Find your elevation and find the corresponding atmospheric pressure in the table below. If you don’t find the exact elevation you need, you may interpolate between the values that span your desired elevation.
A detailed database of elevations is available at the USGS website.
| Elev(ft) | PSIA | “HgA |
|---|---|---|
| 0 | 14.70 | 29.92 |
| 100 | 14.64 | 29.81 |
| 200 | 14.59 | 29.70 |
| 300 | 14.53 | 29.60 |
| 400 | 14.48 | 29.49 |
| 500 | 14.42 | 29.38 |
| 600 | 14.37 | 29.28 |
| 700 | 14.32 | 29.17 |
| 800 | 14.26 | 29.07 |
| 900 | 14.21 | 28.96 |
| 1000 | 14.16 | 28.86 |
| 1100 | 14.11 | 28.75 |
| 1200 | 14.06 | 28.65 |
| 1300 | 14.01 | 28.54 |
| 1400 | 13.96 | 28.44 |
| 1500 | 13.91 | 28.33 |
| 1600 | 13.86 | 28.23 |
| 1700 | 13.81 | 28.13 |
| 1800 | 13.76 | 28.02 |
| 1900 | 13.71 | 27.92 |
| 2000 | 13.66 | 27.82 |
| 2100 | 13.61 | 27.72 |
| Elev(ft) | PSIA | “HgA |
|---|---|---|
| 2200 | 13.56 | 27.62 |
| 2300 | 13.51 | 27.51 |
| 2400 | 13.46 | 27.41 |
| 2500 | 13.41 | 27.31 |
| 2600 | 13.36 | 27.21 |
| 2700 | 13.31 | 27.11 |
| 2800 | 13.26 | 27.01 |
| 2900 | 13.21 | 26.91 |
| 3000 | 13.16 | 26.81 |
| 3100 | 13.11 | 26.71 |
| 3200 | 13.06 | 26.61 |
| 3300 | 13.02 | 26.52 |
| 3400 | 12.97 | 26.42 |
| 3500 | 12.92 | 26.32 |
| 3600 | 12.87 | 26.22 |
| 3700 | 12.82 | 26.13 |
| 3800 | 12.78 | 26.03 |
| 3900 | 12.73 | 25.94 |
| 4000 | 12.68 | 25.84 |
| 4100 | 12.63 | 25.74 |
| 4200 | 12.59 | 25.65 |
| 4300 | 12.54 | 25.55 |
| Elev(ft) | PSIA | “HgA |
|---|---|---|
| 4400 | 12.5 | 25.46 |
| 4500 | 12.45 | 25.36 |
| 4600 | 12.4 | 25.27 |
| 4700 | 12.36 | 25.17 |
| 4800 | 12.31 | 25.08 |
| 4900 | 12.27 | 24.98 |
| 5000 | 12.22 | 24.89 |
| 5100 | 12.17 | 24.8 |
| 5200 | 12.13 | 24.71 |
| 5300 | 12.08 | 24.61 |
| 5400 | 12.04 | 24.52 |
| 5500 | 11.99 | 24.43 |
| 5600 | 11.95 | 24.34 |
| 5700 | 11.9 | 24.25 |
| 5800 | 11.86 | 24.16 |
| 5900 | 11.81 | 24.07 |
| 6000 | 11.77 | 23.98 |
| 7000 | 11.33 | 23.09 |
| 8000 | 10.91 | 22.22 |
| 9000 | 10.5 | 21.38 |
| 10000 | 10.1 | 20.58 |
| 11000 | 9.71 | 19.75 |
Calculation Method to convert SCFM (Standard Cubic Feet per Minute) to ACFM (Actual Cubic Feet per Minute). The calculation is based on standard conditions of 68°F, 36% relative humidity (RH) and 14.7 PSIA.
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