Height Difference Calculator

A height difference is the vertical distance between the tops of two people standing on the same level surface. It does not depend on their distance from each other, provided both measurements use the same convention—usually barefoot standing height.

Use the absolute gap for “how many centimetres apart?” and the signed gap for “which entry is taller?” You can add names to keep track of A and B when comparing friends, family or characters.

Subtract B from A to get the signed difference. A positive value means A is taller; a negative value means B is taller. Taking its absolute value gives a gap that is always zero or positive. Switching A and B reverses the sign but cannot change that absolute gap.

A divided by B expresses the height ratio. The percentage uses B as its denominator: (A − B) ÷ B × 100. That choice matters. If 180 cm is compared with 160 cm, A is 12.5% taller than B. After swapping, 160 cm is about 11.11% shorter than 180 cm—not 12.5%—because the reference height changed.

One international inch is exactly 2.54 centimetres, and one foot is exactly 12 inches. Convert feet and inches by multiplying the feet by 12, adding the inches, then multiplying the total by 2.54. The calculator normalizes both entries to centimetres before comparing them.

In feet/inches mode, enter whole feet and inches from 0 up to—but not including—12. A measurement of 5 ft 12 in should be entered as 6 ft 0 in. Decimal inches such as 7.5 are allowed. Decimal feet are a different notation: 5.7 ft is 5 ft 8.4 in, not 5 ft 7 in.

For A = 180 cm and B = 165 cm, subtracting gives +15 cm. The absolute gap is 15 cm, equal to about 5.91 inches. A/B is about 1.091, and A is about 9.09% taller relative to B.

The table keeps B as the reference in every row. Values are rounded for reading; the underlying calculation uses the entered measurements. The same 10 cm gap produces a larger percentage when the reference person is shorter.

Use a flat floor and a vertical wall or a stadiometer. Remove footwear, stand upright without stretching and look straight ahead. A flat object placed squarely on the crown of the head can help mark the measurement; avoid measuring to the top of hair.

For the fairest comparison, measure both people with the same equipment and convention. Shoes, sloping floors and posture can create a gap that is not present in barefoot standing height. Height also varies somewhat during the day, so repeat measurements at a similar time if you are tracking a small difference.

• Record the original unit before converting.
• Repeat an uncertain reading instead of adding decimal places.
• Use a rigid, vertical measuring reference rather than judging a photo by eye.
• Compare like with like: barefoot to barefoot, or clearly labelled shoe-on measurements.

Both silhouettes stand on one floor line and use the same scale, so a height twice as large would be drawn twice as tall. Horizontal guide lines help you compare the top of each head without relying on body shape or perspective.

The silhouettes are generic illustrations scaled as whole shapes. Real people have different leg, torso, neck and head proportions. You cannot infer someone's eye level, shoulder position, reach, age or body type from this diagram. For very small gaps, the numerical result is more informative than a few screen pixels.

Compare partners, friends or siblings, check character heights for a story, or put an athlete’s height beside one you know. The figures show the overall gap while the numbers give its size.

Writers and artists can use a consistent scale while planning a scene, but should adjust anatomy and perspective separately. For equipment, ergonomics or clothing, standing height alone is not enough: inseam, reach, sitting height and product-specific measurements may be more relevant. A height gap also says nothing about compatibility, ability or health.

This calculator compares two numerical heights from 0.1 to 300 cm. It does not estimate height from photographs, predict adult height, or calculate growth percentiles. The output is only as accurate as the values you enter, and conversion cannot recover precision that was never measured.

For several people, reference objects or a scene you can rotate, open the free 3D height comparison on the homepage. Enter your heights there manually. Keep this page handy when you need the exact gap, ratio or percentage between two entries.