R744 pressure–temperature chart
R744 (CO₂)
A1GWP (AR4) 1
Pressures are gauge, in bar (g): bar (a) minus 1.01325 bar.
CO₂ is transcritical above 31 °C / ~74 bar — saturation data covers the subcritical range only. Above the critical point there is no bubble/dew point; use gas-cooler outlet temperature instead.
Refrigerant Converter →| °C | Saturation pressure bar (g) |
|---|---|
| -50 | 5.81 |
| -49 | 6.09 |
| -48 | 6.38 |
| -47 | 6.68 |
| -46 | 6.99 |
| -45 | 7.31 |
| -44 | 7.63 |
| -43 | 7.97 |
| -42 | 8.31 |
| -41 | 8.67 |
| -40 | 9.03 |
| -39 | 9.41 |
| -38 | 9.79 |
| -37 | 10.19 |
| -36 | 10.59 |
| -35 | 11.01 |
| -34 | 11.44 |
| -33 | 11.88 |
| -32 | 12.33 |
| -31 | 12.79 |
| -30 | 13.26 |
| -29 | 13.75 |
| -28 | 14.25 |
| -27 | 14.76 |
| -26 | 15.28 |
| -25 | 15.81 |
| -24 | 16.36 |
| -23 | 16.92 |
| -22 | 17.50 |
| -21 | 18.08 |
| -20 | 18.68 |
| -19 | 19.30 |
| -18 | 19.93 |
| -17 | 20.57 |
| -16 | 21.22 |
| -15 | 21.89 |
| -14 | 22.58 |
| -13 | 23.28 |
| -12 | 24.00 |
| -11 | 24.73 |
| -10 | 25.47 |
| -9 | 26.24 |
| -8 | 27.01 |
| -7 | 27.81 |
| -6 | 28.62 |
| -5 | 29.45 |
| -4 | 30.29 |
| -3 | 31.15 |
| -2 | 32.03 |
| -1 | 32.92 |
| 0 | 33.84 |
| 1 | 34.77 |
| 2 | 35.72 |
| 3 | 36.69 |
| 4 | 37.68 |
| 5 | 38.68 |
| 6 | 39.71 |
| 7 | 40.75 |
| 8 | 41.82 |
| 9 | 42.90 |
| 10 | 44.01 |
| 11 | 45.14 |
| 12 | 46.28 |
| 13 | 47.45 |
| 14 | 48.64 |
| 15 | 49.86 |
| 16 | 51.09 |
| 17 | 52.35 |
| 18 | 53.64 |
| 19 | 54.95 |
| 20 | 56.28 |
| 21 | 57.63 |
| 22 | 59.02 |
| 23 | 60.43 |
| 24 | 61.86 |
| 25 | 63.33 |
| 26 | 64.82 |
| 27 | 66.35 |
| 28 | 67.90 |
Saturation data derived from reference equations of state. Always cross-check against calibrated gauges.