How Big Should Your Social Circle Actually Be?

Robin Dunbar's research on social network size produced a nested model: a typical human can maintain about 5 very close relationships, 15 close friends, 50 friends, and 150 acquaintances. The 150 number gets the most attention, but the more useful insight is the layered structure — that relationships exist at different depths requiring different levels of investment to maintain.

The numbers themselves are averages with significant individual variation. Some people thrive with 2 close friends; others need 7 to feel supported. The right number for you depends on your social energy capacity, how much time your lifestyle allows for maintenance, whether you prefer a few deep connections or broader shallower ones, and how reliably you invest in relationships you value.

Most people who feel lonely or under-connected don't have a total circle size problem — they have a close-tier deficit. They have plenty of acquaintances and casual friends but too few genuinely close relationships. The most valuable thing the Social Circle Size Calculator does is show you which tier is causing the problem.

Close friends (2–8 people): High investment, high reciprocity. These are the people you'd call if something went very wrong, who know you well enough to give you honest feedback, and with whom you don't have to manage how you come across. These relationships require the most maintenance investment — regular, genuine contact and reliability in hard times. Most adults have 2–5 close friends; many have fewer than they'd like.

Good friends (5–20 people): Regular contact, genuine connection. You'd make effort to see these people and would be glad to hear from them unexpectedly. These relationships require consistent but lower-investment contact — a message, a plan a few times a year. They often serve as the recruiting pool for close friendships when circumstances change.

Casual friends (10–50 people): Occasional contact, warm but low-maintenance. People you like and enjoy when you see them but don't actively maintain. Many of these are situational — colleagues, neighbors, people from previous life phases. Worth keeping warm but not worth active investment for their own sake.

Weak ties (50–200 people): Acquaintances. The most undervalued layer. Research consistently shows that weak ties provide disproportionate value for information, opportunity, and serendipity — job referrals, introductions, unexpected connections. You don't need to maintain them actively; you just need to stay warm and not let them go entirely cold.