Wall Putty Calculator
Estimate filler and skim coat quantities for a wall from its area, the coat thickness and how many coats you will apply.
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Formula and method
Net wall area is multiplied by the layer thickness and the number of coats to give a volume, and by the consumption rate to give the mass. The mass is divided by the bag weight and rounded up.
How to measure the inputs
- Measure the wall length and height, then enter how many walls are the same.
- Deduct large openings, but keep the reveals in mind.
- Note the consumption rate and bag weight from the packaging.
Worked example
Wall length 13.12 ft; Wall height 9.84 ft; Wall count 1; Openings area (optional) 3.23 ft²; Layer thickness 0.08 in; Number of coats 2; Consumption rate 2; Package weight 6.61 lb; Waste 10 % → Putty bags: 35
Practical tips
- Sand between coats — it is what makes the final coat look flat under paint.
- Mix only as much as you can apply before it starts to set.
- Check the surface with a light held at a low angle before painting.