# Micrometers to Decimeters (μm to dm)

Source: https://www.unitconvertercalculator.com/length/micrometers-to-decimeters/

**1 μm = 1.0E-5 dm**

One micrometer equals exactly 0.00001 decimeters (10-5 dm). A decimeter (100,000 um) is about the width of a liter bottle. The micrometer measures cells; the decimeter measures liter-scale objects. Five orders of magnitude separate them.

## Formula

Convert Micrometers to Decimeters

## Conversion Table

| Micrometers (μm) | Decimeters (dm) |
|---|---|
| 1 μm | 1.0E-5 dm |
| 10 μm | 0.0001 dm |
| 100 μm | 0.001 dm |
| 1000 μm | 0.01 dm |
| 10000 μm | 0.1 dm |
| 100000 μm | 1 dm |
| 500000 μm | 5 dm |
| 1000000 μm | 10 dm |
| 5000000 μm | 50 dm |
| 10000000 μm | 100 dm |

## Units

### Micrometer (μm)

One millionth of a meter, also called a micron. Used in biology for cell sizes, in engineering for surface finishes, and in manufacturing tolerances.

### Decimeter (dm)

One tenth of a meter, or 10 centimeters. Used in some European countries for everyday measurements and in education.

## Background

A decimeter contains 100,000 micrometers. A red blood cell (7 um) is 0.00007 dm. A liter bottle (about 1 dm wide) contains about 100,000 cell-widths across its diameter.

## Good to Know

The decimeter defines the liter (1 dm3). The micrometer defines the cell. Inside every liter of water, blood, or milk, trillions of micrometer-scale objects exist. The decimeter contains the liter; the micrometer contains the biology inside it.

## FAQ

### How many decimeters is 1 micrometer?

One micrometer equals exactly 10-5 dm (0.00001 decimeters).

### How many micrometers are in 1 decimeter?

One decimeter contains exactly 100,000 micrometers (105 um).

### Is this conversion practical?

Rarely directly. Micrometers and decimeters serve different scales. Converting to millimeters or centimeters is more common.

## Non-Frequently Asked Questions

### How many bacteria fit across a water bottle?

A 1-liter bottle is about 1 dm (100,000 um) wide. A bacterium is about 2 um. So roughly 50,000 bacteria fit across your water bottle. They are already there. You just cannot see them. Enjoy your water.

### How many red blood cells fill a liter?

A red blood cell is about 7 um across and 2 um thick. A liter is 1 dm3 = 1015 cubic micrometers. A red blood cell occupies about 90 um3. So roughly 11 trillion red blood cells fill a liter. Your body has about 25 trillion of them - enough to fill about 2.3 liters. You are partly a blood cell soup.

### Is a decimeter 100,000 of anything interesting?

A decimeter is 100,000 micrometers, which is about 100,000 bacteria-widths, 14,000 red blood cells, or 1,333 human hair widths. The most interesting thing about a decimeter is that it is exactly 1 million blood cell widths per liter bottle. Biology fits neatly into metric units.

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## See Also

- [Decimeters to Micrometers](https://www.unitconvertercalculator.com/length/decimeters-to-micrometers/)