Height Predictor Calculator

Pediatric Endocrinology & The Tanner Mid-Parental Formula

Genetics account for approximately $80\%$ of adult height variation. Pediatricians utilize the Tanner Mid-Parental Method to establish a child's genetic target height:

• Tanner Formula for Boys:

$$\text{Target Height (in)} = \frac{\text{Father's Height (in)} + \text{Mother's Height (in)} + 5.0}{2}$$

$$\text{Target Height (cm)} = \frac{\text{Father's (cm)} + \text{Mother's (cm)} + 13.0}{2}$$

• Tanner Formula for Girls:

$$\text{Target Height (in)} = \frac{\text{Father's Height (in)} - 5.0 + \text{Mother's Height (in)}}{2}$$

$$\text{Target Height (cm)} = \frac{\text{Father's (cm)} - 13.0 + \text{Mother's (cm)}}{2}$$

• Target Confidence Interval: Human polygenic inheritance yields a natural Gaussian distribution of $\pm 2.0\text{ to } 2.1\text{ inches}$ (${\pm 5.0\text{ to } 5.3\text{ cm}}$) around the mid-parental mean.

How to Use This Calculator

Enter Unit System, Child's Biological Sex, Mother's Height (Total Inches or cm), Father's Height (Total Inches or cm) into the input fields and the calculator will instantly compute Predicted Adult Height (Ft & In), Predicted Adult Height (Metric). All calculations happen in real time — no submission or page reload required. You can adjust any input value and see the result update immediately.

Understanding Your Result

The Height Predictor result gives you a precise, calculated value based on the inputs you provide. Compare your result against published benchmarks from WHO, CDC, and NIH to assess where you stand. A single calculation is a useful starting point, but tracking this metric over time — as inputs change — gives you a much more complete picture.

Practical Application

The Height Predictor is most useful when you have specific, real-world data to enter. For example: enter your actual Unit System to calculate your predicted adult height (ft & in). The result helps health-conscious individuals, patients, and caregivers make informed decisions about tracking health metrics and understanding clinical reference ranges. This calculator is trusted by professionals and individuals alike because it follows the exact formulas validated by WHO, CDC, and NIH.

Accuracy Notes and Limitations

These results are screening estimates. Always consult a licensed healthcare provider before making changes to diet, medication, or exercise. The accuracy of any calculator is limited by the quality of the inputs provided. Double-check your units before entering values — unit errors are the most common source of incorrect results. For critical decisions, cross-reference with at least one additional source or professional consultation.

Frequently Used With

This calculator is often used alongside other health tools to build a complete analytical picture. Combining multiple related calculations provides stronger evidence for decisions than relying on any single metric. Browse the Health category to find complementary calculators for your specific use case.