What do seat pitch and width actually mean on a plane?
Pitch is the distance from a point on one seat to the same point on the seat in front — effectively front-to-back space. Width is the distance between the inner edges of the armrests. Together they determine how comfortable a flight will be, and airlines rarely advertise either.
Pitch is not legroom. This is the crucial distinction. Pitch measures seat-to-seat spacing including the thickness of the seat itself, so a thinner seat back at the same pitch gives more actual knee room. Airlines have used slimline seats to add rows while advertising an unchanged or barely reduced pitch — the pitch number understates how much the experience changed.
Typical figures:
Economy short-haul — 28 to 31 inches. Low-cost carriers sit at the bottom of that range.
Economy long-haul — 30 to 33 inches.
Premium economy — 34 to 38 inches, and the wider seat matters as much as the pitch.
Business — varies enormously by product; a lie-flat seat is measured in bed length instead.
Width matters more than people expect. Economy widths run roughly 16.5 to 18.5 inches. The difference comes from cabin configuration: a Boeing 777 in 9-abreast gives a noticeably wider seat than the same aircraft in 10-abreast, and most airlines have moved to 10. The 787 in 9-abreast against 8-abreast is a similar story. Two airlines flying the same aircraft type can offer materially different seats.
Where to find the real numbers. Airlines rarely publish them clearly. Independent seat databases and review sites publish measured pitch and width by airline, aircraft type and configuration — the configuration is what you need, since one airline may operate several versions of the same aircraft.
Other factors worth checking: whether a bulkhead or exit row genuinely has more space, whether the seat reclines, proximity to galleys and toilets, and whether a seat is misaligned with a window.