Advanced Horse Coat Color Calculator
Ever wondered, "what color will my foal be?" Predict your foal's exact coat color probabilities instantly. Select the genetic makeup of the sire and dam below to generate accurate breeding forecasts.
Predicted Foal Coat Colors
How to Predict Your Future Foal's Coat Color?
Welcome to the most advanced and user-friendly colour calculator for horses on the web. Whether you are a professional breeder planning your next season or an enthusiast curious about equine genetics, our foal color predictor provides instant, accurate mathematical probabilities.
To use the tool, input the genetic makeup of the sire (stallion) and the dam (mare). If you have a DNA panel, select the exact alleles. If you don't have DNA test results, you can estimate the genes based on the horse's visual appearance (phenotype) and previous offspring.
Understanding Advanced Horse Color Genetics
Every horse receives one gene copy (allele) from its sire and one from its dam. The foundation of our horse genetics calculator relies on these interactions:
Base Colors: The Extension and Agouti Genes
- The Extension Gene (E): Controls the production of black pigment. The dominant allele "E" produces black, while the recessive "e" produces red. A horse with "e/e" will be Chestnut.
- The Agouti Gene (A): Determines where black pigment goes. A dominant "A" restricts black to the points (legs, mane, tail), creating a Bay. Recessive "a/a" leaves the black pigment uniform, resulting in a Black horse.
The Dilute Gene Calculator (Cream, Dun & Roan)
Once the base color is established, modifier genes can alter the appearance. Our advanced calculator includes:
- Cream Gene (CR): A single copy (CR/n) dilutes a chestnut to a Palomino, a bay to a Buckskin, and a black to a Smoky Black. Two copies (CR/CR) result in double dilutes: Cremello, Perlino, and Smoky Cream.
- Dun Gene (D): Adds primitive markings (dorsal stripe, zebra striping on legs) and dilutes the body color. A bay becomes a Bay Dun, a black becomes a Grullo, and a chestnut becomes a Red Dun.
- Roan Gene (RN): Causes white hairs to be evenly intermixed with the base coat color, leaving the head and lower legs dark (e.g., Blue Roan, Red Roan).
- Gray Gene (G): If a foal inherits a Gray allele, it will progressively turn white or dapple gray, "masking" its true genetic base color over time.
Interactive Horse Color Chart for Breeding
While our interactive tool calculates complex percentages, here is a quick reference foal color chart showing basic outcomes if parents are homozygous for their respective traits.
| Sire Color | Dam Color | Most Likely Foal Color (Base) |
|---|---|---|
| Chestnut | Chestnut | 100% Chestnut |
| Black (EE, aa) | Chestnut (ee, aa) | 100% Black |
| Bay (EE, AA) | Black (EE, aa) | 100% Bay |
| Palomino (ee, CR/n) | Chestnut (ee) | 50% Palomino / 50% Chestnut |
Frequently Asked Questions (F.A.Q.)
How accurate is a horse colour calculator?
A horse colour calculator is extremely accurate, operating on the established laws of Mendelian genetics. If the exact genetic makeup (genotype) of both the sire and dam is known through DNA testing, the calculator provides the exact mathematical probability of each possible coat color for the foal.
Can two black horses produce a chestnut foal?
Yes, absolutely. Black is dominant over chestnut (red). If both black horses are heterozygous for the Extension gene (meaning they carry one Black 'E' allele and one Red 'e' allele, written as E/e), there is a 25% mathematical probability that they will both pass on the recessive 'e' allele resulting in a chestnut foal.
What is a dilution gene in horse breeding?
A dilution gene in horse breeding lightens the base coat color. The most common is the Cream (CR) gene, which dilutes a chestnut horse to a palomino, and a bay horse to a buckskin. Other dilute genes computed in our advanced calculator include Dun and Roan.