Weight & Balance

Why Weight & Balance Decides How an Aircraft Flies

Loading is not just about staying under maximum gross weight; it is about where that weight sits. An aircraft loaded within its weight limit but outside its center-of-gravity (CG) range can be difficult or impossible to control. A forward CG increases stability but also stall speed and control forces; an aft CG lightens the controls but erodes stability and can make a stall unrecoverable. The tools in this category quantify both the total weight and the CG position so you can confirm every flight is loaded inside the envelope the manufacturer certified.

The calculations themselves are simple — weight times arm equals moment, and total moment divided by total weight gives CG — but the discipline of doing them for every load, every time, is what keeps the arithmetic honest.

Which weight & balance tool should I use?

Use the weight and balance calculator to enter each station — front seats, rear seats, baggage, and fuel — and compute total weight, total moment, and the resulting CG. Take that result to the CG envelope checker to see, visually, whether your weight-and-CG point falls inside the certified envelope and how much margin remains at the forward and aft limits. Before you ever load passengers or bags, the useful load calculator tells you how much payload and fuel the aircraft can legally carry once empty weight is accounted for.

A practical loading workflow

Start with useful load: subtract the empty weight from the maximum gross weight to see the total budget of fuel plus payload you have to work with. Decide how much fuel the mission needs — a figure you can size with the fuel planning calculators — and what remains is your people-and-bags budget. Enter the actual load into the weight and balance calculator, then plot the ramp, takeoff, and anticipated landing CG on the envelope checker, since burning fuel moves the CG during the flight. If any point falls outside the envelope, redistribute baggage or passengers and recompute until every phase is inside the limits.

Common mistakes to avoid

The most common error is checking only takeoff weight and CG and ignoring how fuel burn shifts the CG in flight — an aircraft legal at takeoff can drift aft of limits before landing. Others include using a generic empty weight instead of the actual figure from your aircraft’s current weighing record, forgetting that equipment changes and new avionics alter empty weight and arm, and rounding arms or weights too aggressively. Baggage-compartment placards state a maximum for a reason: exceeding a compartment limit can be a structural issue even when total weight is legal.

Limitations & how to verify

Our tools include sample aircraft profiles for illustration, but the only authoritative weight, arm, and envelope data for your airplane is in its current POH or AFM and its individual weight-and-balance record. Always enter the numbers specific to your tail number, and confirm the envelope shape against the chart in your manual. The formulas and assumptions we use are documented on our methodology page, with sources listed on the sources page.

Related learning

Work through a complete loading problem in our worked examples, and keep the printable worksheets in your flight bag. Because loading interacts with runway performance, the performance calculators are a useful companion when you are heavy on a hot day.