Barometer - Altitude Compensation

Elevation compensating manometer. Due to decreased/increased air pressure with increased/decreased altitude, barometric pressure readings at other elevations than sea level must be compensated.

Altitude (feet)	Altitude (meters)	Compensation (inches Hg)	Compensation (mm Hg)	Compensation (psia)	Compensation (kg/cm²)	Compensation (kPa)	Compensation (hPa)	Compensation (mBar)
-1000	-305	-1.1	-28	-0.5	-0.04	-4	-37	-37
-800	-244	-0.9	-22	-0.4	-0.03	-3	-30	-30
-600	-183	-0.7	-17	-0.3	-0.02	-2	-22	-22
-400	-122	-0.4	-11	-0.2	-0.02	-1	-15	-15
-200	-61	-0.2	-6	-0.1	-0.01	-1	-7	-7
0	0	0	0	0	0	0	0	0
200	61	0.2	6	0.1	0.01	1	7	7
400	122	0.4	11	0.2	0.015	1	15	15
600	183	0.6	16	0.3	0.022	2	22	22
800	244	0.9	22	0.4	0.03	3	29	29
1000	305	1.1	27	0.5	0.037	4	36	36
1200	366	1.3	33	0.6	0.044	4	43	43
1400	427	1.5	38	0.7	0.051	5	50	50
1600	488	1.7	43	0.8	0.058	6	57	57
1800	549	1.9	48	0.9	0.065	6	64	64
2000	610	2.1	54	1	0.073	7	71	71
2200	671	2.3	59	1.1	0.08	8	78	78
2400	732	2.5	64	1.2	0.087	8	85	85
2600	792	2.7	69	1.3	0.093	9	92	92
2800	853	2.9	74	1.4	0.1	10	98	98
3000	914	3.1	79	1.5	0.107	11	105	105
3200	975	3.3	84	1.62	0.114	11	112	112
3400	1036	3.5	89	1.72	0.121	12	118	118
3600	1097	3.7	94	1.81	0.128	13	125	125
3800	1158	3.89	99	1.91	0.134	13	132	132
4000	1219	4.08	104	2	0.141	14	138	138
4200	1280	4.27	109	2.1	0.148	14	145	145
4400	1341	4.46	114	2.19	0.154	15	151	151
4600	1402	4.65	118.9	2.28	0.161	16	157	157
4800	1463	4.84	123.7	2.38	0.167	16	164	164
5000	1524	5.03	128.5	2.47	0.174	17	170	170
5200	1585	5.21	133.2	2.56	0.18	18	176	176
5400	1646	5.4	138	2.65	0.186	18	183	183
5600	1707	5.58	142.6	2.74	0.193	19	189	189
5800	1768	5.76	147.3	2.83	0.199	20	195	195
6000	1829	5.94	151.9	2.92	0.205	20	201	201
6200	1890	6.12	156.6	3.01	0.212	21	207	207
6400	1951	6.3	161.1	3.09	0.218	21	213	213
6600	2012	6.48	165.7	3.18	0.224	22	219	219
6800	2073	6.66	170.2	3.27	0.23	23	225	225
7000	2134	6.83	174.7	3.36	0.236	23	231	231
7200	2195	7.01	179.2	3.44	0.242	24	237	237
7400	2256	7.18	183.6	3.53	0.248	24	243	243
7600	2316	7.35	188	3.61	0.254	25	249	249
7800	2377	7.53	192.4	3.7	0.26	25	255	255
8000	2438	7.7	196.8	3.78	0.266	26	261	261
8200	2499	7.87	201.1	3.86	0.272	27	266	266
8400	2560	8.03	205.4	3.94	0.278	27	272	272
8600	2621	8.2	209.7	4.03	0.283	28	278	278
8800	2682	8.37	213.9	4.11	0.289	28	283	283
9000	2743	8.53	218.2	4.19	0.295	29	289	289
9200	2804	8.7	222.4	4.27	0.3	29	295	295
9400	2865	8.86	226.5	4.35	0.306	30	300	300
9600	2926	9.02	230.7	4.43	0.312	31	306	306
9800	2987	9.18	234.8	4.51	0.317	31	311	311
10000	3048	9.34	238.9	4.59	0.323	32	316	316

Example - Barometer reading on the top of Ben Nevis mountain, Scotland

Ben Nevis in Scotland is 1344 m high. A barometer at this elevation must be added approximately 151 mBar to compensate for the difference in pressure from sea level.