One shared baseline
Height Comparison Tool
To compare two people's heights, add each person with a name and a height in either feet and inches or centimetres. Everyone is drawn on one shared scale from the same baseline, so 200 cm appears exactly twice as tall as 100 cm, and the difference between any two is shown below the chart.
Height comparison
See how different heights compare side by side.
Compare heights visually
Add two or more people to see how their heights compare.
Everyone is drawn on the same scale, standing on the same baseline.
Height difference
Comparison summary
| Person | Model | Height (ft/in) | Height (cm) | vs average |
|---|
How the chart stays honest
Every height you type is converted to centimetres and stored that way. The chart then works out a single scale — the drawing area divided by the top of the ruler — and multiplies every person by it. One scale, one baseline, no exceptions.
That is what makes the comparison trustworthy. A 200 cm model is exactly twice the height of a 100 cm model on screen, and a 180 cm model is exactly 20% taller than a 150 cm one. The silhouettes scale as a whole, so nobody is stretched or squashed to fit.
The ruler adjusts to the tallest person in the group, rounded up to a tidy 20 cm mark with a little headroom above. Add someone taller and everything rescales together, keeping the proportions intact.
Feet and inches, or centimetres
Switch the input unit before you type and the fields change to match. Whatever you enter is converted with cm = feet × 30.48 + inches × 2.54, so 5 ft 10 in is stored as exactly 177.8 cm rather than a rounded 178.
Going the other way, centimetres are turned back into feet and inches and the inches are carried properly, so you will never see a nonsensical 5'12". 180 cm shows as 5 ft 11 in; 182.88 cm shows as a clean 6 ft.
The ruler has its own unit switch, independent of the input. You can type in centimetres and read the chart in feet, which is useful when you are explaining a measurement to someone who thinks in the other system.
Comparing two people
With two or more people on the chart, the difference panel compares the first two in the current sort order. Change the sort to tallest-first and it compares the tallest with the second tallest; leave it on added order and it compares the two you added first.
The difference is given in both systems — "10.16 cm, or 4 in" — because the round number in one system is rarely round in the other. Four inches is the figure most people quote; 10.16 cm is what it actually is.
What this tool is not
It draws the numbers you give it. It does not estimate anyone's height from a photo, predict adult height from a child's, or know anything about average heights by country. If you type the wrong number, the chart will be wrong and look perfectly convincing.
The silhouettes are a normalised human shape scaled to each height, not a model of individual body proportions. Two people of the same height are drawn identically even though real bodies differ in leg and torso length.
Frequently asked questions
How do I compare two people's heights?
Add each person with a name and a height, in feet and inches or in centimetres. Both appear on the chart at the same scale, and the panel underneath tells you who is taller and by how much in both units.
How accurate is the comparison?
The drawing is exact to the numbers you enter: everyone is multiplied by the same scale from the same baseline, so the ratios on screen match the ratios you typed. The accuracy of the result depends entirely on the accuracy of your measurements.
How many people can I compare at once?
Up to 30. The layout is comfortable to about 20; past that the chart scrolls sideways inside its own box while the ruler stays put.
Can I compare male and female heights?
Yes. Each person gets a male or female silhouette, and both are scaled by the identical factor — the model only changes the shape drawn, never the height.
How is the visual height calculated?
The chart divides its drawing height by the top of the ruler to get one scale factor, then multiplies each person's centimetres by it. Pixel heights are kept fractional on purpose, because rounding them would break the exact ratios.
Can I share my height comparison?
Yes. Share comparison copies a link that carries the names, heights, models and colours. Anyone who opens it sees the same chart. Uploaded photos are not included in the link.
What happens to a photo I upload?
It is read by your browser and used to draw the model. It is never uploaded, never put in a share link, and disappears when you reload the page.
Why is 5 ft 10 in stored as 177.8 cm and not 178?
Because 177.8 is the exact conversion. Rounding each person to the nearest centimetre would introduce small errors into the chart and into the difference between two people, so the exact value is kept and only the display is rounded.