Billions of years to millions of years
Type a value in Ga to get it in Ma instantly.
66,000Ma
That's 15× as old as the formation of Earth — nothing on our list beats it. On a calendar of Earth’s whole history, that is 5,306 days before the end.
Convert the other way: Ma to Ga
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 Ga to Ma
To convert billions of years to millions of years, multiply by 1,000.
Example: 66 Ga × 1,000 = 66,000 Ma.
In the other direction, 1 Ma = 0.001 Ga.
Every unit
Your age in every unit
Tables
Ga to Ma conversion table
| Ga | Ma |
|---|---|
| 0.01 Ga | 10 Ma |
| 0.1 Ga | 100 Ma |
| 1 Ga | 1,000 Ma |
| 2.6 Ga | 2,600 Ma |
| 23 Ga | 23,000 Ma |
| 66 Ga | 66,000 Ma |
| 145 Ga | 145,000 Ma |
| 252 Ga | 252,000 Ma |
| 541 Ga | 541,000 Ma |
| 1,000 Ga | 1,000,000 Ma |
| 2,500 Ga | 2,500,000 Ma |
| 4,540 Ga | 4,540,000 Ma |
Ma to Ga conversion table
| Ma | Ga |
|---|---|
| 0.01 Ma | 1×10⁻⁵ Ga |
| 0.1 Ma | 0.0001 Ga |
| 1 Ma | 0.001 Ga |
| 2.6 Ma | 0.0026 Ga |
| 23 Ma | 0.023 Ga |
| 66 Ma | 0.066 Ga |
| 145 Ma | 0.145 Ga |
| 252 Ma | 0.252 Ga |
| 541 Ma | 0.541 Ga |
| 1,000 Ma | 1 Ga |
| 2,500 Ma | 2.5 Ga |
| 4,540 Ma | 4.54 Ga |
Quick answers
Quick answers
- How many Ma is 1 Ga?
- 1 Ga is 1,000 Ma.
- How many Ma is 10 Ga?
- 10 Ga is 10,000 Ma.
- How many Ma is 66 Ga?
- 66 Ga is 66,000 Ma.
The units
About these units
Billions of years (Ga)
A billion years. The Earth formed 4.54 Ga ago.
Millions of years (Ma)
The geologist’s standard: a million years, used for most of the fossil record.
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