Height Calculator
This calculator converts height between feet-and-inches and centimeters — nothing more. If you’re looking for a tool to predict a child’s adult height, check a growth percentile, or calculate a height-to-weight ratio, this isn’t the right page; it does one specific job: converting a height measurement between the two most common unit systems, accurately and instantly.
How the Height Calculator Works
Choose your conversion direction — feet and inches to centimeters, or centimeters to feet and inches — enter your value, and the calculator applies the fixed conversion factor: one inch equals exactly 2.54 centimeters. From that single relationship, it derives your height in centimeters, meters, and total inches, or in feet-and-inches format, depending on which direction you’re converting.
Why 2.54 Centimeters Per Inch Is an Exact Number, Not a Rounded One
Unlike many unit conversions that rely on rounded or approximate figures, one inch equals exactly 2.54 centimeters by international agreement — a definition standardized in 1959 across English-speaking countries specifically to eliminate the small but real discrepancies that existed between slightly different national definitions of the inch beforehand. This means height conversions between feet-and-inches and centimeters are perfectly precise, with no rounding error at all — any discrepancy you might notice between two different conversion tools comes down to how the final result is rounded for display, not from any ambiguity in the underlying conversion factor itself.
Why the US Uses Feet and Inches While Most of the World Uses Centimeters
Height in the United States is conventionally expressed in feet and inches (5’10”, for example) as part of the broader imperial measurement system still used for everyday measurements there, while most other countries adopted the metric system decades ago, making centimeters the standard height unit internationally. This split creates a genuine practical need for conversion — filling out an international form, comparing a US measurement against a foreign standard (a passport, a visa medical form, an international shoe or clothing size chart), or simply communicating height clearly with someone from a different measurement background.
Common Conversion Reference Points
| Feet & Inches | Centimeters |
|---|---|
| 5’0″ | 152.4 cm |
| 5’4″ | 162.6 cm |
| 5’6″ | 167.6 cm |
| 5’8″ | 172.7 cm |
| 5’10” | 177.8 cm |
| 6’0″ | 182.9 cm |
| 6’2″ | 188.0 cm |
These figures follow directly from the fixed 2.54 cm-per-inch relationship; the calculator computes the exact equivalent for any height, not just these common reference points.
What This Calculator Doesn’t Do: BMI and Weight-Related Calculations
Height alone doesn’t say much about health or body composition on its own — it’s almost always paired with weight for anything meaningful in that direction. If you actually want to check body mass index, a widely used (though limited) screening measure that combines height and weight, the BMI Calculator is the correct tool, and it accepts height directly in either feet-and-inches or centimeters, so you don’t need to convert your height here first before using it.
Predicting a Child’s Adult Height: A Different Calculation Entirely
If you searched for a height calculator hoping to estimate how tall a child will grow up to be, that’s a fundamentally different calculation than unit conversion — it typically uses parental heights combined with statistical growth formulas (like the mid-parental height method), not a simple unit conversion at all. That specific predictive calculation isn’t covered by this tool or currently available elsewhere on this site; height prediction formulas are separate from, and unrelated to, the straightforward unit conversion this calculator performs.
Weight Conversions Follow the Same Logic
Just as height conversion relies on a fixed, exact relationship between inches and centimeters, weight conversion between pounds and kilograms follows its own fixed conversion factor (1 pound equals exactly 0.45359237 kilograms). If you need to convert weight alongside height — for a medical form, an international comparison, or simply personal reference — the Weight Calculator handles that conversion using the same precise, non-rounded approach this height calculator applies.
Other Unit Conversions You Might Need Alongside Height
Height and weight aren’t the only measurements that commonly need converting between US and international units. Clothing and shoe sizing, in particular, don’t follow simple fixed formulas the way height and weight do, since sizing systems are set by manufacturers and vary by brand and country. The Shoe Size Conversion calculator handles that separate, brand-dependent conversion, distinct from the fixed physical unit conversion this height calculator performs.
General Unit Conversions Beyond Height
If you need to convert length measurements outside the specific height context — general distances, dimensions, or measurements in feet, meters, or other length units unrelated to a person’s height — the broader Conversion Calculator handles length conversions across a wider range of units, alongside mass, volume, area, speed, and data units in the same tool.
Frequently Asked Questions
How many centimeters is 5 feet 10 inches?
177.8 centimeters. This comes from converting the total height to inches first (70 inches), then multiplying by the exact conversion factor of 2.54 centimeters per inch.
Is the inch-to-centimeter conversion exact, or rounded?
It’s exact. One inch equals precisely 2.54 centimeters by international standardization agreed upon in 1959, so height conversions carry no inherent rounding error — any variation you see between tools comes only from how the final displayed result is rounded.
Can this calculator predict how tall a child will be as an adult?
No — this tool only converts an existing height measurement between unit systems. Predicting adult height from a child’s current measurements and parental heights requires a different statistical method entirely, which isn’t covered by this calculator.
Does this calculator also compute BMI?
No, this tool performs unit conversion only. For BMI, which combines height and weight into a single screening measure, use the dedicated BMI Calculator, which accepts height in either unit system directly.
Why do some countries use feet and inches while others use centimeters?
It comes down to which measurement system a country historically adopted. The United States continues to use the imperial system (feet and inches) for everyday measurements, while most other countries switched to the metric system (centimeters) as their standard decades ago, which is exactly why conversion between the two remains a common practical need.