Physics and Engineering
Pressure Altitude Calculator
Pressure Altitude Calculator estimate aviation pressure altitude from indicated field elevation and local altimeter setting using the standard 29.92 inHg reference.
Physics and Engineering
Pressure Altitude Calculator
Estimate aviation pressure altitude from indicated field elevation and local altimeter setting using the standard 29.92 inHg reference.
Formula
Pressure altitude approximately = field elevation + (29.92 - altimeter setting inHg) x 1,000 feet.
About the Pressure Altitude Calculator
Estimate aviation pressure altitude from indicated field elevation and local altimeter setting using the standard 29.92 inHg reference.
How the Pressure Altitude Calculator Works
The altimeter-setting departure from standard pressure is converted to an approximate feet correction and added to the entered indicated elevation.
Formula
Pressure altitude approximately = field elevation + (29.92 - altimeter setting inHg) x 1,000 feet.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Indicated field elevation (required) - enter in ft.
- Altimeter setting (required) - enter in inHg.
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Estimated pressure altitude (ft)
- Pressure correction (ft)
- Difference from 29.92 inHg (inHg)
- Estimated pressure altitude (m)
Pressure Altitude Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Indicated field elevation | 1500 ft |
| Altimeter setting | 30.12 inHg |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
This is the common cockpit approximation, not a full atmospheric reduction. Confirm operational values with approved instruments, weather data, and aviation procedures.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the Pressure Altitude Calculator calculate?
Estimate aviation pressure altitude from indicated field elevation and local altimeter setting using the standard 29.92 inHg reference.
Which formula does the Pressure Altitude Calculator use?
Pressure altitude approximately = field elevation + (29.92 - altimeter setting inHg) x 1,000 feet. The altimeter-setting departure from standard pressure is converted to an approximate feet correction and added to the entered indicated elevation.
What should I check before using the Pressure Altitude Calculator result?
This is the common cockpit approximation, not a full atmospheric reduction. Confirm operational values with approved instruments, weather data, and aviation procedures.