Hi,

3 things spring to mind, in no particular order;

1. Jepp Flitestar has a TO perf calculator,
2. There is a program for the Palm, DSSTOP that seems to work quite
well, &
3. I have "standard" TO and landing distances worked out based on 1000'
alt, 20 deg, max wt, 0 wind and a paved, level, dry runway. Any
deviation from these factors in a 'negative' direction will make me
reevaluate using the POH - ie higher temp or a wet grass strip. For the
Archer the distances to/from 50' are 700m for TO and 450m for landing.

HTH