💱 Feet and Inches to CM Converter - Height Calculator

Short answer

One inch equals 2.54 centimeters, so a feet to cm conversion is: total inches (feet × 12 + inches) multiplied by 2.54. The ft to cm shortcut for whole feet is feet × 12 × 2.54, and the cm to inches direction divides by the same factor instead of multiplying. If you are wondering how many cm in a foot or how many cm in an inch: a foot holds 12 inches, so multiply the inch factor by 12 for one foot.

What this tool does not do: it does not interpret your height. No growth tracking, BMI, health meaning, clothing size or medical advice is produced here — only unit conversion.

Method & sources

• Rule version: 1.0.0 (inch-to-centimeter factor, editable)
• No source page was opened from this environment
• Reference starting points for the reader to check: NIST Office of Weights and Measures, NIST Special Publication 811, NIST Handbooks 44 and 130
• Author: Varnda Editorial Team.
• Corrections: use the contact page published on varnda.com; this page does not invent an email address.

How to use the calculator

1. Pick a direction: feet and inches to cm, or cm to feet and inches.
2. Enter feet and inches (inches may be a decimal such as 5.5), or switch to total inches, or enter centimeters in reverse.
3. Choose how many decimal places you want for the answer.
4. Press Convert. Read the centimeters, meters, total inches, the reverse reading and the step-by-step arithmetic.
5. Use Copy results or Print summary if you need the number on a form. Nothing leaves your browser.

How the ft to cm conversion is calculated

The engine uses exact decimal arithmetic (integer-scaled numbers), never raw binary floating point, so a displayed value such as 171.5 cm does not drift by a hidden fraction.

1. Total inches = feet × 12 + inches.
2. Centimeters = total inches × factor (default 2.54 cm per inch).
3. Meters = centimeters ÷ 100.
4. Reverse: total inches = centimeters ÷ factor; feet = whole inches ÷ 12 rounded down; remaining inches = total inches − feet × 12.
5. Rounding happens at display only, half up. If rounded inches reach 12, the tool carries one foot and shows 0 inches — never 5 feet 12 inches.

The inches to centimeters calculator keeps the factor visible and editable so you can see exactly what number produced the result. The cm to inches direction divides by the same factor.

Worked examples

Examples below were computed with exact decimal arithmetic using the default factor 2.54. Treat them as arithmetic illustrations, not as an official measurement.

Reverse examples: 180 cm equals about 70.87 inches, which reads as 5 ft 10.9 in at one decimal. 182.8 cm is about 71.97 inches; rounded to whole inches that is 72, shown as 6 ft 0 in — the carry rule at work.

Comparison: which direction do you need?

Comparison: how many decimal places should you keep?

Infographic: the calculation in three steps

Infographic: the same height on two rulers

Height conversion chart

The chart below is generated in your browser by the same engine as the calculator, from 4 ft 8 in up to 6 ft 6 in, so the numbers always match the factor you set above. Bars are a percentage of the tallest height in the chart; every value also appears as text.

Common mistakes and key conditions

• Forgetting the extra 12. 5 ft 10 in is 70 inches, not 5.83 inches — multiply feet by 12 first.
• Rounding too early. Keep full precision until the display step, or the last digit will drift.
• Showing 5 ft 12 in. If rounding pushes the inches to 12, carry a foot. This tool does that automatically.
• Mixing definitions. Old US survey feet are a different length from the international foot. This converter does not use survey feet and does not mix them in.
• Entering inches of 12 or more. The tool normalizes the value (for example 5 ft 14 in becomes 6 ft 2 in) and tells you it did so.
• Negative or empty fields. You get a plain validation message instead of a number.

FAQ

Glossary

Inch

A unit of length in US customary units. The tool treats one inch as the editable factor in centimeters (default 2.54).

Foot

Twelve inches. The feet-to-inches step of the conversion uses this definition exactly.

Centimeter

A metric unit of length. One meter is 100 centimeters.

Total inches

Height expressed as a single inch number before multiplying by the factor: feet × 12 + inches.

Carry

When rounded inches reach 12, one foot is added and the inches reset to zero (for example 5 ft 12 in becomes 6 ft 0 in).

Exact decimal arithmetic

Calculations kept in scaled integers so binary floating-point error never appears in a displayed result.

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Official references and last checked

The links below are official starting points you should check yourself:

• NIST Office of Weights and Measures — publisher of US weights and measures definitions.
• NIST Special Publication 811 — guide to SI units and conversion factors (candidate source for the inch factor).
• NIST Handbooks 44 and 130 — specifications and policies for weighing and measuring devices (candidate).

Limitations, exclusions and assumptions

• The conversion factor defaults to 2.54 cm per inch but was not source-verified; confirm with NIST before official use.
• Height percentile charts, BMI, clothing sizes, survey feet and construction tolerances are excluded on purpose.
• Inches are entered as decimals; fractional-inch entry (for example 5 5/8) is not built in this version.
• The page stores nothing on a server. The optional save uses this browser's local storage only.
• No credentialed human review was performed; the byline is the Varnda Editorial Team.

Changelog

• 2026-10-18 — version 1.0.0 published: forward and reverse conversion, editable factor, height conversion chart, infographics, print and copy helpers.

Summary

This page is a feet and inches to cm converter and the matching reverse tool, built around exact decimal arithmetic, a visible editable factor and a height conversion chart that is generated by the engine. Use it for forms, profiles and travel documents; check the factor with NIST when the number has to stand up to official scrutiny, and do not use it for any health question.

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