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Paint Thinner Mix Ratio Calculator

Add ratio:1 thinner to a base paint quantity.

Compute how much thinner to add to a paint base for a given thinner-to-paint ratio (commonly 10 % for spray-gun viscosity). Returns the resulting total volume in fluid ounces, quarts, and gallons.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

fl oz
%

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

thinner = paint · (ratio_pct / 100)

In depth

Compute how much thinner to add to a paint base for a given thinner-to-paint ratio (commonly 10 % for spray-gun viscosity). Returns the resulting total volume in fluid ounces, quarts, and gallons.