Pi Cycle Top tracks the gap between Bitcoin's 111-day moving average and 2× its 350-day moving average. When the shorter average rises to meet the longer one, it has historically landed within days of major cycle tops. It's a lagging confirmation signal, not a predictive one — useful for risk management, not precise timing.
What Is Pi Cycle Top?
Pi Cycle Top is built entirely from price — no on-chain data required — which is part of why it's so widely referenced. It compares two moving averages of very different lengths: a relatively short 111-day average, and a much longer 350-day average multiplied by two. As long as the 111-day average sits comfortably below the doubled 350-day average, the indicator reads calm. As Bitcoin's price accelerates late in a bull run, the shorter average rises faster and closes the gap — and when the two lines actually cross, that crossover has repeatedly coincided with major cycle tops.
The Math Behind It
The two components:
111-day moving average (111DMA). A relatively short-term trend line — reactive enough to accelerate quickly when price is surging.
350-day moving average × 2 (350DMA×2). A much longer trend line, doubled. Because it averages nearly a full year of price action, it moves far more slowly. Doubling it sets a high bar that only a genuinely extended price surge can close.
The indicator's live reading, as shown on our Pi Cycle page, expresses how close the 111DMA is to crossing the 350DMA×2 as a percentage — the closer to 100%, the closer the two lines are to actually crossing.
Why "Pi" Cycle?
The name is a nod to the mathematical constant π (~3.14159). The ratio between the two moving average windows used — 350 days and 111 days — works out to approximately π when you account for how the two lines have historically crossed relative to the cycle's overall length. It's a memorable naming choice more than a deep mathematical claim, but it's stuck because the indicator itself has proven genuinely useful.
Its Track Record
What makes Pi Cycle Top stand out among cycle-top indicators is consistency: across multiple Bitcoin cycles, the 111DMA/350DMA×2 crossover has occurred within roughly a few days of the eventual cycle peak, each time. That's a notably tight track record for something built from nothing more exotic than two moving averages.
It's worth being precise about what that track record actually shows, though — it means the crossover has historically appeared close in time to the peak, not that it identifies the exact top in advance. By the time the lines actually cross, price is typically already at or very near its high for the cycle.
Reading the Live Indicator
| Reading | Zone | Historical Interpretation |
|---|---|---|
| Below 34% | Deep Value | 111DMA far below 350DMA×2 — well away from a top signal |
| 34% – ~85% | Fair Value | Averages still comfortably separated, no signal close |
| ~85% – 100% | High Risk | 111DMA closing in on 350DMA×2 — momentum becoming extended |
| 100%+ (crossover) | Top Risk | The crossover has occurred, or is imminent — historically near overheated conditions |
Check today's live reading on the Pi Cycle indicator page.
Limitations
It's a lagging confirmation tool, not a prediction. The crossover tends to happen at or very near the top — it doesn't give meaningful advance warning before price has already peaked.
It has no opinion on bottoms or mid-cycle moves. Pi Cycle Top is purpose-built around one specific event. It says nothing useful about accumulation zones or ordinary volatility outside of that context.
A crossover that doesn't happen isn't a guarantee either. Bitcoin's price behaviour could change enough in a future cycle that this specific moving-average relationship no longer plays out the same way. A strong historical pattern is not a law.
How to Use It
Pi Cycle Top is most useful as one input in a broader risk-management process, not a standalone sell trigger. As the reading climbs toward the crossover, it's a reasonable cue to review position sizing and take some risk off the table incrementally, rather than waiting for the exact cross to act. Cross-check it against other cycle-stage indicators — Puell Multiple and the 200-Week Moving Average pair well with it, since all three look at cycle position from different angles.
It's also one of the 21 inputs to our Cycle Compass composite score, which weighs it alongside indicators covering valuation, sentiment, and holder behaviour.
For a broader tour of the other major indicators worth knowing, see our guide to 10 On-Chain Bitcoin Indicators Every Investor Should Know.