Transport & Manufacturing
Aircraft Center of Gravity (CG) Weight and Balance Envelope Sizer
Calculate aircraft center of gravity (cg) weight and balance envelope using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Aircraft Center of Gravity (CG) Weight and Balance Envelope Sizer using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
CG arm = Σ(weight × arm) ÷ Σ weight, all arms from the same datum and in the same units
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • CG arm = total moment/total weight, with moments and arms referenced to the same aircraft datum and consistent units.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • This calculates a CG location only. An envelope check requires aircraft-specific forward/aft limits versus weight, loading category and datum, plus correct moment-index scaling. Validate positive total weight; include all loaded items/fuel. No universal safe-CG range follows from two numbers.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Empty weight (lb) | Empty weight arm (in) | Pilot & passengers (lb) | Centre of gravity arm |
|---|---|---|---|---|
| Worked example | 1,500 | 38 | 340 | 40.3052 in |
| Half the amounts | 750 | 19 | 170 | 20.1526 in |
| Double the amounts | 3,000 | 76 | 680 | 80.6103 in |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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