Decimeters to Millimeters
Convert decimeters to millimeters instantly. 1 dm = 100 mm. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert decimeters to millimeters
To convert decimeters to millimeters, multiply by 100. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
mm = dm × 100
Decimeters to Millimeters conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Decimeters | Millimeters |
|---|---|
| 1 dm | 100 mm |
| 2 dm | 200 mm |
| 3 dm | 300 mm |
| 5 dm | 500 mm |
| 10 dm | 1,000 mm |
| 20 dm | 2,000 mm |
| 25 dm | 2,500 mm |
| 50 dm | 5,000 mm |
| 100 dm | 10,000 mm |
| 500 dm | 50,000 mm |
| 1,000 dm | 100,000 mm |
What is a decimeter?
A tenth of a metre. Rare in practice, but it is the cube root of the litre.
What is a millimeter?
A thousandth of a metre. The default fine unit on metric engineering drawings.
The formula
mm = dm × 100
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Decimeters to Millimeters
- Type the number of decimeters you want to convert.
- Read the result in millimeters straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked millimeters to decimeters page.
Decimeters to Millimeters — frequently asked questions
How many millimeters are in a decimeter?
One decimeter equals 100 mm. mm = dm × 100
What is the formula to convert decimeters to millimeters?
The formula is mm = dm × 100. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert millimeters back to decimeters?
Divide instead of multiplying: one millimeter is 0.01 dm. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this decimeters to millimeters free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error