Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Density altitude (ft)
8,000
Pressure altitude (ft)
5,000
ISA temperature (°C)
5.0
ISA deviation (°C)
25.0
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter field elevation (ft).
- 2Enter altimeter setting (inHg).
- 3Enter temperature (°C).
- 4Read your density altitude (ft) on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
Hot and high kills climb performance. Enter field elevation, altimeter setting, and temperature to get pressure and density altitude.
Worked example
Using the values the calculator loads with:
Inputs
- Field elevation: 5000 ft
- Altimeter setting: 29.92 inHg
- Temperature: 30 °C
Results
- Density altitude (ft): 8,000
- Pressure altitude (ft): 5,000
- ISA temperature (°C): 5
- ISA deviation (°C): 25
What each field means
Inputs
- Field elevation (ft)
- The field elevation used in the calculation, measured in ft. Starts at 5000 ft so you have a working example on load.
- Altimeter setting (inHg)
- The altimeter setting used in the calculation, measured in inHg. Starts at 29.92 inHg so you have a working example on load.
- Temperature (°C)
- The temperature used in the calculation, measured in °C. Starts at 30 °C so you have a working example on load.
Results
- Density altitude (ft)
- Returned as a whole number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Pressure altitude (ft)
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- ISA temperature (°C)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- ISA deviation (°C)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the density altitude calculator work?
Hot and high kills climb performance. Enter field elevation, altimeter setting, and temperature to get pressure and density altitude. The underlying maths is: DA ≈ PA + 120 × (OAT − ISA temp).
What do I need to enter?
3 values: field elevation, altimeter setting, and temperature. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the density altitude (ft) result mean?
It is returned as a whole number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Density Altitude Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/density-altitude
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/density-altitude" target="_blank" rel="noopener">Density Altitude Calculator — RevenueLab</a> (2026).</p>
Source: [Density Altitude Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/density-altitude) (2026).