All tools / Aviation & flight
Mass & balance calculator
Weight and centre of gravity with your aircraft’s stations, a CG envelope chart and saved aircraft.
How the CG is found
Each item’s weight is multiplied by its arm (its distance from the datum) to give a moment. The total moment divided by the total weight is the centre of gravity. It must sit inside the envelope at both take-off and landing weight, because burning fuel moves it.
Your data stays with you
Saved aircraft are kept in this browser only. Always use the current weight and balance report for your aircraft; empty weights and arms differ between individual aircraft of the same type.