Years to millions of years
Type a value in yr to get it in Ma instantly.
6.6×10⁻⁵Ma
Nothing on our list is smaller: the end of the last ice age is 174× older. On a calendar of Earth’s whole history, that is 5.306×10⁻⁶ days before the end.
Convert the other way: Ma to yr
What it means
How long ago is that?
Dates follow the International Commission on Stratigraphy. Boundaries shift a little as dating methods improve.
The math
How to convert yr to Ma
To convert years to millions of years, multiply by 1×10⁻⁶.
Example: 66 yr × 1×10⁻⁶ = 6.6×10⁻⁵ Ma.
In the other direction, 1 Ma = 1,000,000 yr.
Every unit
Your age in every unit
Tables
yr to Ma conversion table
| yr | Ma |
|---|---|
| 0.01 yr | 1×10⁻⁸ Ma |
| 0.1 yr | 1×10⁻⁷ Ma |
| 1 yr | 1×10⁻⁶ Ma |
| 2.6 yr | 2.6×10⁻⁶ Ma |
| 23 yr | 2.3×10⁻⁵ Ma |
| 66 yr | 6.6×10⁻⁵ Ma |
| 145 yr | 0.000145 Ma |
| 252 yr | 0.000252 Ma |
| 541 yr | 0.000541 Ma |
| 1,000 yr | 0.001 Ma |
| 2,500 yr | 0.0025 Ma |
| 4,540 yr | 0.00454 Ma |
Ma to yr conversion table
| Ma | yr |
|---|---|
| 0.01 Ma | 10,000 yr |
| 0.1 Ma | 100,000 yr |
| 1 Ma | 1,000,000 yr |
| 2.6 Ma | 2,600,000 yr |
| 23 Ma | 23,000,000 yr |
| 66 Ma | 66,000,000 yr |
| 145 Ma | 145,000,000 yr |
| 252 Ma | 252,000,000 yr |
| 541 Ma | 541,000,000 yr |
| 1,000 Ma | 1×10⁹ yr |
| 2,500 Ma | 2.5×10⁹ yr |
| 4,540 Ma | 4.54×10⁹ yr |
Quick answers
Quick answers
- How many Ma is 1 yr?
- 1 yr is 1×10⁻⁶ Ma.
- How many Ma is 10 yr?
- 10 yr is 1×10⁻⁵ Ma.
- How many Ma is 66 yr?
- 66 yr is 6.6×10⁻⁵ Ma.
The units
About these units
Years (yr)
Ordinary calendar years, for the human end of the scale.
Millions of years (Ma)
The geologist’s standard: a million years, used for most of the fossil record.
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