What your cognitive percentile actually means
“Top 10%” sounds dramatic. “Below average” can sting. But a percentile isn't a grade or a diagnosis — it's simply your position in a line-up. The whole trick to reading it well is knowing exactly who's standing in that line next to you.
A percentile is a position, not a score
If you're in the 80th percentile, it means roughly 80% of the players you're being compared with scored at or below you, and about 20% scored higher. That's all it is — a ranking, not a measure of how “good” the underlying number is in any absolute sense. Two people with the very same Brain Fitness Index can land in different percentiles, simply because they're measured against different crowds.
Why we compare you to your own age group
That crowd matters enormously, which is why CogDojo compares you within your own age bracket rather than against everyone at once. Comparing a 19-year-old to a 62-year-old on raw speed isn't a fair fight, and it isn't a useful one either — it tells you about age, not about your training. By bracketing, your percentile answers a sharper question: how is my training going relative to people in roughly my stage of life?When you climb, you know it's because you improved — not because your comparison group quietly got easier.
Your percentile can move even on a day you don't play, because the people around you are training too. That's the point of a peer comparison — it's a living line-up, not a frozen scoreboard.
How to read each band
Rather than make you stare at a bare number, we group percentiles into six plain-language bands. Here's exactly where each one sits:
Your training score sits in the top tenth of players in your age bracket.
Comfortably above the middle of your age group.
Right around the middle — where most players sit, by definition.
Below the middle of your bracket, with clear room to climb.
In the lower tenth for now — the easiest place to make fast, visible gains.
We don't have enough of your sessions — or enough peers in your bracket — to place you fairly yet.
What “Calibrating” means
If you're brand new, or you're training in a bracket that doesn't have many other players yet, you'll see Calibratinginstead of a band. That's deliberate honesty: we'd rather say “not enough data yet” than place you against a handful of people and pretend it's meaningful. Keep playing, and once there's enough signal — from you and from your peers — your real band appears.
Read it, don't over-read it
A percentile is a useful nudge — it tells you whether your training is ahead of, around, or behind your age group, and it makes climbing feel like it counts. But it ranks how you do on CogDojo's games against other CogDojo players. It is not a clinical assessment of your cognition, it doesn't measure your real-world ability, and it isn't a health screen. Use it the way it's meant: as a friendly marker on a journey you can watch yourself move along.