TOPCAT is a highly realistic, easy-to-use planning tool for all serious flight simulator enthusiasts. It brings into a single application all of the calculations required to plan for safe and repeatable take-offs and landings.
TOPCAT will provide you, the captain, with Load Sheets, Take-off and Landing Performance Data reports including all relevant speeds (V1,VR,V2), de-rated and assumed temperatures and limiting weights (field limit, obstacle limit, climb limit, brake energy limit and tire speed limit).
ToPCAT - take-off and landing performance calculation tool 
TOPCAT is a highly realistic, easy-to-use planning tool for all serious flight simulator enthusiasts. It brings into a single application all of the calculations required to plan for safe and repeatable take-offs and landings.
TOPCAT will provide you, the captain, with Load Sheets, Take-off and Landing Performance Data reports including all relevant speeds (V1,VR,V2), de-rated and assumed temperatures and limiting weights (field limit, obstacle limit, climb limit, brake energy limit and tire speed limit).