Free tool
E6B Flight Computer
A full flight computer in the browser: unit conversions across eleven aviation categories, time-speed-distance and fuel solvers, pressure and density altitude with true airspeed, the wind triangle, climb and descent gradients, and weight-shift math. Pick a function from the list, type your numbers, read the answer — every field is editable.
The defaults are worked examples, not blanks: a PA-28 at a 5,000 ft field on a 30.10 inHg, 30 °C afternoon is already at 7,583 ft density altitude, and the wind-triangle function draws the air vector, wind leg, and ground track so you can see where the crab angle comes from.
Density altitude
Pressure altitude corrected for nonstandard temperature (FAA-H-8083-25C ch 11), computed with the same standard-atmosphere inversion that drives the density-altitude sim — not the 120 ft/°C rule of thumb.
Reading the screen: cyan is a value you entered, green is a computed result, amber means a field still needs input or the entry needs a CHECK. SOLVED lights when every result is computed; STO keeps a value to reuse in another function; the line-select keys beside the screen pick the field the keypad edits.
Pressure altitude corrected for nonstandard temperature (FAA-H-8083-25C ch 11), computed with the same standard-atmosphere inversion that drives the density-altitude sim — not the 120 ft/°C rule of thumb. TAS scales CAS by 1/√σ at the density altitude. Worked example: a PA-28 at a 5,000 ft field, 30.10 inHg and a 30 °C afternoon is already at 7,583 ft density altitude.
Keyboard shortcuts
- / or Ctrl+K — jump to the function search
- Digits, . or : (outside a field) — type into the scratchpad, then press a ◄ line-select key to insert
- Arrow keys — move around the keypad; Enter opens the focused function
- Home / End — start / end of a keypad row
- Alt+1…8 — jump to a keypad group
Free, no signup needed
Next step
- Density altitude sim
- Cross-country navlog (printable)
- Fuel and endurance tool
- Find your weak areas — the free 24-question Readiness Test, scored by knowledge area.
- Create a free account for the full bank: 2,074 verified questions with the FAA source on every answer, a timed practice exam, and a missed-questions drill.
The Private Pilot Quick-Review Study Guide covers this in the performance and navigation chapters. It is in CFI review and not on sale yet; the guide page has the list for launch notes.