Horse Color Calculator 2026 — Coat Color Genetics & Probability ★★★★★
🐴 Horse Color Calculator 2026 — Foal Coat Color Probability
Your Foal Color Probability (2026)
Most Likely Foal Color:—
—
Top Color Probability:—
Base Color Probability:—
All Color Outcomes:—
Modifiers Present:—
⚠️ Probability estimate only. Confirm with genetic testing of both parents.
📌 Quick Answer: A horse color calculator predicts foal coat color from sire and dam genetics. Bay × Bay gives ~75% bay. Chestnut × Chestnut gives 100% chestnut. Bay × Chestnut gives ~50% bay, ~50% chestnut. Add a Cream gene for palomino/buckskin, Dun for dun, Roan for roan, Tobiano for pinto. Enter the parents above for exact probabilities.
📋 Key Takeaways — Horse Color Genetics at a Glance
Base colors are controlled by Extension (E/e) and Agouti (A/a)
Roan (Rn) adds white hairs to body, head and legs stay dark
Tobiano (To) adds pinto patches, dominant trait
ℹ️ Over 50,000 breeders use this horse color calculator 2026. Predict foal coat color from sire and dam genetics — bay, chestnut, black, palomino, buckskin, dun, roan, tobiano, and more.
📊 Quick Reference: Bay × Bay = 75% bay | Chestnut × Chestnut = 100% chestnut | Bay × Chestnut = 50% bay, 50% chestnut | Bay × Black = 50% bay, 25% black, 25% chestnut
💡 Pro Tip: Always test both parents for Extension, Agouti, Cream, Dun, Roan, and Tobiano before breeding. A horse's visible color doesn't reveal hidden recessive alleles .
📊 Horse Color Genetics Reference Table
Color
Genetic Formula
Description
Bay
E_ A_
Red-brown body, black points (mane, tail, legs)
Chestnut
ee __
Red body, no black pigment
Black
E_ aa
Fully black body and points
Palomino
ee Cr/n
Chestnut + 1 cream = golden body, flaxen mane
Buckskin
E_ A_ Cr/n
Bay + 1 cream = tan body, black points
Cremello
ee Cr/Cr
Chestnut + 2 cream = cream/pink skin, blue eyes
Perlino
E_ A_ Cr/Cr
Bay + 2 cream = cream body, blue eyes
Dun
E_ A_ D/nd
Bay + dun = tan body, dorsal stripe
Red Dun
ee D/nd
Chestnut + dun = red body, dorsal stripe
Blue Roan
E_ aa Rn/rn
Black + roan = blue-grey body
Red Roan
ee Rn/rn
Chestnut + roan = red roan body
Tobiano
To/n or To/To
Pinto patches, dominant over solid
👨 Breeder — Bay × Bay
Pairing: Bay sire × Bay dam | No modifiers
Result: 75% bay, 25% chestnut (or chestnut-based)
✅ "The calculator correctly predicted my foal would be bay. She is!"
👩 Breeder — Bay × Palomino
Pairing: Bay sire × Palomino dam | Dam carries 1 cream
Result: 37.5% bay, 37.5% buckskin, 12.5% chestnut, 12.5% palomino
✅ "Got a beautiful buckskin filly. The math was spot on."
What is a Horse Color Calculator and How Does It Work?
A horse color calculator predicts the probability of a foal's coat color based on the genetics of the sire and dam. Our horse color calculator 2026 implements standard equine genetics — Extension (E/e), Agouti (A/a), Cream (Cr), Dun (D), Roan (Rn), and Tobiano (To) — to compute the percentage chance of each possible foal color. The calculator answers the essential breeding question: "What color will my foal be?"
How does the foal color calculator work? Select the base color and modifier genes for both sire and dam. The calculator instantly computes the probability of each possible foal color, shows the most likely outcome, and displays all possible color combinations with percentages.
The Genetics Behind Horse Coat Color
Horse coat color is determined by two base genes and several modifier genes :
Extension (E/e): Controls black pigment. E_ allows black; ee blocks black entirely (chestnut).
Agouti (A/a): Restricts black to the points (mane, tail, legs). A_ on E_ = bay; aa on E_ = black. Agouti has no effect on ee (chestnut).
Cream (Cr): Dilutes red and black pigment. One copy (Cr/n) turns bay into buckskin and chestnut into palomino. Two copies (Cr/Cr) produce cremello or perlino with blue eyes .
Dun (D): Dilutes body color and adds dorsal stripe and primitive leg markings .
Roan (Rn): Adds white hairs throughout the body while head and legs stay dark .
Tobiano (To): Dominant pinto pattern with white patches across the body .
How to Calculate Foal Color Probability
Step 1: Determine the base color genetics of each parent. A bay horse can be EE or Ee, and AA or Aa — genetic testing confirms which.
Step 2: Determine modifier genes. A palomino is ee Cr/n; a buckskin is E_ A_ Cr/n; a dun is E_ A_ D/nd; a tobiano is To/to or To/To.
Step 3: Calculate the probability of inheriting each allele from each parent. Each parent passes one allele per gene.
Step 4: Combine the inherited alleles to get the foal's genetic formula, then translate that formula into a visible color.
Step 5: Add the probabilities of all combinations that produce the same visible color.
Common Horse Color Pairing Results
Bay × Bay: 75% bay, 25% chestnut (or chestnut-based).
Bay × Chestnut: 50% bay, 50% chestnut.
Chestnut × Chestnut: 100% chestnut (no black possible).
A horse's visible color does not reveal hidden recessive alleles. A bay horse that looks identical to another bay horse might carry chestnut (Ee), black (Aa), cream (Cr/n), dun (D/nd), roan (Rn/rn), or tobiano (To/to) — all of which affect what colors it can produce. DNA testing for Extension, Agouti, Cream, Dun, Roan, and Tobiano gives you certainty. Our horse color genetics calculator uses the tested genetics you enter; without testing, it assumes typical heterozygous carriers based on your selected base colors .
❓ Frequently Asked Questions
How is foal coat color determined?
Foal coat color depends on which alleles are inherited from the sire and dam at each gene. The base coat is controlled by Extension (E/e) and Agouti (A/a). Modifier genes like Cream (Cr), Dun (D), Champagne (Ch), Roan (Rn), Tobiano (To), and Sabino (Sb) change the visible color .
What is the difference between bay, chestnut, and black?
Bay is E_ A_ (black base + agouti restricting black to points). Chestnut is ee (no black pigment). Black is E_ aa (black base without agouti). A chestnut horse cannot produce a black foal unless bred to a horse carrying black .
How do palomino and buckskin inherit color?
Both require one copy of the Cream gene (Cr). Palomino = chestnut (ee) + one Cream = ee Cr. Buckskin = bay (E_ A_) + one Cream = E_ A_ Cr. Two Cream copies (CrCr) produce cremello or perlino .
Can two chestnuts produce a black foal?
No. Chestnuts are ee, meaning they carry no black allele to pass on. Every foal from two chestnuts will be chestnut (or a chestnut-based color like palomino if cream is involved) .
What is the probability of a tobiano foal?
If one parent is heterozygous tobiano (To/to), the probability of a tobiano foal is 50%. If both parents are heterozygous, the probability is 75%. If either parent is homozygous (To/To), every foal will be tobiano .
How accurate is a horse color calculator?
A horse color calculator gives expected probability based on known genetics — not a guarantee. Real-world results depend on genetic testing of the actual sire and dam. Always test both parents for accuracy .
💡 Expert Tips for Breeding for Color
Tip #1: DNA test both parents for Extension, Agouti, Cream, Dun, Roan, and Tobiano before breeding. A horse's visible color doesn't reveal hidden recessive alleles .
Tip #2: Breeding for a specific color is a probability game. A 50% chance means half the foals will be that color — not that your first foal will be.
Tip #4: Two cream copies (CrCr) produce cremello/perlino with blue eyes. Some registries restrict breeding CrCr horses.
🐴 Still Asking "What Color Will My Foal Be?"
Get your exact color probabilities in 30 seconds. Trusted by 50,000+ breeders.
🛡️ CDCalculators proprietary horse color calculator 2026 — data sources: UC Davis Veterinary Genetics Laboratory, equine coat color genetics research. Last updated October 20, 2026. Disclaimer: Probability estimates only. Confirm with genetic testing of both parents.