About Inches → Cm
Inches appear on US rulers, screen specs, and wrench sizes. Centimeters align with metric workshops and medical devices abroad.
Multiply inches by 2.54 for centimeters exactly.
Use when your source measurement is in inches.
Length
Inches to Cm Converter
Inches appear on US rulers, screen specs, and wrench sizes. Centimeters align with metric workshops and medical devices abroad.
How to use this tool
Input inches (decimals or fractions as supported). Calculate for centimeters.
Formula & methodology
This inches to cm converter applies the standard relationship below. Intermediate values are kept at full precision; only the displayed result is rounded.
cm = inches x 2.54
Tips for accurate results
- Phone screen 6.1 in diagonal is about 15.49 cm.
- Do not confuse inches of mercury (pressure) with length inches.
- Reverse: cm-to-inches.
- For compound feet/in, convert to total inches first or use ft-to-cm.
Frequently asked questions
1 inch in cm?
Exactly 2.54 cm.
Fractional inches?
Enter decimal equivalents (e.g., 1/4 = 0.25) if the form requires decimals.
Free?
Yes.
Ruler reading?
Align zero carefully; parallax affects small measurements.
Sources & references
The factors and formulas used by this tool follow these references:
- NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
- BIPM — The International System of Units (SI Brochure, 9th edition)
Last reviewed: September 2026. Found an error? Tell us and we will correct it.
Further reading
Guides that explain the ideas behind this calculator.
Related tools
More calculators in Length.