A Punnett Square calculator is an interactive genetics tool that uses Mendelian inheritance principles to predict possible outcomes of genetic crosses or breeding experiments. Named after British geneticist Reginald C. Punnett (1905), the Punnett Square visually represents how traits may be inherited from parents to offspring — helping you calculate genotype and phenotype probabilities at a glance.

With our online Punnett Square generator, you can explore everything from a monohybrid cross calculator for single traits to an advanced dihybrid cross Punnett Square calculator for two traits at once. It’s a great way to understand heredity, dominant and recessive genes, and probability patterns.

Simply enter the parent genotypes (e.g., dominant “A” vs. recessive “a”) into the calculator. The tool automatically builds your Punnett Square, showing every possible genotype ratio and phenotype ratio your offspring could inherit.

Whether you’re a student, teacher, or genetics enthusiast, our free Punnett Square solver makes learning genetics interactive, accurate, and fun. You can also try specialized tools like the genotype ratio calculator, blood type Punnett Square calculator, or dihybrid cross generator for more complex inheritance patterns.

Our goal is to make genetics learning simple, accurate, and accessible with science-based tools you can use anytime — all completely free.

🔬 Accurate Genetic Predictions

Get fast, reliable results for genotypes and phenotypes based on parental alleles. Perfect for students, teachers, and researchers who need accurate inheritance probabilities instantly.

🧬 Covers Multiple Trait Types

From monohybrid and dihybrid crosses to more complex genetic scenarios, our calculator supports multiple inheritance patterns in one place.

⚡ Quick & Easy to Use

No complicated formulas or charts! Simply enter the parent genotypes and click “Calculate” to generate your Punnett Square instantly.

🎓 Free Educational Tool

Completely free to use — ideal for classrooms, science projects, and self-learning about Mendelian genetics. Learn how traits are passed on without cost or sign-up.

FAQs – Punnett Square Calculator

1. What is a Punnett Square and how does this calculator help?

A Punnett Square is a simple yet powerful genetics tool used to predict possible genotypes and phenotypes of offspring from a genetic cross.
Our Punnett Square calculator helps you instantly visualize the inheritance of traits using alleles from both parents. Whether you’re studying monohybrid or dihybrid crosses, it provides quick, accurate results that make genetics easier to understand.

2. How do I enter alleles for a genetic cross?

Simply input the alleles of each parent (for example, AA, Aa, or aa).
The Punnett Square generator automatically builds the grid, showing all possible offspring combinations. You can also use our genotype ratio calculator and phenotype calculator to see probability breakdowns for each outcome.

3. Can this calculator handle multiple traits?

Yes! Our online Punnett Square calculator can perform monohybrid, dihybrid, trihybrid, tetrahybrid, and even pentahybrid crosses, allowing you to explore inheritance patterns for one to five traits at once.
For example, try our dihybrid cross calculator or trihybrid cross Punnett Square calculator to analyze multiple gene interactions.

4. What do genotype and phenotype results mean?

Genotype: The genetic makeup of offspring (e.g., AA, Aa, or aa).
Phenotype: The physical or observable traits (like eye color, hair color, or flower color) resulting from the genotype.
You can use our genotype and phenotype calculator or phenotypic ratio calculator to explore these differences in more detail.

5. What if I don’t know which traits are dominant or recessive?

No worries! The Punnett Square solver assumes standard dominant and recessive inheritance patterns by default.
However, you can customize alleles and dominance rules for more accurate and personalized genetic predictions — especially useful for advanced studies or complex genetic probability calculators.