Paint Color Mixing Ratios Calculator

Paint color mixing combines two or more colors in specific ratios to achieve a desired intermediate shade, tint, or hue. Understanding the math behind mixing prevents wasted paint and costly color mismatches.

Core principle: Color mixing ratios express how many “parts” of each color combine in the final mix. A 3:1 ratio means 3 parts Color A for every 1 part Color B, so 4 parts in total.

Formula for calculating volumes: Color A Amount = Total Volume × (A parts ÷ Total parts) Color B Amount = Total Volume × (B parts ÷ Total parts)

Common mixing ratios and their effects:

Worked example: You need 1 gallon (128 fluid ounces) of a medium green, mixing white and deep green at a 3:1 ratio. White = 128 × (3/4) = 96 fl oz (¾ gallon) Green = 128 × (1/4) = 32 fl oz (¼ gallon) Result: 128 fl oz of mixed paint

The ratio does not care what you measure in, so the calculator lets you pick the unit. Set the shade to 25%, the total to 128, and the unit to fluid ounces and you get exactly the split above. Change the total to 4 and the unit to cups and it is still 3:1, just a craft-sized batch.

Critical rules for successful color mixing:

1. Add dark to light, never light to dark, darker colors overwhelm fast; go slowly
2. Mix more than you need: matching an exact custom color later is nearly impossible
3. Test on a swatch and let dry: wet paint is always 10–15% lighter than dry paint
4. Use the same paint brand and finish: mixing sheens (matte + gloss) produces unpredictable results
5. Record your ratio precisely: write down the exact amounts used before you start

Paint color theory: Yellow + Blue = Green; Red + Blue = Purple; Red + Yellow = Orange. Adding white creates a tint; adding black creates a shade; adding gray creates a tone.