Weight and Balance Calculator
Legal at takeoff is not legal at landing.
Work out Weight and Balance. Legal at takeoff is not legal at landing. Free, with no account and nothing to install.
Centre of gravity (m)
2.288
1,090 kg of 1,150 kg · within the envelope
Centre of gravity is total moment divided by total weight, and moment is weight times arm. The arithmetic is simple; the limits are not, which is why they are inputs from your own flight manual rather than anything this page supplies. Takeoff and landing are separate checks. Burning fuel moves the centre of gravity towards the opposite end from the tanks, and an aircraft legal at takeoff can be outside the envelope on arrival — which is why the fuel burn column exists. Being within limits is not the same as being sensible. An aft CG makes an aircraft less stable in pitch and lighter on the controls; a forward one raises stall speed and takeoff distance. Both are legal, and they fly differently.
How the Weight and Balance Calculator works
Weight, moment and centre of gravity from a station list, checked against envelope limits you enter from your own flight manual — plus where the CG ends up once the fuel is burned.
Also known as: aircraft centre of gravity calculation · am i within the cg envelope · moment arm loading aircraft · cg shift as fuel burns
Frequently asked questions
How is centre of gravity calculated?
Total moment divided by total weight, where each station's moment is its weight times its arm. The arithmetic is simple; the limits are the part that needs the flight manual.
Why does the CG move as fuel burns?
Because fuel has an arm like anything else. Burning it removes weight at that arm, moving the centre of gravity towards the opposite end — which is why takeoff and landing are separate checks.
Can an aircraft be within weight and outside CG limits?
Easily, and it is the more dangerous of the two. A light aircraft with baggage aft and no rear passengers is a classic aft-CG loading at well under maximum weight.
What does an aft CG do?
It reduces pitch stability and lightens the controls, and it worsens spin recovery. A forward CG raises stall speed and takeoff distance. Both are legal inside the envelope, and they fly differently.
Why doesn't this page have the limits built in?
Because they are type-specific, weight-dependent and legally binding. This checks arithmetic against limits you supply; it is not the loading calculation itself.
Put this calculator on your own site
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