Height Tools — Compare, Calculate & Convert
Free online tools to compare heights side by side, convert between metric and imperial units, estimate adult height from parents, and browse average heights by country.
Human height is measured in centimeters (metric) or feet and inches (imperial). Whether you need a quick unit conversion, a side-by-side visual comparison, or population data by country, each tool on this site is built for a specific task — no sign-up required.
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Our height tools
Each tool solves a specific height-related task. Pick the one you need or browse all tools.
Try the height comparison tool
Add two or more people below to see a visual side-by-side chart. Enter heights in cm, feet, or inches — the chart updates instantly.
Height Comparison Chart
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Guides and resources
Height measurement varies by region: most countries use the metric system (centimeters and meters), while the United States and a few others use feet and inches. Converting between systems is a common need — for example, 180 cm equals 5 feet 11 inches.
Our height calculator uses parental height to estimate a child's adult stature, based on published mid-parental height formulas. For population context, our country data draws on WHO growth references and national health surveys. Read our blog for step-by-step guides on conversions, growth prediction, and how to use each tool effectively.