Paint Color Mixing Calculator

The Paint Color Mixing Calculator solves the question every painter eventually asks: "How much of each paint do I need to mix this exact shade?" Instead of guessing, you pick a target color and tick the base paints you own, and the tool computes the proportions — as a clean ratio, as percentages, and as real volumes — that blend closest to your target. It previews the predicted mix next to your goal and scores the match with a Delta-E value so you know how good the recipe is before you open a single tube.

How the Calculator Finds Your Recipe

This is the reverse of normal mixing. Most calculators take your ratios and show the result; this one starts from the result you want and works backward to the ratios. It treats every mixed color as a proportion-weighted average of the base paints and then searches for the set of non-negative proportions whose blend sits closest to your target color.

Here \(C_i\) is each base paint's color and \(w_i\) is its share of the mix. Because the shares must be non-negative and add up to 100%, the search is a constrained least-squares problem. The calculator solves it with the Frank-Wolfe optimizer, which always keeps the proportions valid — exactly the constraints a real paint recipe has to obey.

Delta-E measures the perceived distance between the predicted blend and your target in CIE Lab color space. The smaller it is, the closer the colors look to the human eye.

Reading the Delta-E Score

Common Color Mixes

These classic results follow naturally from the model — especially tints (with white) and shades (with black), which are the most common real-world adjustments.

Why Some Targets Can't Be Matched Exactly

Mixing only ever moves inside the range spanned by your base paints. You can never mix a color that is brighter, lighter, or more saturated than every paint you started with. If the match is poor, you have three easy fixes:

• Add white to reach lighter, pastel targets.
• Add black (or burnt umber) to reach deeper, darker targets.
• Add a more saturated base paint in the hue you're chasing to extend your reachable gamut.

About the Mixing Model

Real pigments mix subtractively — the result depends on the full light spectrum each pigment reflects, which three RGB numbers cannot fully capture. This calculator uses an idealized linear mixing model that is accurate for the most common tasks: lightening with white, darkening with black, muting colors, and blending neighboring hues. For trickier pigment behavior (the textbook example is blue plus yellow making green), treat the recipe as a strong, measured starting point and adjust the final touches by eye. The value of the tool is getting you 90% of the way there with precise, repeatable proportions instead of trial and error.

Tips for Accurate Mixing

How to Use This Calculator

1. Pick your target color: Use the color picker or type a hex code for the shade you want to mix.
2. Select your base paints: Tick the base paints you actually own — the more relevant ones you include, the closer the match.
3. Enter the total amount: Set how much paint you want to make and choose a unit (ml, fl oz, g, or drops).
4. Click Calculate: The optimizer finds the proportions that blend closest to your target.
5. Mix and check: Follow the ratio, compare the predicted blend to your target, read the Delta-E score, and fine-tune by eye if needed.

Frequently Asked Questions

How does the paint color mixing calculator work?

You choose a target color and tick the base paints you own. The calculator treats the mixed color as the proportion-weighted average of your base paints and runs a least-squares optimizer to find the non-negative proportions whose blend lands closest to your target. It then reports those proportions as a ratio, as percentages, and as real volumes.

What is Delta-E and what is a good value?

Delta-E is the perceived distance between two colors. A Delta-E under about 1 to 2 is essentially invisible to the human eye, 2 to 10 is a close match suitable for most work, and values above 20 mean the target is outside the range your selected base paints can mix. Lower is better.

Why can't my base paints reach every color?

Mixing can only produce colors inside the range spanned by your base paints. You can never mix a color more vivid or lighter than the paints you start with. If the match is poor, add a more saturated base paint, a white for lightness, or a black for depth, then recalculate.

Does blue and yellow make green in this tool?

Real pigments mix subtractively, which depends on their full light spectrum and cannot be captured exactly by three RGB values. This calculator uses an idealized linear mixing model that is accurate for the most common tasks such as lightening with white, darkening with black, muting, and blending neighboring hues. For tricky pigment behavior like blue plus yellow, treat the result as a strong starting point and adjust by eye.

What do parts and percentages mean in the recipe?

Percentages are the exact share of each base paint in the final blend. Parts are those percentages simplified to small whole numbers so you can scoop them out easily, for example 3 parts white to 1 part red. Multiply each percentage by your total amount to get the volume to pour.

Can I use this for acrylic, oil, watercolor, or house paint?

Yes. The ratios apply to any opaque or semi-opaque paint as long as you keep within one paint type and mix by the same measure (all by volume or all by weight). Tinting strength varies between brands and pigments, so use the recipe as a precise starting point and adjust in small steps.

Additional Resources

• Color Mixing - Wikipedia
• Color Difference (Delta-E) - Wikipedia