| English | SI |
| Temperature Offset | ± °F | ||
| Pressure Altitude | ft MSL |
Note: Allowable altitudes are between -500 m (-1640 ft) and 84 850 m (278 385 ft) and temperature offsets between ±75°C (±135°F)
| Geometric Altitude | ft | |
| Temperature | R | |
| °F | ||
| Pressure | psia | |
| Density | lbm/ft3 | |
| Speed of Sound | ft/s |
This calculator is based on the International Standard Atmosphere (ISA). For the temperature offset, pressure is calculated according to ISA conditions and the temperature offest is then used to adjust temperature and density.