What is a Horse Color Calculator and How Does It Work?
A horse color calculator is a genetics tool that predicts what color your foal will be based on the colors of the sire and dam. Our horse color calculator 2026 uses established equine genetics principles from the UC Davis Veterinary Genetics Laboratory to provide accurate probability percentages. Whether you're breeding Quarter Horses, Thoroughbreds, Arabians, or Paints, this foal color predictor helps you plan matings and understand potential coat colors.
How does a horse color genetics calculator work? The calculator applies Punnett square genetics to determine the probability of each possible coat color. It considers the Extension gene (E/e) which controls black vs red pigment, the Agouti gene (A/a) which determines bay vs black, the Cream dilution gene (Cr) which creates palomino and buckskin, the Gray gene (G), and the Dun gene (D).
What Color Will My Foal Be? Common Breeding Combinations
The most common question for horse breeders is "what color will my foal be?" Here are the most frequent breeding combinations and their outcomes:
Bay x Bay: If both parents are bay (E_ A_), the foal has a 75% chance of being bay and 25% chance of being chestnut. If both parents carry the red gene (Ee A_ ), the chestnut probability increases. Our horse coat color calculator accounts for hidden genes.
Chestnut x Chestnut: Two chestnut horses (ee) will produce 100% chestnut foals regardless of other genes. This is because chestnut is recessive — both parents can only pass the e allele.
Palomino x Chestnut: A palomino (ee Crcr) bred to a chestnut (ee) produces 50% palomino and 50% chestnut foals. The cream gene (Cr) is passed 50% of the time.
Buckskin x Bay: A buckskin (E_ A_ Crcr) bred to a bay (E_ A_) produces approximately 50% buckskin and 50% bay. The cream dilution gives the buckskin color.
Gray x Non-Gray: If one parent is gray (G_), there is a 50% chance the foal will be gray. Gray foals are born their base color and gradually turn gray.
Understanding Equine Color Genetics
The Extension Locus (E/e) controls whether a horse can produce black pigment. The dominant E allele allows black pigment, while the recessive e allele restricts pigment to red (chestnut). A horse that is EE or Ee can be bay or black. A horse that is ee will always be chestnut.
The Agouti Locus (A/a) determines where black pigment appears. The dominant A allele restricts black to the points — creating bay. The recessive a allele allows black pigment over the entire body — creating black. A bay horse can be AA or Aa. A black horse is always aa.
Cream Dilution (Cr) creates palomino (chestnut base + one cream), buckskin (bay base + one cream), cremello (chestnut + two cream), perlino (bay + two cream), and smoky cream (black + two cream).
Breed-Specific Color Frequencies
Quarter Horses have high frequency of sorrel/chestnut (over 40%) and bay. Palomino and buckskin are common and highly valued. Thoroughbreds have a limited color palette — primarily bay, chestnut, black, and gray. Cream dilution does not naturally occur in registered Thoroughbreds. Arabians have extremely high gray frequency (over 50%). Bay and chestnut are also common. Paints combine tobiano and overo patterns with various base colors. Draft horses commonly have black, bay, chestnut, and roan.