How many millimeters are in a centimeter?

One centimeter equals exactly 10 millimeters. Multiply any centimeter value by 10 to get millimeters.

How do I convert millimeters back to centimeters?

Divide the millimeter value by 10. For example, 250 mm ÷ 10 = 25 cm.

Is this converter accurate?

Yes. The conversion factor (×10 or ÷10) is exact with no rounding error. Results are displayed to up to 6 significant figures to avoid floating-point display noise.

What is the difference between a centimeter and a millimeter?

A millimeter is one-tenth of a centimeter. The prefix "milli-" means 1/1000 and "centi-" means 1/100 in the SI system, so 10 mm = 1 cm.

Can I convert negative values?

Yes. Negative values are valid for displacement or offset calculations and the converter handles them correctly.

Is 1 cm the same as 10 mm?

Yes, exactly. 1 cm = 10 mm by definition, so 100 cm = 1,000 mm and 15 cm = 150 mm.

Centimeters to Millimeters Converter

Name: Centimeters to Millimeters Converter
Availability: InStock
Author: Nham Vu

Instantly convert centimeters to millimeters (and back) with a quick-reference table for common values.

Convert Length

Centimeters (cm)

Millimeters (mm)

Enter a value above to see the result

Quick-Reference Table

Centimeters (cm)	Millimeters (mm)

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Summary

Instantly convert centimeters to millimeters (and back) with a quick-reference table for common values.

How it works

Enter a centimeter value in the top field.
The tool multiplies by 10 to give you the equivalent in millimeters.
You can also type a millimeter value in the bottom field to convert back to centimeters.
Use the swap button to flip the direction of conversion.
Copy the result with one click or reset both fields at any time.

Use cases

Convert engineering or technical drawings from centimeters to millimeters.
Convert body or garment measurements for precise tailoring.
Translate ruler readings between centimeter and millimeter scales.
Quick reference for students learning the metric system.
Convert material or component dimensions for manufacturing tolerances.
Verify scientific measurements that mix centimeter and millimeter units.
Convert architectural scale dimensions to millimeters for CAD software.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu