This table is derived from the NASA atmospheric model. Please note that altitude in this table is above mean sea level (amsl) and assumes the standard atmosphere (amongst other things that the sea level pressure is 1013.25 hPa). As this is what is assumed in the NOAA soundings computer model, the two are compatible.
For full details on the function used to calculate this table, see this pdf.
| Press (hPa) | Alt (ft) | Press (hPa) | Alt (ft) |
| 1013 | 0 | 706 | 10,000 |
| 995 | 500 | 693 | 10,500 |
| 977 | 1,000 | 681 | 11,000 |
| 960 | 1,500 | 668 | 11,500 |
| 943 | 2,000 | 656 | 12,000 |
| 926 | 2,500 | 645 | 12,500 |
| 909 | 3,000 | 633 | 13,000 |
| 893 | 3,500 | 622 | 13,500 |
| 877 | 4,000 | 611 | 14,000 |
| 861 | 4,500 | 600 | 14,500 |
| 846 | 5,000 | 589 | 15,000 |
| 830 | 5,500 | 578 | 15,500 |
| 816 | 6,000 | 568 | 16,000 |
| 801 | 6,500 | 558 | 16,500 |
| 787 | 7,000 | 548 | 17,000 |
| 772 | 7,500 | 538 | 17,500 |
| 759 | 8,000 | 528 | 18,000 |
| 745 | 8,500 | 519 | 18,500 |
| 732 | 9,000 | 510 | 19,000 |
| 719 | 9,500 | 500 | 19,500 |
| 491 | 20,000 |