How often should you check in with friends? A layer-by-layer cadence.

How often you should check in depends on which closeness layer the friendship sits in: inner circle weekly, sympathy group monthly, affinity group quarterly, acquaintances once a year. Predictability beats frequency — Roberts & Dunbar (2011) found it is the gap more than the total time that erodes a bond.

There is no universal answer to “how often should you check in with friends?” — but there is a useful one. Friendship research over the last twenty years, combined with Robin Dunbar’s layered model of social capacity, gives us a rule of thumb that holds up surprisingly well in practice. For your inner 5: weekly. For your close 15: monthly. For your wider 50: quarterly. For the outer 150: once or twice a year. Below those minimums, the relationship erodes. Above them, you cannot maintain breadth.

The rest of this post unpacks where those numbers come from, what counts as “contact,” and how to keep up cadence without it feeling like a job.

The layers — a quick refresher

Dunbar’s number describes the upper limit of stable relationships a person can maintain — around 150 (for more on why that ceiling matters, see how many friends is normal). But within that 150, your relationships are stratified into nested layers of roughly:

• 5 — the support clique: people you’d call at 3am
• 15 — close friends and family with whom you share emotional weight
• 50 — friends you’d invite to a wedding without thinking
• 150 — the people you’d recognise, ask after, and call by name

Each layer has its own emotional bandwidth, and — critically — its own time budget. The cadence that keeps a relationship alive scales with the layer.

The research-aligned cadence

Roberts and Dunbar’s 2011 longitudinal study followed how relationships shift when contact drops below a layer’s natural rhythm. The pattern is consistent across the studies that have replicated it:

• Inner 5 — weekly minimum. A meaningful exchange at least once a week. Below this, even very close friendships start to feel distant; the topic of “we should catch up” replaces actual catching up.
• Close 15 — monthly minimum. A real conversation roughly once a month. Quarterly is the threshold at which a 15-tier friend typically drifts to the 50.
• Wider 50 — quarterly minimum. A check-in every three or four months. The cadence here is forgiving because the depth is lower; what matters is that contact happens at all.
• Outer 150 — annual. A genuine annual touch — birthday message, holiday card, a “thinking of you” note after seeing them in a photo. Once-a-year keeps the channel warm indefinitely. Three or four years of silence is roughly when the awkwardness barrier rises high enough to block re-initiation.

The cadence isn’t a rule about how often to text. It’s a rule about how long a relationship can go on goodwill alone before something has to top it up.

What counts as contact

Not all interaction maintains a relationship equally. Burke and Kraut (2016) at Carnegie Mellon found that passive consumption — liking posts, watching stories — does not produce the wellbeing effects of active connection. Active connection requires that the other person notice you noticed them.

What counts:

• A reply with a specific question
• A voice note about something they mentioned three weeks ago
• A call, even a five-minute one
• A photo sent with one sentence of context

What doesn’t:

• Likes
• Story views
• Generic “happy birthday” with no context
• Group-chat lurking

The asymmetry matters: the inner 5 need active contact. The outer 150 can survive on warm passive acknowledgement — a birthday wish with a sentence about a shared memory will land for someone you genuinely care about even if you haven’t spoken in eighteen months.

How to actually do this

The practical problem isn’t the cadence — it’s the bookkeeping. Nobody remembers when they last spoke with each of 150 people. The two reliable methods:

1. A weekly review. Fifteen minutes on Sunday evening to scan a list of names, flag who you’d like to reach out to, and write one message before bed. This works for the inner 5 and the close 15 because there are fewer than twenty people on that list.
2. A system of record. For the wider 50 and outer 150, memory fails. A personal CRM — or a notebook, or a spreadsheet — that tracks last-contact dates is the only thing that reliably surfaces “you haven’t spoken with Pablo in eight months and his daughter just started university.” A digital tool only matters insofar as it surfaces the right person at the right time.

Friendship Check-UpA 12-question reflection that surfaces which of your friendships are quietly cooling — without judgement.3 min

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A two-minute version of the same idea: the Friendship Check-Up tool walks you through a quick self-audit of which layer each of your closest people sits in, and which ones are currently drifting.

When cadence breaks

Three patterns to watch for:

• Inner 5 contact drops below weekly. This usually signals an external shift — new job, new baby, geographic move — rather than a cooling of the relationship. The repair is to name it: “Realised we haven’t really talked in a month. Coffee Thursday?”
• A close-15 friend starts feeling like a 50. This is normal layer drift. Either invest deliberately to pull them back, or accept the new layer and stop apologising for less frequent contact.
• An outer-150 friend you actively miss. This is the case for the Reconnect Generator — the specific situation where one message done well restores a relationship to its previous depth. Sandstrom and Boothby’s 2021 research is consistent: people are more pleased by unexpected reconnection than the sender expects.

A worked example

Consider a 35-year-old with a partner, two close friends from school, a tight three-person group from their first job, and roughly forty extended-family-and-friends contacts. That’s:

• Inner 5: partner + two school friends + two from work group
• Close 15: rest of work group + ten of the extended forty
• Wider 50: the remaining thirty extended-forty contacts

A workable rhythm: a meaningful daily exchange with the partner, a weekly call to each school friend, a monthly group chat with the work three, a one-on-one with each of the close 15 roughly every five weeks, and a quarterly nudge for the wider 50. That averages out to about three to five active contact moments per day across all layers — far less than feels obvious when you list it out.

The bottom line

There is no universally correct answer to how often you should check in. But there is a research-aligned floor for each Dunbar layer, and breaching that floor is usually what people mean when they say “we drifted.” The cadence isn’t about texting more — it’s about texting the right person at the right interval, with enough specificity that they know you actually noticed.

The single most underrated move is the once-a-year touch for the outer 150. It keeps thirty or forty old friendships alive at near-zero cost, and it’s the easiest thing to defer indefinitely. Pick a week each January, work through a list, and the back-catalogue takes care of itself.