BOAT-COMPARATOR Guide

How many people aboard? Legal capacity vs comfortable capacity

12 passengers maximum, design categories, children counted: understanding a rental boat's capacity — and why 8 seats never equal 8 adults.

By Clément Lacaille, editor of Boat-Comparator · updated 22 Sept 2026

'We'll be 13, is that OK?' No — and it is not the operator's call: a boat's capacity is a regulatory limit, checked at sea, and exceeding it voids the insurance. Here is how it works.

The rule of 12

In recreational rental it is 12 passengers maximum whatever the boat (beyond that you enter 'passenger ship' regulation — another world). Each boat then displays ITS capacity, set by design category and certification: 6, 8, 10 or 12 people — children count as whole people, babies included.

Legal capacity ≠ comfortable capacity

A RIB certified for 10 carries 10 people seated under way — not 10 adults sprawled in the sun with cool boxes and paddleboards. The regulars' golden rule: legal capacity minus 2 = a comfortable day. For a sailing week, count real double berths, not 'convertible' saloon benches.

What gets checked at sea

Patrols verify the headcount, the lifejackets (one per person, correct sizes) and the safety equipment for the zone. Exceeding = fine, return to port, and above all void insurance if anything goes wrong — the real sanction.

Where to read your boat's capacity

On the builder's plate, fixed in the cockpit or near the helm: it states the maximum number of people, the maximum load in kilos (people + luggage + equipment), the maximum engine power and the design category — A (ocean), B (offshore), C (inshore, the most common in rental), D (sheltered waters). The listing repeats that figure: if it advertises more seats than the plate allows, the listing is wrong. If in doubt at boarding, ask to see the plate — that is a good renter's reflex, not rudeness.

Why it matters: what the research says

Overloading is not a theoretical offence: it reduces freeboard, degrades stability and complicates evacuation. A study by P. J. and N. O'Connor published in 2005 in Accident Analysis & Prevention, analysing 333 recreational boating deaths in Australia, found that nearly half of the vessels involved carried too few lifejackets for the people on board — and that only 9% of victims were wearing one. Counting people also means counting lifejackets: our guide to life jacket rules for children covers sizes and obligations.

Who counts towards capacity: skipper, babies, crew

Everyone counts: the plate capacity covers persons on board, skipper and babies included — construction standards actually reckon a flat weight of around 75 kg per adult when setting the maximum load, luggage and cool boxes included. One nuance: the ceiling of 12 concerns passengers — on a skippered trip the professional is added as crew, which allows 12 guests plus the skipper. That is why a listing sometimes reads "12 + crew": not a mistake, just the regulation.

Typical rental capacities

To size your group before filtering: a license-free boat generally takes 4 to 6 people, a rental RIB 8 to 12 depending on size, a motorboat 8 to 12 as well, and a weekly sailboat is counted in real berths (6 to 10 on common monohulls). Beyond 12, no standard recreational rental fits: that is skippered day-charter territory — our with or without a skipper guide explains the switch.

The booking reflex

Filter by the real number of participants (Boat-Comparator discards too-small boats when capacity is published), and for 12+ groups move up a format: two boats in flotilla — often more fun — or a skippered day-charter built for it.

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Also worth reading

• How much does it cost to rent a boat in 2026? Real prices
• License-Free Boat Rental in France: Rules, Prices & Where to Book
• Renting with or without a skipper: how to choose