Gigatonnes of carbon to parts per million
Type a value in GtC to get it in ppm instantly.
131.8ppm
Nothing on our list is smaller: the last ice age is 1.4× higher.
Convert the other way: ppm to GtC
What it means
How much CO₂ is that?
Whole-atmosphere totals: 1 ppm = 2.124 GtC = 7.78 GtCO₂. About half of each year’s emissions stays in the air; oceans and land take the rest.
The math
How to convert GtC to ppm
To convert gigatonnes of carbon to parts per million, multiply by 0.47081.
Example: 280 GtC × 0.47081 = 131.827 ppm.
In the other direction, 1 ppm = 2.124 GtC.
Every unit
That CO₂ in every unit
Tables
GtC to ppm conversion table
| GtC | ppm |
|---|---|
| 1 GtC | 0.47081 ppm |
| 2 GtC | 0.94162 ppm |
| 5 GtC | 2.35405 ppm |
| 10 GtC | 4.7081 ppm |
| 50 GtC | 23.5405 ppm |
| 100 GtC | 47.081 ppm |
| 185 GtC | 87.0998 ppm |
| 280 GtC | 131.827 ppm |
| 315 GtC | 148.305 ppm |
| 350 GtC | 164.783 ppm |
| 400 GtC | 188.324 ppm |
| 424 GtC | 199.623 ppm |
| 450 GtC | 211.864 ppm |
| 500 GtC | 235.405 ppm |
| 560 GtC | 263.653 ppm |
ppm to GtC conversion table
| ppm | GtC |
|---|---|
| 1 ppm | 2.124 GtC |
| 2 ppm | 4.248 GtC |
| 5 ppm | 10.62 GtC |
| 10 ppm | 21.24 GtC |
| 50 ppm | 106.2 GtC |
| 100 ppm | 212.4 GtC |
| 185 ppm | 392.94 GtC |
| 280 ppm | 594.72 GtC |
| 315 ppm | 669.06 GtC |
| 350 ppm | 743.4 GtC |
| 400 ppm | 849.6 GtC |
| 424 ppm | 900.576 GtC |
| 450 ppm | 955.8 GtC |
| 500 ppm | 1,062 GtC |
| 560 ppm | 1,189.44 GtC |
Quick answers
Quick answers
- How many ppm is 1 GtC?
- 1 GtC is 0.47081 ppm.
- How many ppm is 10 GtC?
- 10 GtC is 4.7081 ppm.
- How many ppm is 280 GtC?
- 280 GtC is 131.827 ppm.
The units
About these units
Gigatonnes of carbon (GtC)
Billions of tonnes of carbon (PgC).
Parts per million (ppm)
Mixing ratio in the atmosphere.
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