シートピッチ (Seat Pitch)

シートピッチとは？

Seat pitch is the distance measured from any point on one seat to the identical point on the seat directly in front — most commonly measured from headrest to headrest, or from seatback to seatback. It is the industry's primary proxy for legroom, though the actual space available for knees and legs depends on seat thickness as well. Seat pitch is expressed in inches and is the figure most prominently advertised by airlines when describing their cabin class configurations.

シートピッチの測定方法

Airlines typically measure seat pitch from the back of one seat to the back of the seat in front. Because modern seats have varying seatback thicknesses — ranging from 2.5 inches on ultra-slim models to over 5 inches on traditional designs — pitch alone does not determine how much knee space a passenger actually receives. A 30-inch pitch seat with a 3-inch-thick seatback provides roughly 27 inches of knee clearance; the same pitch with a 5-inch seatback leaves only 25 inches.

The relevant complement to pitch is seat width, which governs shoulder comfort. Together, pitch and width define the fundamental spatial envelope each passenger occupies during flight.

クラス別の一般的な範囲

• Economy Class: 28–34 inches. Budget carriers (Spirit, Ryanair, IndiGo) typically offer 28–30 inches; full-service carriers 31–33 inches; premium economy cabins 34–38 inches.
• Business Class: 42–80+ inches. Short-haul business seats are typically 38–44 inches; long-haul lie-flat seats range from 58 to over 80 inches in length.
• First Class: 60–87 inches. Emirates A380 First Class suites have a floor area of roughly 50 × 29 inches per seat with a separate mini-bar.

主な事例

The Boeing 787-9 in economy class typically seats passengers at 31–32 inches pitch in standard configurations. When airlines configure the aircraft in high-density layouts, pitch can drop to 30 inches. In contrast, the same aircraft in business class (e.g., Japan Airlines Sky Suite) offers 61-inch pitch in a fully lie-flat configuration. The Airbus A380 operated by Singapore Airlines in its three-class layout provides 32 inches economy, 50 inches premium economy, and 81-inch lie-flat beds in Suites First Class.

The minimum certified seat pitch for transport category aircraft is 26 inches — a threshold that guarantees emergency evacuation can be completed within 90 seconds even in the most cramped configuration.

関連コンポーネント

Seat pitch directly affects passenger access to overhead bins and determines how easily passengers can reach the lavatory mid-flight. The recline angle of the seatback is geometrically linked to pitch — at shorter pitch, even modest recline intrudes significantly into the space of the passenger behind. Airlines balance these factors against revenue-per-seat calculations when configuring their cabin class tiers.