FREE ONLINE CALCULATOR

Limewash Paint Calculator: Gallons & Coats

Limewash paint coverage changes with the product, substrate and method of application. Make a project estimate using your manufacturer’s stated coverage instead of a generic one-size-fits-all rule.

Configure your estimate

Starting numbers are illustrative only, not verified coverage or current prices. Replace them with measurements and your exact product’s data sheet before buying.

This calculator needs JavaScript. Enable JavaScript to use the interactive estimate; the formulas are explained below.

Tip: a product rate listed per layer and one listed for an entire system are not interchangeable. Use the rate described in each input label.

How to use this calculator

Enter the net wall area and coverage for one US gallon applied as one coat. Then set the intended coat count, extra allowance and container size. The tool estimates liquid usage and rounds the order to whole containers.

The calculation explained

Gallons = measured area × coats × (1 + allowance ÷ 100) ÷ product-rated area covered per gallon per coat. Containers = round up(gallons ÷ gallons per container).

Important: These are planning calculations, not installation instructions, warranty advice or professional specifications. Site and manufacturer requirements take priority. Default input values are examples only.

Check these details before ordering

  • Check if your product data reports a diluted or an undiluted yield.
  • Test coverage on your actual surface, especially if the wall is porous.
  • Keep gallon and litre conversions separate from changes in surface coverage.

Frequently asked questions

How many coats of limewash should I enter?

Use your chosen product’s instructions and desired finish. The two-coat starting value is an example, not a universal recommendation.

Why does this tool ask for square feet per gallon?

Manufacturers publish different coverage rates. Entering your own rated area per gallon is more reliable than relying on a universal default.

Does the calculation include primer?

No. Estimate compatible primer and sealer separately where the manufacturer specifies them.

Read the related guide

For more context, see How to Read Paint and Decorative Plaster Coverage Rates. It explains practical assumptions that a calculator cannot confirm for your individual project.