NWP | Pressure Altitude Calculator
Pressure Altitude Calculator
Pressure Altitude
From the user, a station pressure (\(P_{sta}\)) is given. To calculate the pressure altitude, the station pressure must be in units of millibars (mb). To see how to convert station pressure to millibars see the link below: Pressure Conversion Then, the pressure altitude (\(h_{alt}\)) can be calculated using the equation below:
\[ h_{alt} = \left(1 - \left(\frac{P_{sta}}{1013.25}\right)^{0.190284}\right) × 145366.45 \]
The answer will be in units of feet. To convert the answer to units of meters, see the equation below:
\[ hm = 0.3048 × h_{alt} \]
常用的標準大氣內主要物理參數 (氣壓, 海拔高度)
| 氣壓 (hPa) | 飛行空層 (Flight level) | 溫度 (°C) | 空氣密度 (kg/m³) | 平均海拔高度 (呎) | 平均海拔高度 (米) |
|---|---|---|---|---|---|
| 1013 | 15 | 1.225 | 平均海平面 | 平均海平面 | |
| 1000 | 14 | 1.212 | 364 | 110 | |
| 950 | 12 | 1.163 | 1773 | 540 | |
| 900 | 9 | 1.113 | 3243 | 988 | |
| 850 | 6 | 1.063 | 4781 | 1457 | |
| 800 | 2 | 1.012 | 6394 | 1949 | |
| 750 | -1 | 0.960 | 8091 | 2466 | |
| 700 | FL100 | -5 | 0.908 | 9882 | 3012 |
| 650 | -8 | 0.855 | 11780 | 3591 | |
| 600 | FL140 | -12 | 0.802 | 13801 | 4207 |
| 550 | -17 | 0.747 | 15962 | 4866 | |
| 500 | FL185 | -21 | 0.692 | 18289 | 5575 |
| 450 | -26 | 0.635 | 20812 | 6345 | |
| 400 | FL235 | -32 | 0.577 | 23574 | 7187 |
| 350 | -38 | 0.518 | 26631 | 8119 | |
| 300 | FL300 | -45 | 0.467 | 30065 | 9166 |
| 250 | FL340 | -51 | 0.395 | 33999 | 10365 |
| 200 | FL385 | -55 | 0.322 | 38936 | 11787 |
| 150 | FL445 | -57 | 0.241 | 44647 | 13611 |
| 100 | -57 | 0.161 | 53083 | 16183 |
NWP | Pressure Altitude Calculator
https://waipangsze.github.io/2025/02/07/NWP-Pressure-Altitude-Calculator/