Performance table lookup
Reads a POH performance table of one, two, or three variables, like takeoff distance by altitude, temperature, and weight, between its listed values, refuses to guess beyond them, and applies corrections as labeled steps.
Planning and education aid. Not for primary navigation. Full disclaimer
Experimental: not yet fully verified. How results are checked
The table gives 1,485; with the corrections, 1,336.5.
| First variable | Second variable | Value | Weight |
|---|---|---|---|
| 2000 | 20 | 1325 | 0.2500 |
| 4000 | 20 | 1540 | 0.2500 |
| 2000 | 30 | 1420 | 0.2500 |
| 4000 | 30 | 1655 | 0.2500 |
| Step | Value |
|---|---|
| bilinear interpolation of the table | 1485 |
| 10 kt headwind (-10%) | 1336.5 |
- From the table
Provenance
- Computed by
- aviation.loading.table-interpolate 1.0.0, core 0.1.0
- Model
- Linear interpolation along each variable between the listed values that bracket the query: 2 cells for one variable, 4 (bilinear) for two, 8 (trilinear) for three, each weighted by the product of its distances. No extrapolation. Corrections apply in order: percent (× (1 + p/100)), add, or multiply (PHAK, aircraft performance)
- Accuracy
- Exact interpolation of the table as entered; real performance between table rows is not linear, and the table is only as good as the book it came from
- Notes
- 1 shown with the answer
- Cites
- Federal Aviation Administration, Pilot's Handbook of Aeronautical Knowledge, FAA-H-8083-25C
Something look off?
How we got thisFormula, worked example, sources, and proof
Model: Linear interpolation along each variable between the listed values that bracket the query: 2 cells for one variable, 4 (bilinear) for two, 8 (trilinear) for three, each weighted by the product of its distances. No extrapolation. Corrections apply in order: percent (× (1 + p/100)), add, or multiply (PHAK, aircraft performance)
Accuracy: Exact interpolation of the table as entered; real performance between table rows is not linear, and the table is only as good as the book it came from
Worked example: Takeoff distance at 3,000 ft and 25 °C, less 10% for a headwind. Source: add-aviation-suite bilinear scenario: the four cells around 3,000 ft and 25 °C.
You enter
- Look up first variable at
- 3000
- Second variable at
- 25
- Corrections
- 10 kt headwind, percent, -10
- Variable names
- pressure altitude, temperature
- Table
- 0, 0, 1000 0, 10, 1070 0, 20, 1145 0, 30, 1225 2000, 0, 1150 2000, 10, 1235 2000, 20, 1325 2000, 30, 1420 4000, 0, 1335 4000, 10, 1435 4000, 20, 1540 4000, 30, 1655
You get
- Answer
- 1,336.5
- From the table
- 1,485
Review: Not yet independently reviewed by a flight instructor (CFI).
Last verified: 2026-09-19, when a maintainer last confirmed this tool's sources at the issuer. See the sources ledger.
Status: version 1.0.0, core 0.1.0. See this tool in the verification report.
Checked against: 13 golden test vectors (download the test vectors, each with its source and tolerance). See how results are checked and every source.
Sources
- Pilot's Handbook of Aeronautical Knowledge, FAA-H-8083-25C, Federal Aviation Administration, FAA-H-8083-25C. Aircraft Performance chapter (reading performance charts and tables, interpolating between listed values).
Experimental means this tool has not yet met the stable bar: at least 20 golden vectors, differential tests, and an independent worked example.