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About this tool
Calculate wall putty kilos and bags per square foot, plus mixing water and cost, for a smooth base before painting.
The Wall Putty Quantity Calculator converts a room's wall and ceiling area into kilos of putty, bags to buy and litres of gauging water. It works from the coverage manufacturers actually publish — 20-22 sq ft per kg in two coats for white-cement wall putty, and 30-35 sq ft per kg for ready-mix acrylic putty — then adjusts for gypsum, uneven or rough plaster. Useful for homeowners checking a painter's material list and for contractors pricing a job.
Open Wall Putty Quantity Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Derived from the published two-coat coverage, so the answer reconciles with the pack.
Tells you the gauging water for powder putty at roughly 38% of the putty weight.
Enter length, width and height, or skip straight to a square-foot figure.
Roughly 48 kg for two coats on smooth plaster, since white-cement wall putty is published at 20-22 sq ft per kg in two coats. Ready-mix acrylic putty covers 30-35 sq ft per kg, so the same 1000 sq ft needs about 32 kg.
Two coats is the standard system and is what the published coverage assumes: the first fills and levels, the second is sanded flat. A single coat is only for touching up patches on a wall that is already smooth.
About 38% water by weight for white-cement putty, so roughly 380 ml of clean water per kilo of powder. Mix only what can be applied in about 20 minutes, because the material stiffens as the cement sets and cannot be re-tempered with more water.
Yes. Putty gives a smooth, hard base but it is still absorbent, so a primer coat is what stops the emulsion soaking in unevenly and is what makes the paint's quoted coverage achievable. Skipping primer over fresh putty usually costs more in extra paint than the primer saved.
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