Enter a height to get a rough head-circumference estimate using a simple linear equation. You can also enter head circumference to estimate height, or use the hat-size tab to convert circumference to common hat sizes.
Medical note: Head circumference is normally measured directly with a tape (and, for infants/children, interpreted using age- and sex-specific CDC/WHO growth charts). The height ↔ head-circumference tab here is a rough, adult-oriented estimate and is not suitable for diagnosing or assessing child growth or any medical condition. If you need an accurate clinical measurement, consult a qualified clinician.
- All Health and Medical Calculators
- Height to Arm Span Calculator
- Height to Leg Length Calculator
- Height to Shoulder Width Calculator
- Height to Neck Length Calculator
- Height to Chest Circumference Calculator
Height to Head Circumference Formula
The following equation is used by this calculator to generate a rough head-circumference estimate from height:
HC = H * 0.1143 + 14
Variables:
- HC is the estimated head circumference (inches)
- H is the height of the person (inches)
To estimate head circumference, multiply the person's height by 0.1143 and then add 14 inches to the result.
Limitations
- This is a simple linear approximation; real body proportions vary between individuals.
- Results can differ based on age, sex, ancestry, and measurement technique.
- The calculator’s built-in range checks are intended for typical adult values; out-of-range inputs are blocked because the estimate becomes unreliable.
| Height (in) | Head Circumference (in) |
|---|---|
| 54 | 20.172 |
| 56 | 20.401 |
| 58 | 20.629 |
| 60 | 20.858 |
| 62 | 21.087 |
| 64 | 21.315 |
| 66 | 21.544 |
| 68 | 21.772 |
| 70 | 22.001 |
| 72 | 22.230 |
| 74 | 22.458 |
| 76 | 22.687 |
| 78 | 22.915 |
| 80 | 23.144 |
| 82 | 23.373 |
| 84 | 23.601 |
| Equation used by this page: Head Circumference (in) = 0.1143 × Height (in) + 14. | |
What is Head Circumference?
Head circumference is a measurement taken around the widest part of the head (commonly just above the eyebrows and ears, around the back of the head). In healthcare settings it is measured directly with a tape, and for infants and children it is typically interpreted using age- and sex-specific growth charts (such as CDC/WHO references).
How to Calculate Head Circumference from Height?
The following steps outline how to estimate head circumference from height:
- Measure the person's height (H) in inches.
- Use the formula HC = H * 0.1143 + 14.
- Calculate the estimated head circumference (HC) in inches.
- Use the calculator above to do the arithmetic quickly.
Example Problem:
Height (H) = 70 inches
Using the formula, the estimated head circumference (HC) would be:
HC = 70 * 0.1143 + 14 ≈ 22.001 inches
