viscosity — with instant laminar/turbulent classification.
● LiveLaminar vs Turbulent Flow Classifier
Classify hydraulic-oil or process-fluid flow regime from kinematic viscosity, line velocity and tube bore.
● LiveBernoulli Equation Solver
Solve downstream pressure between two points from velocities, elevations and fluid density (ideal, lossless).
● Live