Boiling Points

Important!

The only actual factor which is truly involved in the variance of boiling water is the pressure. Altitude is given as an alternative when pressure is not available. The boiling point of this calculator begins to lose accuracy at extreme values and also due to rounding.

Boiling Point of Water

By pressure By local altitude

Enter pressure.

Enter local altitude. (0 = sea level)

Boiling Point

Vacuum below atmosphere

Pressure

Boiling Point of Water at Various Vacuum Levels

Temperature (°F)	Temperature (°C)	Microns	Pressure (inHg vacuum)	Pressure (psia)
212	100	759968	0.00	14.696
205	96.11	535000	4.92	12.279
194	90	525526	9.23	10.162
176	80	355092	15.94	6.866
158	70	233680	20.72	4.519
140	60	149352	24.04	2.888
122	50	92456	26.28	1.788
104	40	55118	27.75	1.066
86	30	31750	28.67	0.614
80	26.67	25400	28.92	0.491
76	24.44	22860	29.02	0.442
72	22.22	20320	29.12	0.393
69	20.56	17780	29.22	0.344
64	17.78	15240	29.32	0.295
59	15	12700	29.42	0.246
53	11.67	10160	29.52	0.196
45	7.22	7620	29.62	0.147
32	0	4572	29.74	0.088
21	-6.11	2540	29.82	0.049
6	-14.44	1270	29.87	0.0245
-24	-31.11	254	29.91	0.0049
-35	-37.22	127	29.9150	0.00245
-60	-51.11	25.40	29.9190	0.00049
-70	-56.67	12.70	29.9195	0.00024
-90	-67.78	2.54	29.9199	0.00005
--	--	0.00	29.9200	0.000000

Boiling point is not valid. Pressure cannot be zero. (i.e., perfect vacuum)
Boiling point is not valid. Pressure at the given altitude is non-existent.