Friendship Calculator

Romantic compatibility gets an enormous amount of attention and friendship compatibility gets almost none, which is a strange inversion. Most people will have more friends over a lifetime than partners, and the quality of those friendships has a substantial effect on how life feels day to day.

Friendships also fail differently. There is rarely a clean break. They thin out — fewer messages, longer gaps, a slow drift where you both stop being the person who reaches out. Nobody writes a song about it.

This tool exists mostly as an excuse to think about that drift before it finishes happening. The score is entertainment; the attention is the point.

Longitudinal thinking about friendship tends to land on a few recurring factors. Proximity matters more than people like to admit — most friendships that survive are the ones where seeing each other required no logistics. Shared history matters, which is why childhood friends persist even after you have nothing in common.

The third factor is reciprocity of initiation. Friendships die when one person is always the planner. It is rarely a decision; it is a slow accumulation of small asymmetries until the person doing the work quietly stops.

The fourth is forgiveness of change. People become different versions of themselves every few years. Friendships that last are the ones where both people keep re-deciding to be interested in whoever the other is becoming.

It is tempting to assume good friendships are built on shared interests, and shared interests certainly help early on. But the friendships that endure usually run on shared values rather than shared hobbies. Two people who both value directness will survive a disagreement about films. Two people who both love the same films but handle conflict differently often will not.

There is also a useful distinction between the friends who are fun and the friends who are safe. Both are worth having, and they are rarely the same person. Confusing the two is how people end up surrounded by company and still feel alone.

If a friendship scores low here, the honest question is not whether the number is right. It is whether the friendship is currently giving either of you anything, or whether you are both maintaining it out of inertia.

Not every friendship needs to be saved, and not every ending needs to be a confrontation. Many simply reach a natural conclusion: you moved cities, your schedules stopped overlapping, the shared context that produced the friendship went away.

That is not a failure. Treating it as one is what makes people hold on to connections that have stopped being nourishing, which drains energy that could go into the friendships that still are.

A reasonable test: if this person moved away tomorrow, would you make an effort to stay in touch? If the answer is immediately yes, invest. If it is a vague maybe, you already know.