Water Properties: Vaporization Heat vs. Temperature Calculator

Calculate the latent heat of vaporization (∆Hvap) of water at saturation pressure for given temperatures. The calculator provides outputs in multiple units (kJ/mol, kJ/kg, kWh/kg, cal/g, Btu(IT)/mol, and Btu(IT)/lbm). Temperature range: 0-370°C, 32-700°F, 273-645 K, or 492-1160°R.

Calculator

Inputs

Temperature (°C)

Results

Heat of Vaporization-- kJ/mol

Heat of Vaporization-- kJ/kg

Heat of Vaporization-- kWh/kg

Heat of Vaporization-- cal/g

Heat of Vaporization-- Btu(IT)/mol

Heat of Vaporization-- Btu(IT)/lbm

Temperature (°C)	Vapor Pressure (kPa)	ΔHvap (J/mol)	ΔHvap (kJ/kg)	ΔHvap (Wh/kg)	ΔHvap (Btu(IT)/lbm)
0.01	0.61165	45054	2500.9	694.69	1075.2
2	0.70599	44970	2496.2	693.39	1073.2
4	0.81355	44883	2491.4	692.06	1071.1
10	1.2282	44627	2477.2	688.11	1065
14	1.599	44456	2467.7	685.47	1060.9
18	2.0647	44287	2458.3	682.86	1056.9
20	2.3393	44200	2453.5	681.53	1054.8
25	3.1699	43988	2441.7	678.25	1049.7
30	4.247	43774	2429.8	674.94	1044.6
34	5.3251	43602	2420.3	672.31	1040.5
40	7.3849	43345	2406	668.33	1034.4
44	9.1124	43172	2396.4	665.67	1030.3
50	12.352	42911	2381.9	661.64	1024
54	15.022	42738	2372.3	658.97	1019.9
60	19.946	42475	2357.7	654.92	1013.6
70	31.201	42030	2333	648.06	1003
80	47.414	41579	2308	641.11	992.26
90	70.182	41120	2282.5	634.03	981.3
96	87.771	40839	2266.9	629.69	974.59
100	101.42	40650	2256.4	626.78	970.08
110	143.38	40167	2229.6	619.33	958.56
120	198.67	39671	2202.1	611.69	946.73
140	361.54	38630	2144.3	595.64	921.88
160	618.23	37508	2082	578.33	895.1
180	1002.8	36286	2014.2	559.5	865.95
200	1554.9	34944	1939.7	538.81	833.92
220	2319.6	33462	1857.4	515.94	798.54
240	3346.9	31804	1765.4	490.39	758.99
260	4692.3	29934	1661.6	461.56	714.36
280	6416.6	27798	1543	428.61	663.37
300	8587.9	25304	1404.6	390.17	603.87
320	11284	22310	1238.4	344	532.42
340	14601	18507	1027.3	285.36	441.66
360	18666	12967	719.8	199.9	309.5
373.946	22064	0	0	0	0