Load the airplane — passengers, baggage, and fuel — and watch the weight and center of gravity stay inside the envelope. Configure the tanks, seat rows, and baggage bays to match your aircraft.
The preloaded profiles use typical / sample figures for each model. Empty weight, arms, limits, and the envelope vary by individual airplane and change with equipment and repairs. Always verify every figure against your specific aircraft's POH/AFM and its own weight-and-balance paperwork before any real flight. Every number in this app is editable for exactly that reason. This tool is for planning and learning — it does not replace the POH.
Use it right here in the browser, or add it to your home screen from its own icon. For the hangar and anywhere with no signal, download the offline copy: every calculation runs on this device, so that one file works in airplane mode with nothing left to load.
✓ You're using the installed app version.
Basic empty weight and limits. On most light singles the empty weight includes unusable fuel and full oil — confirm in your POH.
Trip fuel burn is subtracted from the total fuel on board to give your landing weight and CG. If your aircraft has no separate zero-fuel or landing limit, leave it equal to max gross.
Each corner is a CG (in) and weight (lb) pair, ordered around the envelope shape from the POH chart. Add or remove corners to match your aircraft's chart.
Set each tank's capacity and arm, then slide to how much is actually on board. Weight uses the lb/gal figure above (avgas ≈ 6.0, Jet A ≈ 6.7).
Each row has its own arm and seat count — add rows or seats to match the cabin. Enter each person's actual weight (clothing included); tap a preset or type a weight. Empty seats count as zero.
Yes — baggage matters, twice over: it adds weight, and aft bays sit far behind the CG, so a heavy bag can push you out the back of the envelope even under gross. Each bay has its own arm and placard limit.
| Item | Weight | Arm | Moment |
|---|
Moment = weight × arm. CG = total moment ÷ total weight. All arms in inches from the datum in your POH.