Uses operating handbook data to do the fiddly calculation very quickly and easily.
Enter the take off weight, QNH , field elevation, temperature, wind, and if grass or hard runway.
Results display gives TOD in metres, including a 1.25 factor.
Source data available in the app to enable a cross check with your handbook data.
Results time-out after an hour to force recalculation incase conditions change.
All figures are for a level runway and using manufacturers take-off technique.