Vacuum unit conversion table with common pressure measurements.
% Vacuum(%)	Torr (mm Mercury)(mmHg)	Micron(μmHg)	psia (lb/in² abs)(psi)	Inches Hg Absolute(inHg)	Inches Hg Gauge(inHg)	kPa Absolute(kPa)
0	760	760000	14.7	29.92	0	101.4
1.3	750	750000	14.5	29.5	0.42	99.9
1.9	735.6	735600	14.2	28.9	1.02	97.7
7.9	700	700000	13.5	27.6	2.32	93.5
21	600	600000	11.6	23.6	6.32	79.9
34	500	500000	9.7	19.7	10.22	66.7
47	400	400000	7.7	15.7	14.22	53.2
50	380	380000	7.3	15	14.92	50.8
61	300	300000	5.8	11.8	18.12	40
74	200	200000	3.9	7.85	22.07	26.6
87	100	100000	1.93	3.94	25.98	13.3
88	90	90000	1.74	3.54	26.38	12
89.5	80	80000	1.55	3.15	26.77	10.7
90.8	70	70000	1.35	2.76	27.16	9.3
92.1	60	60000	1.16	2.36	27.56	8
93	51.7	51700	1	2.03	27.89	6.9
93.5	50	50000	0.97	1.97	27.95	6.7
94.8	40	40000	0.77	1.57	28.35	5.3
96.1	30	30000	0.58	1.18	28.74	4
96.6	25.4	25400	0.49	1	28.92	3.4
97.4	20	20000	0.39	0.785	29.14	2.7
98.7	10	10000	0.193	0.394	29.53	1.3
99	7.6	7600	0.147	0.299	29.62	1
99.87	1	1000	0.01934	0.03937	29.88	0.13
99.9	0.75	750	0.0145	0.0295	29.89	0.1
99.99	0.1	100	0.00193	0.00394	29.916	0.013
99.999	0.01	10	0.000193	0.000394	29.9196	0.0013
100	0	0	0	29.92	0	0

Source: engineeringtoolbox.com

Vacuum Classification Ranges

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