R-134a PT Chart

R-134a saturation pressure, −40 to 150 °F−40 to 65 °C. Used in domestic refrigerators, vending, chillers and automotive A/C.

How to use ↓

Safety class A1Single component (HFC)No glideNo glide

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Step 1 Refrigerant

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Temperature Pressure

Step 3 Temperature

°F°C

Type a temperature to see the saturation pressure.

R-134a pressure temperature table

Below 0 psig: inches of mercury vacuum. Highlighted: 40 °F and 100 °F.Negative kPa = vacuum. Highlighted: 4 °C and 38 °C.

R-134a saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Pressure psig
-40	14.8 inHg
-39	14.4 inHg
-38	13.9 inHg
-37	13.4 inHg
-36	13.0 inHg
-35	12.5 inHg
-34	12.0 inHg
-33	11.4 inHg
-32	10.9 inHg
-31	10.4 inHg
-30	9.8 inHg
-29	9.3 inHg
-28	8.7 inHg
-27	8.1 inHg
-26	7.5 inHg
-25	6.9 inHg
-24	6.3 inHg
-23	5.7 inHg
-22	5.0 inHg
-21	4.3 inHg
-20	3.7 inHg
-19	3.0 inHg
-18	2.3 inHg
-17	1.5 inHg
-16	0.8 inHg
-15	0.1 inHg
-14	0.4
-13	0.7
-12	1.1
-11	1.5
-10	1.9
-9	2.4
-8	2.8
-7	3.2
-6	3.6
-5	4.1
-4	4.6
-3	5.0
-2	5.5
-1	6.0
0	6.5
1	7.0
2	7.5
3	8.0
4	8.5
5	9.1
6	9.6
7	10.2
8	10.8
9	11.3
10	11.9
11	12.5
12	13.1
13	13.8
14	14.4
15	15.0
16	15.7
17	16.4
18	17.0
19	17.7
20	18.4
21	19.1
22	19.9
23	20.6
24	21.3
25	22.1
26	22.9
27	23.7
28	24.5
29	25.3
30	26.1
31	26.9
32	27.8
33	28.6
34	29.5
35	30.4
36	31.3
37	32.2
38	33.1
39	34.1
40	35.0
41	36.0
42	37.0
43	38.0
44	39.0
45	40.1
46	41.1
47	42.2
48	43.2
49	44.3
50	45.4
51	46.6
52	47.7
53	48.9
54	50.0
55	51.2
56	52.4
57	53.6
58	54.9
59	56.1
60	57.4
61	58.7
62	60.0
63	61.3
64	62.7
65	64.0
66	65.4
67	66.8
68	68.2
69	69.7
70	71.1
71	72.6
72	74.1
73	75.6
74	77.1
75	78.7
76	80.2
77	81.8
78	83.4
79	85.0
80	86.7
81	88.4
82	90.0
83	91.8
84	93.5
85	95.2
86	97.0
87	98.8
88	100.6
89	102.5
90	104.3
91	106.2
92	108.1
93	110.0
94	112.0
95	113.9
96	115.9
97	118.0
98	120.0
99	122.1
100	124.2
101	126.3
102	128.4
103	130.6
104	132.7
105	135.0
106	137.2
107	139.5
108	141.7
109	144.0
110	146.4
111	148.7
112	151.1
113	153.5
114	156.0
115	158.4
116	160.9
117	163.4
118	166.0
119	168.6
120	171.2
121	173.8
122	176.5
123	179.1
124	181.8
125	184.6
126	187.4
127	190.1
128	193.0
129	195.8
130	198.7
131	201.6
132	204.6
133	207.5
134	210.6
135	213.6
136	216.7
137	219.7
138	222.9
139	226.0
140	229.2
141	232.4
142	235.7
143	239.0
144	242.3
145	245.7
146	249.0
147	252.5
148	255.9
149	259.4
150	262.9

R-134a saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Pressure kPa
-40	-50.1
-39	-47.4
-38	-44.5
-37	-41.5
-36	-38.4
-35	-35.2
-34	-31.8
-33	-28.3
-32	-24.7
-31	-20.9
-30	-16.9
-29	-12.9
-28	-8.6
-27	-4.2
-26	0.3
-25	5.1
-24	10.0
-23	15.1
-22	20.3
-21	25.8
-20	31.4
-19	37.2
-18	43.3
-17	49.5
-16	56.0
-15	62.6
-14	69.5
-13	76.6
-12	83.9
-11	91.5
-10	99.3
-9	107.3
-8	115.6
-7	124.2
-6	133.0
-5	142.0
-4	151.4
-3	161.0
-2	170.8
-1	181.0
0	191.5
1	202.2
2	213.3
3	224.7
4	236.3
5	248.3
6	260.7
7	273.3
8	286.3
9	299.6
10	313.3
11	327.3
12	341.7
13	356.4
14	371.6
15	387.0
16	402.9
17	419.2
18	435.9
19	452.9
20	470.4
21	488.3
22	506.6
23	525.3
24	544.5
25	564.1
26	584.1
27	604.6
28	625.6
29	647.0
30	668.9
31	691.2
32	714.1
33	737.5
34	761.3
35	785.7
36	810.5
37	835.9
38	861.8
39	888.3
40	915.3
41	942.8
42	970.9
43	999.6
44	1028.8
45	1058.6
46	1089.0
47	1120.0
48	1151.6
49	1183.8
50	1216.6
51	1250.0
52	1284.1
53	1318.8
54	1354.2
55	1390.2
56	1426.9
57	1464.2
58	1502.3
59	1541.0
60	1580.5
61	1620.6
62	1661.5
63	1703.1
64	1745.4
65	1788.5

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R-134a PT Chart

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

refrigerantptchart.com

°F	psig
-40	14.8"
-39	14.4"
-38	13.9"
-37	13.4"
-36	13.0"
-35	12.5"
-34	12.0"
-33	11.4"
-32	10.9"
-31	10.4"
-30	9.8"
-29	9.3"
-28	8.7"
-27	8.1"
-26	7.5"
-25	6.9"
-24	6.3"
-23	5.7"
-22	5.0"
-21	4.3"
-20	3.7"
-19	3.0"
-18	2.3"
-17	1.5"
-16	0.8"
-15	0.1"
-14	0.4
-13	0.7
-12	1.1
-11	1.5
-10	1.9
-9	2.4
-8	2.8
-7	3.2
-6	3.6
-5	4.1
-4	4.6
-3	5.0
-2	5.5
-1	6.0
0	6.5
1	7.0
2	7.5
3	8.0
4	8.5
5	9.1
6	9.6
7	10.2

°F	psig
8	10.8
9	11.3
10	11.9
11	12.5
12	13.1
13	13.8
14	14.4
15	15.0
16	15.7
17	16.4
18	17.0
19	17.7
20	18.4
21	19.1
22	19.9
23	20.6
24	21.3
25	22.1
26	22.9
27	23.7
28	24.5
29	25.3
30	26.1
31	26.9
32	27.8
33	28.6
34	29.5
35	30.4
36	31.3
37	32.2
38	33.1
39	34.1
40	35.0
41	36.0
42	37.0
43	38.0
44	39.0
45	40.1
46	41.1
47	42.2
48	43.2
49	44.3
50	45.4
51	46.6
52	47.7
53	48.9
54	50.0
55	51.2

°F	psig
56	52.4
57	53.6
58	54.9
59	56.1
60	57.4
61	58.7
62	60.0
63	61.3
64	62.7
65	64.0
66	65.4
67	66.8
68	68.2
69	69.7
70	71.1
71	72.6
72	74.1
73	75.6
74	77.1
75	78.7
76	80.2
77	81.8
78	83.4
79	85.0
80	86.7
81	88.4
82	90.0
83	91.8
84	93.5
85	95.2
86	97.0
87	98.8
88	100.6
89	102.5
90	104.3
91	106.2
92	108.1
93	110.0
94	112.0
95	113.9
96	115.9
97	118.0
98	120.0
99	122.1
100	124.2
101	126.3
102	128.4
103	130.6

°F	psig
104	132.7
105	135.0
106	137.2
107	139.5
108	141.7
109	144.0
110	146.4
111	148.7
112	151.1
113	153.5
114	156.0
115	158.4
116	160.9
117	163.4
118	166.0
119	168.6
120	171.2
121	173.8
122	176.5
123	179.1
124	181.8
125	184.6
126	187.4
127	190.1
128	193.0
129	195.8
130	198.7
131	201.6
132	204.6
133	207.5
134	210.6
135	213.6
136	216.7
137	219.7
138	222.9
139	226.0
140	229.2
141	232.4
142	235.7
143	239.0
144	242.3
145	245.7
146	249.0
147	252.5
148	255.9
149	259.4
150	262.9

Italic " = inches of mercury vacuum. Bold rows: 40 °F and 100 °F. Reference only: always verify with the manufacturer’s data and your gauges.

R-134a PT Chart

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

refrigerantptchart.com

°C	kPa
-40	-50.1
-39	-47.4
-38	-44.5
-37	-41.5
-36	-38.4
-35	-35.2
-34	-31.8
-33	-28.3
-32	-24.7
-31	-20.9
-30	-16.9
-29	-12.9
-28	-8.6
-27	-4.2
-26	0.3
-25	5.1
-24	10.0
-23	15.1
-22	20.3
-21	25.8
-20	31.4
-19	37.2
-18	43.3
-17	49.5
-16	56.0
-15	62.6
-14	69.5
-13	76.6
-12	83.9
-11	91.5
-10	99.3
-9	107.3
-8	115.6
-7	124.2
-6	133.0
-5	142.0

°C	kPa
-4	151.4
-3	161.0
-2	170.8
-1	181.0
0	191.5
1	202.2
2	213.3
3	224.7
4	236.3
5	248.3
6	260.7
7	273.3
8	286.3
9	299.6
10	313.3
11	327.3
12	341.7
13	356.4
14	371.6
15	387.0
16	402.9
17	419.2
18	435.9
19	452.9
20	470.4
21	488.3
22	506.6
23	525.3
24	544.5
25	564.1
26	584.1
27	604.6
28	625.6
29	647.0
30	668.9
31	691.2

°C	kPa
32	714.1
33	737.5
34	761.3
35	785.7
36	810.5
37	835.9
38	861.8
39	888.3
40	915.3
41	942.8
42	970.9
43	999.6
44	1028.8
45	1058.6
46	1089.0
47	1120.0
48	1151.6
49	1183.8
50	1216.6
51	1250.0
52	1284.1
53	1318.8
54	1354.2
55	1390.2
56	1426.9
57	1464.2
58	1502.3
59	1541.0
60	1580.5
61	1620.6
62	1661.5
63	1703.1
64	1745.4
65	1788.5

Negative kPa = vacuum. Bold rows: 4 °C and 38 °C. 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-134a chart

This R-134a pressure temperature chart gives the saturation pressure for every degree, in psig with °F or kPa (gauge) with °C. Below 0 psig the °F table shows inches of mercury (inHg) vacuum.

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

FAQ

What is the R-134a pressure at 40 °F?

35.0 psig at saturation, from the table above.

What is the R-134a pressure at 100 °F?

124.2 psig at saturation.

Does R-134a have glide?

No. R-134a is a single-component refrigerant, so one saturation pressure works for both superheat and subcooling.

R-134a PT Chart

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R-134a pressure temperature table

How to use

About this R-134a chart

FAQ

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