Aircraft Center of Gravity Calculator
Aerodynamic Center (AC), Mean Aerodynamic Chord (MAC), Center of Gravity (CG), Neutral Point (NP) and Wing Area
Wing Root Chord (A):
Enter the variables at left using the same units for all entries.
For an aircraft to be stable in pitch, its CG most be forward of the
Neutral Point NP by a safety factor caled the Static Margin, which
is a percentage of the MAC (Mean Aerodynamic Chord).
Static Margin should be between 5% and 15% for a good stability.

Low Static Margin gives less static stability but greater elevator
authority, whereas a higher Static Margin gives a more static
stability but lesser elevator authority.
Too much Static Margin makes the aircraft nose-heavy, which
may result in elevator stall at take-off and/or landing.
A tail-heavy aircraft will also be more unstable and susceptible
to stall at low speed, e. g. during the landing approach.
Wing Tip Chord (B):
Wing Sweep Distance (S):
Wing Half Span (Y):
Stabiliser Root Chord (AA):
Stabiliser Tip Chord (BB):
Stabiliser Sweep Distance (SS):
Stabiliser Half Span (YY):
Distance between both LE's (D):
Enter Static Margin, then
Mean Aerodynamic Chord MAC =
Sweep Distance at MAC (C) =
From Root Chord to MAC (d) =
Static Margin % of MAC =
From Wing Root LE to AC =
From Wing Root LE to NP =
From Wing Root LE to CG =
Wing Area =
Stabiliser Area =
Calculate Wing Loading
Wing Area : sq. in
sq. dm
Aircraft Weight : ounces
WING LOADING = oz/sq.ft