Aircraft Weight & Balance
Total weight, moment and centre of gravity from a list of stations, the landing figures after fuel burn, and a check against the handbook limits you enter.
Take-off weight and CG from your stations, the landing weight and CG after fuel burn at the fuel arm, a station-by-station moment table, and whether each is within the limits you entered — with the margins.
Example: Empty 1,500 lb at 39 in, pilot 340 at 37, rear 170 at 73, bags 50 at 95, fuel 240 at 48: 2,300 lb, CG 43.37 in; after 150 lb of fuel 2,150 lb at 43.05 — within 2,400 lb and 35–47.3 in.
Moments add,
weights divide.
How the centre of gravity is found from stations, what fuel burn does to it, how the limits are compared, and why the aircraft’s own data are the only data.
Stations and moments
Every item aboard sits at an arm — its distance from the datum the manufacturer chose — and contributes a moment of weight × arm. Add the weights, add the moments, and the centre of gravity is the total moment over the total weight. The empty weight and its arm come from the aircraft’s current weighing record; the seat, baggage and fuel arms from its handbook. Enter each as “label weight arm”.
Fuel burn
Fuel burned in flight comes off at the fuel station’s arm, so the landing weight is the take-off weight less the burn and the landing moment the take-off moment less burn × fuel arm. A fuel tank ahead of the aft limit moves the CG aft as it empties; the page shows both points.
Limits
Maximum take-off and landing weights and the forward and aft CG limits are handbook figures you enter; the page compares and gives the margins. Many aircraft have an envelope whose forward limit moves aft as weight increases — one CG range cannot represent that, and both the take-off and the landing point must then be read against the envelope by hand.
What the number does not settle
Moment ÷ 1,000 conventions, utility-category envelopes, and the legal status of the calculation are matters for the handbook and the operator. A planning aid, not a substitute for the pilot’s operating handbook, the aircraft’s limitations or the rules that apply to the flight. Inputs stay in your browser; the same anonymous usage counts as the rest of the site apply.