ForeFlight recently added takeoff and landing performance calculations to its Performance Plus subscription level.

ForeFlight uses the aircraft pilot operating handbook charts, the loading that you have provided and the weather conditions that it obtains to calculate an estimated takeoff distance and landing distance.

Some folks at the AOPA Safety Institute decided to see how accurate the ForeFlight results are to those obtained by actual pilots. They went flying on a near perfect day at a small airport with a C-1-72 and a Beechcraft Bonanza and make four takeoffs and landings with each to compare their results.

Here is a video of their testing and the results they obtained.