Short answer: the best city pass for a family is rarely the one marketed as a “family pass.” It’s whatever combination gives you passes for the adults and lets the age rules do their job for the kids — because in a lot of major cities, the kids were never going to pay full admission anyway.
Age rules change the math more than any discount does
This is the detail that catches families out. Most French national museums — the Louvre, Orsay, the Arc de Triomphe — are free for under-18s, and free for EU residents under 26. In London, individual attractions set their own age cutoffs, commonly starting to charge from age 5 or from age 16 depending on the site. That means a family of four is often really a “two paying adults” trip once you check each attraction’s rule, not a four-person expense.
Buy a pass sized for four and you can end up prepaying entry that would have cost nothing. The fix is simple: check the age rule for every attraction on your list before you buy anything, and price the pass only against what the paying members of your group would actually spend.
The realistic pace with kids is two attractions a day
City passes are priced around an adult’s brisk sightseeing pace — often three or four paid attractions a day for the multi-day math to work. That pace doesn’t survive contact with children. Queuing takes longer, attention spans are shorter, and a proper lunch break isn’t optional. Two attractions a day is a more honest planning number for most families with young kids, and that changes which pass tier — if any — clears break-even.
What to actually compare
- List the family’s real must-sees, not the whole list of what’s included in a pass.
- Apply the age rule to each one. Note which entries are free for your kids and which aren’t.
- Price single tickets for the paying adults only, then compare that to the pass price for the same people.
- Check the pace assumption. If the pass needs three attractions a day to break even and your family manages two, it’s likely not worth it — even if it looks like a bargain for a solo adult traveler.
Where family passes still make sense
They’re worth it when the paying adults alone would hit several expensive attractions inside the validity window — a couple doing the Louvre, Orsay and Versailles in Paris, for instance, easily clears a multi-day pass price regardless of the kids’ free entry. The pass decision, in that case, has nothing to do with family size at all; it’s the same adult-focused math as any other trip, just with free tickets riding alongside it for the children.
The mistake to avoid
Don’t buy a child pass to “match” the parents’ passes out of tidiness. If the attraction is free for your child’s age anyway, a child pass duplicates something you already had for nothing. Check the age cutoff first, every time — it’s usually printed on the attraction’s own ticketing page, and it’s worth the two minutes.
The verdict
Work out who in your family actually pays admission before you price any pass at all, then run that smaller list — adults only, plus whichever kids don’t qualify for free entry — through the calculator. It applies age rules automatically and will tell you honestly whether a pass helps your specific group, rather than the group the marketing assumes you have.