Convert Megameter to Micron
Convert megameters to microns instantly. 1 megameter = 1e+12 micron — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Micron to Megameter converter for the reverse conversion.
Units explained
Megameter
A megameter is a metric unit of length equal to one million meters (1×10⁶ m, or 1,000 km). It is occasionally used in geophysics and astronomy when expressing planetary-scale distances in SI units.
The megameter uses the SI prefix mega- (from Greek megas, great), adopted by the CGPM in 1960 to denote multiplication by one million.
Megameters appear in geophysics (Earth's mean radius is 6.371 Mm), planetary science, and large-scale civil engineering planning. The unit is less common than the kilometer for everyday geographic distances.
SI prefix mega- adopted in 1960; the megameter is the standard SI prefix unit for distances comparable to planetary radii.
Micron
A micron is a deprecated synonym for the micrometer (1×10⁻⁶ m). Although officially obsolete since 1967, the term remains in widespread informal use in microscopy, biology, materials science, and industrial filtration.
The term micron was coined in 1879 by the BIPM as a unit name for one millionth of a meter. It was officially deprecated in 1967 in favor of the SI-compliant name micrometer to avoid confusion with the device (also called a micrometer) used for precise mechanical measurement.
Microns are used informally in filtration ratings (e.g., a 5-micron water filter), industrial coatings, microscopy specifications, and pharmaceutical particle-size descriptions. The conversion to micrometers is exact: 1 micron = 1 µm = 1×10⁻⁶ m.
Introduced in 1879, deprecated by the BIPM in 1967, but retained in informal industrial and scientific usage well into the 21st century.
Megameter to Micron conversion formula
The relationship between megameters and microns:
To convert megameters to microns, multiply the value in megameters by 1e+12. To reverse, multiply microns by 1e-12.
How to use this converter
Type a value into the calculator. The result in microns updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Micron to Megameter converter for the reverse direction.
Step-by-step: convert megameters to microns
- Write down the value in megameters (Mm).
- Multiply that value by the factor 1e+12.
- The product is the equivalent value in microns (micron).
- To reverse, multiply the micron value by 1e-12.
Worked examples
Example 1 — Convert 1 Mm to micron:
1 × 1e+12 = 1e+12 micron
Example 2 — Convert 100 Mm to micron:
100 × 1e+12 = 1e+14 micron
Megameter to Micron conversion table
Standard reference values for converting megameters to microns:
| Megameter [Mm] | Micron [micron] |
|---|---|
| 0.01 | 1e+10 |
| 0.1 | 1e+11 |
| 1 | 1e+12 |
| 2 | 2e+12 |
| 3 | 3e+12 |
| 4 | 4e+12 |
| 5 | 5e+12 |
| 10 | 1e+13 |
| 20 | 2e+13 |
| 30 | 3e+13 |
| 40 | 4e+13 |
| 50 | 5e+13 |
| 100 | 1e+14 |
| 500 | 5e+14 |
| 1000 | 1e+15 |
Frequently asked questions
How many microns is 1 megameter?
How do I convert megameters to microns?
How do I convert microns back to megameters?
How many microns is 100 megameters?
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Sources & references
Conversion factor (1 Mm = 1e+12 micron) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.