R-744 PT Chart

R-744 saturation pressure, −60 to 87 °F−50 to 30 °C. Used in CO2 transcritical and cascade refrigeration.

How to use ↓

Safety class A1Single component (natural)No glideNo glide

PT lookup

Step 1 Refrigerant

Step 2 I know the

Temperature Pressure

Step 3 Temperature

°F°C

Type a temperature to see the saturation pressure.

R-744 pressure temperature table

Highlighted: 40 °F and 100 °F.Negative kPa = vacuum. Highlighted: 4 °C and 38 °C.

The table stops just below the critical point (87.76 °F / 30.98 °C, 1055 psig). Above it there is no saturation pressure.

R-744 saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Pressure psig
-60	79.9
-59	82.1
-58	84.3
-57	86.5
-56	88.8
-55	91.1
-54	93.5
-53	95.9
-52	98.4
-51	100.9
-50	103.4
-49	106.0
-48	108.6
-47	111.2
-46	113.9
-45	116.6
-44	119.4
-43	122.3
-42	125.1
-41	128.0
-40	131.0
-39	134.0
-38	137.0
-37	140.1
-36	143.3
-35	146.5
-34	149.7
-33	153.0
-32	156.3
-31	159.7
-30	163.1
-29	166.6
-28	170.1
-27	173.7
-26	177.3
-25	181.0
-24	184.8
-23	188.5
-22	192.4
-21	196.3
-20	200.2
-19	204.2
-18	208.3
-17	212.4
-16	216.5
-15	220.8
-14	225.0
-13	229.4
-12	233.8
-11	238.2
-10	242.7
-9	247.3
-8	251.9
-7	256.6
-6	261.3
-5	266.1
-4	271.0
-3	275.9
-2	280.9
-1	285.9
0	291.0
1	296.2
2	301.5
3	306.8
4	312.1
5	317.6
6	323.1
7	328.6
8	334.2
9	339.9
10	345.7
11	351.5
12	357.4
13	363.4
14	369.5
15	375.6
16	381.8
17	388.0
18	394.3
19	400.7
20	407.2
21	413.8
22	420.4
23	427.1
24	433.8
25	440.7
26	447.6
27	454.6
28	461.7
29	468.8
30	476.1
31	483.4
32	490.8
33	498.3
34	505.8
35	513.4
36	521.2
37	529.0
38	536.9
39	544.8
40	552.9
41	561.0
42	569.3
43	577.6
44	586.0
45	594.5
46	603.1
47	611.7
48	620.5
49	629.3
50	638.3
51	647.3
52	656.5
53	665.7
54	675.0
55	684.4
56	694.0
57	703.6
58	713.3
59	723.1
60	733.1
61	743.1
62	753.2
63	763.4
64	773.8
65	784.2
66	794.8
67	805.5
68	816.2
69	827.1
70	838.1
71	849.2
72	860.5
73	871.8
74	883.3
75	894.9
76	906.7
77	918.5
78	930.5
79	942.6
80	954.9
81	967.3
82	979.8
83	992.5
84	1005.4
85	1018.4
86	1031.6
87	1044.9

R-744 saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Pressure kPa
-50	581.0
-49	609.2
-48	638.2
-47	668.0
-46	698.8
-45	730.5
-44	763.1
-43	796.7
-42	831.2
-41	866.7
-40	903.2
-39	940.7
-38	979.2
-37	1018.8
-36	1059.4
-35	1101.1
-34	1143.9
-33	1187.8
-32	1232.9
-31	1279.1
-30	1326.4
-29	1375.0
-28	1424.7
-27	1475.7
-26	1527.9
-25	1581.4
-24	1636.2
-23	1692.2
-22	1749.6
-21	1808.3
-20	1868.3
-19	1929.7
-18	1992.5
-17	2056.7
-16	2122.4
-15	2189.5
-14	2258.0
-13	2328.1
-12	2399.6
-11	2472.7
-10	2547.4
-9	2623.6
-8	2701.4
-7	2780.8
-6	2861.8
-5	2944.6
-4	3028.9
-3	3115.0
-2	3202.9
-1	3292.5
0	3383.8
1	3477.0
2	3572.0
3	3668.8
4	3767.5
5	3868.1
6	3970.7
7	4075.2
8	4181.7
9	4290.3
10	4400.9
11	4513.5
12	4628.3
13	4745.3
14	4864.4
15	4985.8
16	5109.5
17	5235.4
18	5363.8
19	5494.5
20	5627.7
21	5763.5
22	5901.8
23	6042.7
24	6186.4
25	6332.9
26	6482.4
27	6634.8
28	6790.5
29	6949.6
30	7112.4

Back to the lookup ↑

R-744 PT Chart

°F / psig · Safety class A1 · Single component (natural)

refrigerantptchart.com

°F	psig
-60	79.9
-59	82.1
-58	84.3
-57	86.5
-56	88.8
-55	91.1
-54	93.5
-53	95.9
-52	98.4
-51	100.9
-50	103.4
-49	106.0
-48	108.6
-47	111.2
-46	113.9
-45	116.6
-44	119.4
-43	122.3
-42	125.1
-41	128.0
-40	131.0
-39	134.0
-38	137.0
-37	140.1
-36	143.3
-35	146.5
-34	149.7
-33	153.0
-32	156.3
-31	159.7
-30	163.1
-29	166.6
-28	170.1
-27	173.7
-26	177.3
-25	181.0
-24	184.8

°F	psig
-23	188.5
-22	192.4
-21	196.3
-20	200.2
-19	204.2
-18	208.3
-17	212.4
-16	216.5
-15	220.8
-14	225.0
-13	229.4
-12	233.8
-11	238.2
-10	242.7
-9	247.3
-8	251.9
-7	256.6
-6	261.3
-5	266.1
-4	271.0
-3	275.9
-2	280.9
-1	285.9
0	291.0
1	296.2
2	301.5
3	306.8
4	312.1
5	317.6
6	323.1
7	328.6
8	334.2
9	339.9
10	345.7
11	351.5
12	357.4
13	363.4

°F	psig
14	369.5
15	375.6
16	381.8
17	388.0
18	394.3
19	400.7
20	407.2
21	413.8
22	420.4
23	427.1
24	433.8
25	440.7
26	447.6
27	454.6
28	461.7
29	468.8
30	476.1
31	483.4
32	490.8
33	498.3
34	505.8
35	513.4
36	521.2
37	529.0
38	536.9
39	544.8
40	552.9
41	561.0
42	569.3
43	577.6
44	586.0
45	594.5
46	603.1
47	611.7
48	620.5
49	629.3
50	638.3

°F	psig
51	647.3
52	656.5
53	665.7
54	675.0
55	684.4
56	694.0
57	703.6
58	713.3
59	723.1
60	733.1
61	743.1
62	753.2
63	763.4
64	773.8
65	784.2
66	794.8
67	805.5
68	816.2
69	827.1
70	838.1
71	849.2
72	860.5
73	871.8
74	883.3
75	894.9
76	906.7
77	918.5
78	930.5
79	942.6
80	954.9
81	967.3
82	979.8
83	992.5
84	1005.4
85	1018.4
86	1031.6
87	1044.9

Bold rows: 40 °F and 100 °F. Table stops below the critical point. Reference only: always verify with the manufacturer’s data and your gauges.

R-744 PT Chart

°C / kPa (gauge) · Safety class A1 · Single component (natural)

refrigerantptchart.com

°C	kPa
-50	581.0
-49	609.2
-48	638.2
-47	668.0
-46	698.8
-45	730.5
-44	763.1
-43	796.7
-42	831.2
-41	866.7
-40	903.2
-39	940.7
-38	979.2
-37	1018.8
-36	1059.4
-35	1101.1
-34	1143.9
-33	1187.8
-32	1232.9
-31	1279.1
-30	1326.4
-29	1375.0
-28	1424.7
-27	1475.7
-26	1527.9
-25	1581.4
-24	1636.2

°C	kPa
-23	1692.2
-22	1749.6
-21	1808.3
-20	1868.3
-19	1929.7
-18	1992.5
-17	2056.7
-16	2122.4
-15	2189.5
-14	2258.0
-13	2328.1
-12	2399.6
-11	2472.7
-10	2547.4
-9	2623.6
-8	2701.4
-7	2780.8
-6	2861.8
-5	2944.6
-4	3028.9
-3	3115.0
-2	3202.9
-1	3292.5
0	3383.8
1	3477.0
2	3572.0
3	3668.8

°C	kPa
4	3767.5
5	3868.1
6	3970.7
7	4075.2
8	4181.7
9	4290.3
10	4400.9
11	4513.5
12	4628.3
13	4745.3
14	4864.4
15	4985.8
16	5109.5
17	5235.4
18	5363.8
19	5494.5
20	5627.7
21	5763.5
22	5901.8
23	6042.7
24	6186.4
25	6332.9
26	6482.4
27	6634.8
28	6790.5
29	6949.6
30	7112.4

Bold rows: 4 °C and 38 °C. Table stops below the critical point. Reference only: always verify with the manufacturer’s data and your gauges.

How to use

Choose Temperature or Pressure and type the number. The answer shows straight away.
Blends show two values: use vapor (dew) for superheat and liquid (bubble) for subcooling.
Tap °C · kPa for metric. Below 0 psig, pressure is in inches of mercury (inHg) vacuum.
Press Print pocket chart for a one-page chart (Letter or A4) for the van or the tool bag.

About this R-744 chart

This R-744 pressure temperature chart gives the saturation pressure for every degree, in psig with °F or kPa (gauge) with °C.

Source: supplier chart (A-Gas), checked against NIST. Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-744 pressure at 40 °F?

552.9 psig at saturation, from the table above.

Why does the R-744 table stop at 87 °F?

The table stops just below the critical point (87.76 °F / 30.98 °C, 1055 psig). Above it there is no saturation pressure.

Does R-744 have glide?

No. R-744 is a single-component refrigerant, so one saturation pressure works for both superheat and subcooling.

R-744 PT Chart

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R-744 pressure temperature table

How to use

About this R-744 chart

FAQ

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