Height Calculator

Estimate adult height or convert between height units

Expected adult height (mid-parental estimate)

The mid-parental method averages the parents' heights and adds 6.5 cm for boys or subtracts 6.5 cm for girls. The typical range is about ±8.5 cm. This is a population-level estimate, not a growth-chart percentile or a medical prediction.

Expected adult height: 5 ft 9.9 in

Expected adult height: 5 ft 9.9 in (177.5 cm)
Mid-parental height: 171.0 cm
Typical range: 169.0–186.0 cm
Mother's height: 164.0 cm
Father's height: 178.0 cm

Growth is influenced by nutrition, health, and timing of puberty. A pediatrician should evaluate any concern about a child's growth.

Height unit converter

177.8 cm

Centimeters: 177.8 cm
Total inches: 70 in
Feet and inches: 5 ft 10 in
Conversion: 1 in = 2.54 cm exactly

Length, weight, and volume conversions use internationally defined factors. Temperature conversions use the standard offset formulas. Height uses 1 inch = 2.54 centimeters exactly.

What this calculator does

The Height Calculator converts a person's height between the metric system and the customary units used in the United States. It supports both directions: centimeters to feet and inches, and feet and inches to centimeters. The result includes the converted height as a decimal and, when converting from centimeters, a feet-and-inches breakdown that is easier to read.

Height conversions are common when traveling, shopping for clothing, filling out medical or sports forms, or comparing measurements from different countries. Because the inch is defined as exactly 2.54 centimeters, the arithmetic is exact for any value you enter; only the displayed rounding introduces a small approximation.

How to use this calculator

Choose whether you are converting centimeters to feet and inches or feet and inches to centimeters.
For a centimeter conversion, enter the height in centimeters.
For a customary conversion, enter the number of whole feet and the remaining inches. The inches part must be less than 12.
Click Calculate.

The default sample converts 178 centimeters to 5 feet 10.08 inches. A second common example is 5 feet 10 inches, which equals 177.8 centimeters. The Clear button restores the sample values for the selected direction.

Formulas

The only constant needed is the exact definition of the international inch:

1 inch = 2.54 centimeters

Centimeters to feet and inches:

total inches = centimeters ÷ 2.54
feet = floor(total inches ÷ 12)
inches = total inches − feet × 12

Feet and inches to centimeters:

total inches = feet × 12 + inches
centimeters = total inches × 2.54

What the results mean

The result panel shows the converted height, the equivalent total inches, and the feet-and-inches form. For example, 178 centimeters is about 70.0787 inches, which is 5 feet 10.0787 inches. The calculator keeps the full internal value and rounds only for display, so repeated conversions do not progressively lose accuracy.

If you enter feet and inches, the inches field must be below 12. For example, instead of 5 feet 14 inches, enter 6 feet 2 inches. The calculator rejects the invalid form rather than quietly normalizing it, which helps catch data-entry mistakes.

Assumptions and limitations

This page converts height units only. It does not predict adult height from a child's age, weight, or parents' heights.
The calculator assumes the international inch of exactly 2.54 centimeters. Historical or local definitions of the inch are not used.
Feet must be entered as a whole number. Decimal feet are not accepted because the form separates feet and inches.
The inches part must be between 0 and 11.99. Zero inches is allowed when the feet value is positive.
Displayed values are rounded, so the feet-and-inches result may differ from the original by a tiny fraction of an inch.
The calculator does not account for measurement uncertainty, posture, time of day, or other real-world factors that affect measured height.

Frequently asked questions

How many centimeters are in an inch?

One inch is exactly 2.54 centimeters. This definition has been internationally agreed upon since 1959, so conversions between inches and centimeters do not depend on the country or the measuring instrument.

How do I convert 5 feet 10 inches to centimeters?

Multiply 5 by 12 to get 60 inches, add 10 inches to get 70 inches, then multiply by 2.54. The result is 177.8 centimeters.

Why does the converter show 5 feet 10.08 inches for 178 centimeters?

The exact conversion of 178 centimeters is about 70.0787 inches. That is 5 feet plus 10.0787 inches, which rounds to 5 feet 10.08 inches at two decimal places.

Can I enter a height with 14 inches?

No. The inches field must be less than 12. Convert 5 feet 14 inches to 6 feet 2 inches before calculating.

Reference table

Example child heights

Child's Height	cm
2 years	86
4 years	103
6 years	116
8 years	128
10 years	139
12 years	151

These are rough population averages for illustration, not growth-chart percentiles. Individual children vary widely; use a pediatric growth chart for assessment.

Source

Reference: Calculator.net — Height Calculator. The inch-to-centimeter relationship is the international standard definition.

Disclaimer

This calculator is provided for general information and everyday conversion. It is not a medical tool and should not be used to assess growth, diagnose a health condition, or replace advice from a qualified professional.

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