Definition
A required preflight calculation that confirms an aircraft's total loaded weight is within certified limits and that the center of gravity falls within the approved forward and aft range for safe flight.
Plain English
Working out how heavy the aircraft is with everything loaded, and where that weight sits along the aircraft, to make sure both are within the limits the manufacturer says are safe.
Context Anchor
Pilots encounter weight-and-balance before flight when planning fuel, passengers, baggage, cargo, or training scenarios that test safe loading decisions.
Derivation
Weight comes from an old word meaning heaviness. Balance comes from an old idea of a two-pan scale. Together, the phrase points to the two checks that matter in aviation: how much load the aircraft carries and how that load is arranged.
Why Pilots Care
An aircraft outside weight or balance limits may become uncontrollable, exceed structural limits, or suffer degraded climb and handling performance.
Analogy
Think of a seesaw. The total amount on it matters, but where that weight is placed matters just as much. An airplane has the same kind of concern, only with approved limits that must be followed.
Intuition Check
Do not read weight-and-balance as just “how much the airplane weighs.” In aviation, it also means whether the loaded airplane balances within its approved safe range.
Example Sentence 1
Before the cross-country flight, the student completed a weight-and-balance calculation to confirm the aircraft was within limits with full fuel and two passengers.
Example Sentence 2
An aft center-of-gravity condition discovered during weight-and-balance review required the pilot to shift cargo forward.