KV SoftwarePT charts / R-404A
R-404A PT chart
Saturation pressure and temperature for R-404A, from -40 to 150 °F in 2 °F steps, in psig at sea level.
R-404A is R-125 / R-143a / R-134a (44/52/4 wt). It is a near-azeotropic blend with about 0.9 °F of glide, so bubble and dew pressure differ. ASHRAE 34 safety class A1, lower toxicity and no flame propagation.
Superheat and subcooling calculator
Type what your gauges and clamp read for R-404A. Superheat uses the dew point, subcooling uses the bubble point.
Superheat
Enter the suction pressure.
Subcooling
Enter the liquid pressure.
R-404A pressure temperature chart
| Temp °F | Bubble psig | Dew psig |
|---|---|---|
| -40 | 4.9 | 4.3 |
| -38 | 5.9 | 5.3 |
| -36 | 7.0 | 6.3 |
| -34 | 8.0 | 7.4 |
| -32 | 9.2 | 8.5 |
| -30 | 10.3 | 9.6 |
| -28 | 11.5 | 10.8 |
| -26 | 12.8 | 12.0 |
| -24 | 14.1 | 13.3 |
| -22 | 15.4 | 14.6 |
| -20 | 16.8 | 16.0 |
| -18 | 18.3 | 17.4 |
| -16 | 19.8 | 18.9 |
| -14 | 21.3 | 20.4 |
| -12 | 22.9 | 22.0 |
| -10 | 24.6 | 23.6 |
| -8 | 26.3 | 25.3 |
| -6 | 28.0 | 27.0 |
| -4 | 29.8 | 28.8 |
| -2 | 31.7 | 30.7 |
| 0 | 33.7 | 32.6 |
| 2 | 35.7 | 34.6 |
| 4 | 37.7 | 36.6 |
| 6 | 39.8 | 38.7 |
| 8 | 42.0 | 40.9 |
| 10 | 44.3 | 43.1 |
| 12 | 46.6 | 45.4 |
| 14 | 49.0 | 47.8 |
| 16 | 51.5 | 50.2 |
| 18 | 54.0 | 52.7 |
| 20 | 56.6 | 55.3 |
| 22 | 59.3 | 57.9 |
| 24 | 62.0 | 60.7 |
| 26 | 64.8 | 63.5 |
| 28 | 67.8 | 66.4 |
| 30 | 70.7 | 69.3 |
| 32 | 73.8 | 72.4 |
| 34 | 77.0 | 75.5 |
| 36 | 80.2 | 78.7 |
| 38 | 83.5 | 82.0 |
| 40 | 86.9 | 85.4 |
| 42 | 90.4 | 88.8 |
| 44 | 94.0 | 92.4 |
| 46 | 97.6 | 96.0 |
| 48 | 101.4 | 99.8 |
| 50 | 105.3 | 103.6 |
| 52 | 109.2 | 107.5 |
| 54 | 113.3 | 111.6 |
| 56 | 117.4 | 115.7 |
| 58 | 121.7 | 119.9 |
| 60 | 126.0 | 124.2 |
| 62 | 130.4 | 128.7 |
| 64 | 135.0 | 133.2 |
| 66 | 139.7 | 137.8 |
| 68 | 144.4 | 142.6 |
| 70 | 149.3 | 147.4 |
| 72 | 154.3 | 152.4 |
| 74 | 159.4 | 157.5 |
| 76 | 164.6 | 162.7 |
| 78 | 169.9 | 168.0 |
| 80 | 175.4 | 173.4 |
| 82 | 181.0 | 179.0 |
| 84 | 186.7 | 184.7 |
| 86 | 192.5 | 190.5 |
| 88 | 198.4 | 196.4 |
| 90 | 204.5 | 202.4 |
| 92 | 210.7 | 208.6 |
| 94 | 217.0 | 214.9 |
| 96 | 223.5 | 221.4 |
| 98 | 230.0 | 228.0 |
| 100 | 236.8 | 234.7 |
| 102 | 243.6 | 241.5 |
| 104 | 250.7 | 248.5 |
| 106 | 257.8 | 255.7 |
| 108 | 265.1 | 263.0 |
| 110 | 272.6 | 270.4 |
| 112 | 280.2 | 278.0 |
| 114 | 287.9 | 285.8 |
| 116 | 295.8 | 293.7 |
| 118 | 303.9 | 301.7 |
| 120 | 312.1 | 309.9 |
| 122 | 320.5 | 318.3 |
| 124 | 329.0 | 326.9 |
| 126 | 337.7 | 335.6 |
| 128 | 346.6 | 344.5 |
| 130 | 355.7 | 353.6 |
| 132 | 364.9 | 362.8 |
| 134 | 374.3 | 372.3 |
| 136 | 384.0 | 381.9 |
| 138 | 393.7 | 391.7 |
| 140 | 403.7 | 401.7 |
| 142 | 413.9 | 412.0 |
| 144 | 424.3 | 422.4 |
| 146 | 434.9 | 433.0 |
| 148 | 445.7 | 443.9 |
| 150 | 456.8 | 455.0 |
Saturon
All 9 refrigerants on your iPhone, offline in the attic. Superheat, subcooling, target superheat, airflow. $7.99 once.
Other refrigerants
- R-410A PT chart
- R-22 PT chart
- R-454B PT chart
- R-32 PT chart
- R-404A
- R-134a PT chart
- R-407C PT chart
- R-454C PT chart
- R-290 PT chart
Data: NIST REFPROP-lineage Helmholtz EOS via CoolProp 7.2.0; A2L blends cross-checked vs OEM (Chemours Opteon) glide/pressure anchors. Data version 2026.06.1, pressures in psig at standard sea level (14.696 psia). Reference aid, not a substitute for the manufacturer charging chart. Verify against the equipment nameplate. Published 24 October 2026 by Karolis Valatka, who makes Saturon.