Convert Micrometer to Petameter
Convert micrometers to petameters instantly. 1 micrometer = 1e-21 petameter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Petameter to Micrometer converter for the reverse conversion.
Units explained
Micrometer
A micrometer (also called a micron) is a metric unit of length equal to one millionth of a meter (1×10⁻⁶ m). It is the standard unit for measuring microscopic dimensions in biology, materials science, and semiconductor manufacturing.
Defined alongside the meter when France adopted the metric system in 1795, using the SI prefix micro- (from Greek mikros, "small") to denote one-millionth.
Micrometers are used to measure cell sizes, bacteria, semiconductor process nodes, fiber diameters, dust particles, and wavelengths of infrared radiation. The diameter of a human hair is about 70 μm.
Defined in 1795 as part of the original French metric system; the name "micron" was officially deprecated by the BIPM in 1967 in favor of micrometer.
Petameter
A petameter is a metric unit of length equal to one quadrillion meters (1×10¹⁵ m). It is rarely used in everyday or scientific contexts; astronomers prefer the light-year or parsec for these scales.
The petameter uses the SI prefix peta- (from Greek penta, five, by analogy with the exponent's relation to thousand-cubed-cubed), adopted by the CGPM in 1975 to denote 10¹⁵.
Petameters could express interstellar-scale distances but are almost never used in practice. A light-year is approximately 9.46 Pm; astronomy uses light-years and parsecs as standard.
SI prefix peta- adopted in 1975; the petameter is rarely used because astronomy has well-established non-SI units (light-year, parsec) for this scale.
Micrometer to Petameter conversion formula
The relationship between micrometers and petameters:
To convert micrometers to petameters, multiply the value in micrometers by 1e-21. To reverse, multiply petameters by 1e+21.
How to use this converter
Type a value into the calculator. The result in petameters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Petameter to Micrometer converter for the reverse direction.
Step-by-step: convert micrometers to petameters
- Write down the value in micrometers (μm).
- Multiply that value by the factor 1e-21.
- The product is the equivalent value in petameters (Pm).
- To reverse, multiply the petameter value by 1e+21.
Worked examples
Example 1 — Convert 1 μm to Pm:
1 × 1e-21 = 1e-21 Pm
Example 2 — Convert 100 μm to Pm:
100 × 1e-21 = 1e-19 Pm
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 micrometers), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 μm × 1e-21 = 3e-21 Pm
Real-world example — Plastic-film thickness alternates
A 150-micrometer plastic film converts cleanly to petameters — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 μm × 1e-21 = 1.5e-19 Pm
Real-world example — Hair-width scale measurements
A 70-micrometer measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like petameters for direct comparison across supplier datasheets.
70 μm × 1e-21 = 7e-20 Pm
Micrometer to Petameter conversion table
Standard reference values for converting micrometers to petameters:
| Micrometer [μm] | Petameter [Pm] |
|---|---|
| 0.01 | 1e-23 |
| 0.1 | 1e-22 |
| 1 | 1e-21 |
| 2 | 2e-21 |
| 3 | 3e-21 |
| 4 | 4e-21 |
| 5 | 5e-21 |
| 10 | 1e-20 |
| 20 | 2e-20 |
| 30 | 3e-20 |
| 40 | 4e-20 |
| 50 | 5e-20 |
| 100 | 1e-19 |
| 500 | 5e-19 |
| 1000 | 1e-18 |
Frequently asked questions
How many petameters is 1 micrometer?
How do I convert micrometers to petameters?
How do I convert petameters back to micrometers?
How many petameters is 100 micrometers?
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Sources & references
Conversion factor (1 μm = 1e-21 Pm) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.