Great question! The standard width of a typical park bench is usually between 48 and 72 inches (4 to 6 feet). For three people to sit comfortably side by side, I’d recommend a bench that’s at least 60 inches (5 feet) wide. Here’s the breakdown: each person needs about 18 to 24 inches of personal space for comfortable seating, depending on body size and the amount of elbow room you want.
If you’re fitting three average-sized adults, a 60-inch bench gives each person 20 inches—cozy but workable. For extra comfort, especially if people are wearing bulky coats or like a bit of space, go for a 72-inch bench (6 feet). That provides 24 inches per person, which is very spacious.
Many public parks use benches that are 48 inches wide, but those are really meant for two people. For three, you’ll want to look for “three-person” or “triple” benches. Also consider the bench’s depth (typically 17–20 inches) and backrest height for overall comfort.
In short: aim for 60–72 inches wide for a happy trio. Hope that helps you pick the perfect bench!