Free height comparison calculator
Compare two heights in two seconds. Enter person A and person B in centimetres or feet and inches, and the calculator returns the difference (in cm and ft-in), who's taller, the ratio, and how much taller the taller person is as a percentage — updated live, as you type.
On this page13 sections
| Person | Height |
|---|---|
| Person A | 5 ft 10.9 in (180 cm) |
| Person B | 5 ft 5.0 in (165 cm) |
An exact comparison of the two heights you enter. How accurate is it?
Results are estimates. Consult a professional.
What is a height comparison calculator?
A height comparison calculator takes two heights — person A and person B — and tells you exactly how they relate: the difference between them, which person is taller, and how big the gap is as a ratio and a percentage. Enter two heights in centimetres or feet-and-inches and it returns all of that instantly, in whichever unit you are working in.
It answers the everyday question "how much taller is one person than another?" without the mental arithmetic of converting feet-and-inches to a single number and subtracting. Couples comparing themselves, parents tracking a child against a sibling, and sports fans sizing up two athletes all reach for the same tool — two heights in, the gap and its context out.
How to compare two heights
Comparing two heights is a short, fixed sequence. The only real work is getting both heights into the same unit first — everything after that is one subtraction and two divisions.
- Put both heights in the same unit. If one is in feet-and-inches and the other in centimetres, convert. The calculator keeps everything in centimetres internally (1 inch = 2.54 cm), so 5 ft 9 in becomes 175.3 cm.
- Find the difference. Subtract the shorter height from the taller: difference = taller − shorter. This is always a positive number, and it is what most people mean by "the height difference."
- Find the ratio. Divide the taller height by the shorter: ratio = taller ÷ shorter. A ratio of 1.10 means the taller person is 10% taller.
- Find the percentage. Express the gap relative to the shorter person: percentage taller = (taller − shorter) ÷ shorter × 100. The calculator does all four steps live as you type.
A worked example using the height comparison calculator
Alex is 5 ft 11 in (180 cm) and Sam is 5 ft 5 in (165 cm). Here is exactly how the calculator compares them.
Step 1 — Put both heights in one unit
Alex's 5 ft 11 in is 180 cm and Sam's 5 ft 5 in is 165 cm (using 1 inch = 2.54 cm). With both in centimetres, the comparison is just arithmetic.
Step 2 — Subtract to get the difference
180 cm − 165 cm = 15 cm, which is about 5.9 inches. Alex is the taller of the two, so the calculator labels Alex "taller" and reports a 15 cm (≈ 6 in) gap.
Step 3 — Work out the ratio and percentage
The ratio is 180 ÷ 165 = 1.09, and the percentage is (180 − 165) ÷ 165 × 100 = 9.1%. So Alex is about 9% taller than Sam.
Difference vs. ratio vs. percentage — three ways to compare heights
The calculator gives you three numbers for the same comparison, and they answer subtly different questions. Knowing which to quote keeps you from over- or under-stating a gap.
- The difference (e.g. 15 cm / 5.9 in) is the raw gap — the number you would measure with a tape held between the tops of two heads. It is absolute, so a 15 cm gap is 15 cm whether the pair is short or tall.
- The ratio (e.g. 1.09) tells you how many times one height is of the other. It is handy for scaling — a ratio of 1.09 means one person is 1.09× the other's height, so in a side-by-side drawing the taller bar is 9% longer.
- The percentage taller (e.g. 9.1%) restates the ratio as "X% taller," measured against the shorter person. It is the most intuitive way to say how much bigger the gap feels proportionally.
The same 15 cm gap is proportionally larger for a shorter pair than a taller one. Between 165 cm and 180 cm it is about 9% taller; between 185 cm and 200 cm — also a 15 cm gap — it is only about 8%. That is the whole reason the percentage and the difference can tell slightly different stories about "how big" a gap is.
Common height-gap examples
It helps to see where a gap sits among the differences people actually compare. The table below runs the model across common pairings, so you can find the one nearest yours and read across to the difference, ratio, and percentage.
| Height A | Height B | Difference | Ratio | A is taller by |
|---|---|---|---|---|
| 5 ft 6 in (168 cm) | 5 ft 4 in (163 cm) | 5 cm (2.0 in) | 1.03 | 3.1% |
| 5 ft 8 in (173 cm) | 5 ft 5 in (165 cm) | 8 cm (3.1 in) | 1.05 | 4.8% |
| 5 ft 10 in (178 cm) | 5 ft 5 in (165 cm) | 13 cm (5.1 in) | 1.08 | 7.9% |
| 5 ft 11 in (180 cm) | 5 ft 5 in (165 cm) | 15 cm (5.9 in) | 1.09 | 9.1% |
| 6 ft 0 in (183 cm) | 5 ft 4 in (163 cm) | 20 cm (7.9 in) | 1.12 | 12.3% |
| 6 ft 2 in (188 cm) | 5 ft 6 in (168 cm) | 20 cm (7.9 in) | 1.12 | 11.9% |
| 6 ft 4 in (193 cm) | 5 ft 7 in (170 cm) | 23 cm (9.1 in) | 1.14 | 13.5% |
Figures computed from the model (difference = |A − B|, ratio = taller ÷ shorter, percent = (taller − shorter) ÷ shorter × 100). Centimetre values are rounded, so the stated inch and percentage figures follow the exact cm values.
Couple and celebrity height differences
By far the most common use of a height difference calculator is comparing two partners — to see how the gap looks in photos, how it stacks up against the average, or just out of curiosity. So it helps to know what a "typical" gap actually is.
There is no fixed standard, but survey data puts the average gap in male-female couples at roughly 12 to 15 cm (5 to 6 inches) worldwide, with the man usually taller. A 15 cm gap — the worked example above — sits right in that typical band rather than being unusually large. Smaller gaps of a few centimetres are common too; the calculator simply reports whatever the two heights give.
| Pairing | Heights | Difference | Taller by |
|---|---|---|---|
| Average couple (low end) | 178 cm vs 165 cm | 13 cm (5.1 in) | 7.9% |
| Average couple (high end) | 180 cm vs 165 cm | 15 cm (5.9 in) | 9.1% |
| Same height | 170 cm vs 170 cm | 0 cm (0 in) | 0% |
| Large gap | 193 cm vs 160 cm | 33 cm (13.0 in) | 20.6% |
Illustrative pairings. "Average couple" uses the commonly cited 5–6 inch gap; the same-height and large-gap rows show the calculator's full range, including the equal-height case.
The same maths drives celebrity and athlete comparisons — pitting two actors, two basketball players, or a character against a real person. Whatever the pair, the calculator reduces it to one difference, one ratio, and one percentage, so the comparison is the same whether the gap is two centimetres or thirty.
How accurate is this height comparison calculator?
The arithmetic is exact — a subtraction and two divisions have no error. The only things that introduce any imprecision are the heights you feed in and the unit rounding, so a couple of points are worth knowing.
- It is only as accurate as your inputs. Self-reported heights are often rounded to the nearest inch, and people tend to round up. A true gap can differ by a centimetre or two from one computed off rounded heights.
- Feet-and-inches rounding. The calculator converts ft-in to centimetres with 1 inch = 2.54 cm. Displaying a centimetre result back as ft-in rounds to the nearest tenth of an inch, so a converted value can sit a hair off the exact figure.
- The percentage depends on direction. "Percent taller" is measured against the shorter person; a "percent shorter" against the taller person would be a slightly different number for the same pair. The calculator always reports how much taller the taller person is.
- It compares standing height only. It says nothing about why two people differ — build, posture, or footwear can all change how a gap looks in person versus on paper.
Methodology and sources
The comparison is pure arithmetic: the difference is the absolute value of A minus B, the ratio is the taller height divided by the shorter, and the percentage is the gap divided by the shorter height, times 100. Feet-and-inches convert with the exact factor 1 inch = 2.54 cm. The average-couple context figures come from published survey data on partner height gaps; the average US adult heights used to anchor the example pairings (men ≈ 175 cm, women ≈ 161 cm) are NHANES-style CDC figures.
Average adult height by sex (used to anchor example pairings): CDC / National Health and Nutrition Examination Survey (NHANES), Anthropometric Reference Data.International average heights and the spread between populations: NCD Risk Factor Collaboration (NCD-RisC).Frequently asked questions about the free height comparison calculator
About this height comparison calculator
This height comparison calculator runs entirely in your browser — the heights you enter never leave your device. It converts both heights to centimetres, then reports the difference, ratio, and percentage, updating instantly as you type.
Calculators Cloud offers 400+ free tools with no sign-up. If you want to know how a single height ranks rather than compare two, try the height percentile calculator; the Health calculators shelf also has BMI and ideal weight tools. Or browse the full calculator directory.