# Micrometers to Parsecs (μm to pc)

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

**1 μm = 3.2407792894444E-23 pc**

One micrometer equals approximately 3.241 x 10-23 parsecs. A parsec contains about 3.086 x 1022 micrometers. The micrometer measures cells; the parsec measures interstellar distances. About 22 orders of magnitude separate them.

## Formula

Convert Micrometers to Parsecs

## Conversion Table

| Micrometers (μm) | Parsecs (pc) |
|---|---|
| 1 μm | 0 pc |
| 100 μm | 0 pc |
| 10000 μm | 3.2E-19 pc |
| 1000000 μm | 3.24E-17 pc |
| 100000000 μm | 3.24077E-15 pc |
| 10000000000 μm | 3.2407792E-13 pc |
| 1000000000000 μm | 3.240779289E-11 pc |
| 100000000000000 μm | 3.24077928944E-9 pc |
| 10000000000000000 μm | 3.2407792894443E-7 pc |
| 1000000000000000000 μm | 3.2407792894444E-5 pc |
| 100000000000000000000 μm | 0.0032407792894444 pc |
| 10000000000000000000000 μm | 0.32407792894444 pc |

## 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.

### Parsec (pc)

The distance at which one astronomical unit subtends an angle of one arcsecond. Approximately 3.26 light-years or 30.857 trillion kilometers. The standard unit in professional astronomy.

## Background

Proxima Centauri at 1.3 parsecs is about 4.01 x 1022 um away. A red blood cell (7 um) is 2.27 x 10-22 parsecs across. No measurement gap is wider than between the tools of biology and the tools of astronomy.

## Good to Know

The micrometer and parsec represent the two frontiers of human measurement: inward (biology) and outward (astronomy). Between them lies everything else. Humanity measures from the cell to the star, spanning 22 orders of magnitude with instruments that fit on a desk or a mountaintop.

## FAQ

### How many parsecs is 1 micrometer?

One micrometer equals approximately 3.241 x 10-23 parsecs.

### How many micrometers are in 1 parsec?

One parsec contains approximately 3.086 x 1022 um.

### Is this conversion used?

Never. Cells and stars are separated by 22 orders of magnitude.

## Non-Frequently Asked Questions

### Could all the cells in the universe, laid end-to-end, span 1 parsec?

There are roughly 1030 cells on Earth. At 20 um each, they span 2 x 1022 um = about 0.65 parsecs. So all of Earth's cells ALMOST reach 1 parsec. If the universe has many Earth-like planets, combined cellular life might span parsecs. Life might literally reach the stars, cell by cell.

### What is the smallest thing an optical telescope can see at 1 parsec?

The best ground telescopes resolve about 0.05 arcseconds. At 1 parsec, that is about 7.5 AU = 1.12 x 1015 um. The smallest visible object at 1 parsec is about a trillion micrometers across. Individual cells are about 1012 times too small to see. Microscopes and telescopes are tools for opposite extremes.

### Is a biologist or an astronomer measuring more extreme scales?

A biologist measures down to about 0.2 um (200 nm, optical limit). An astronomer measures up to about 10 billion parsecs (observable universe). From 0.2 um to 3 x 1032 um, that is 33 orders of magnitude. Humanity's measurement range spans from the sub-cellular to the cosmic. We are ambitious measurers.

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## See Also

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