Online calculator to convert millimeters to decimeters (mm to dm) with formulas, examples, and tables. Our conversions provide a quick and easy way to convert between Length or Distance units.
Conversion Calculator
Enter your value in the conversion calculator below.
Convert mm to dm
TIP: If the result of your conversion is 0, try increasing the "Decimals".
Conversion Definitions
The following is a list of definitions relating to conversions between millimeters and decimeters.
What is a millimeter (mm)?
A millimeter is a unit of Length or Distance in the Metric System. The symbol for millimeter is mm. There are 100 millimeters in a decimeter. The International spelling for this unit is millimetre.
What is a decimeter (dm)?
A decimeter is a unit of Length or Distance in the Metric System. The symbol for decimeter is dm. There are 0.01 decimeters in a millimeter. The International spelling for this unit is decimetre.
Conversion Formula
Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.
The formula to convert from mm to dm is:
dm = mm ÷ 100
Conversion Example
Next, let's look at an example showing the work and calculations that are involved in converting from millimeters to decimeters (mm to dm).
Millimeter to Decimeter Conversion Example
Task: Convert 250 millimeters to decimeters (show work) Formula: mm ÷ 100 = dm Calculations: 250 mm ÷ 100 = 2.5 dm Result: 250 mm is equal to 2.5 dm
Conversion Table
For quick reference purposes, below is a conversion table that you can use to convert from mm to dm.
Millimeters to Decimeters Conversion Chart
| millimeters (mm) | decimeters (dm) |
|---|---|
| 1 mm | 0.01 dm |
| 2 mm | 0.02 dm |
| 3 mm | 0.03 dm |
| 4 mm | 0.04 dm |
| 5 mm | 0.05 dm |
| 6 mm | 0.06 dm |
| 7 mm | 0.07 dm |
| 8 mm | 0.08 dm |
| 9 mm | 0.09 dm |
| 10 mm | 0.1 dm |
| 20 mm | 0.2 dm |
| 30 mm | 0.3 dm |
| 40 mm | 0.4 dm |
| 50 mm | 0.5 dm |
| 75 mm | 0.75 dm |
| 100 mm | 1 dm |
| 250 mm | 2.5 dm |
| 500 mm | 5 dm |
| 750 mm | 7.5 dm |
| 1,000 mm | 10 dm |
| 2,500 mm | 25 dm |
| 5,000 mm | 50 dm |
| 7,500 mm | 75 dm |
| 10,000 mm | 100 dm |
| 25,000 mm | 250 dm |
| 50,000 mm | 500 dm |
| 75,000 mm | 750 dm |
| 100,000 mm | 1,000 dm |
| 250,000 mm | 2,500 dm |
Related Units
This table provides a summary of the Length or Distance units within their respective measurement systems.
| Unit | Symbol | Measurement System |
|---|---|---|
| inches | in or " | US Customary Units/Imperial System |
| feet | ft or ' | US Customary Units/Imperial System |
| yards | yd | US Customary Units/Imperial System |
| miles | mi | US Customary Units/Imperial System |
| picometers | pm | Metric System |
| nanometers | nm | Metric System |
| micrometers | μm | Metric System |
| millimeters | mm | Metric System |
| centimeters | cm | Metric System |
| decimeters | dm | Metric System |
| meters | m | Metric System |
| decameters | dam or dkm | Metric System |
| hectometers | hm | Metric System |
| kilometers | km | Metric System |
| megameters | Mm | Metric System |
| gigameters | Gm | Metric System |
| nautical miles | M or NM or nmi | Non-SI (International) |
| angstroms | Å | Non-SI (International) |
| rods | rod | Non-SI (International) |
Note: For Length and Distance conversions, US Customary Units and the Imperial System are equivalent.
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