The 4-Year Cycle model places Bitcoin's current phase — Bull Market, Euphoria, Bear Market, or Recovery — based purely on how many weeks have passed since the most recent halving. It's the only indicator on this site built entirely from the calendar rather than price or on-chain data.
What Is the 4-Year Cycle?
Bitcoin has repeated a broadly similar rhythm across every cycle so far: a halving event, followed by an expansion phase, a euphoric blow-off, a decline, and eventually a recovery that leads into the next halving. The 4-Year Cycle indicator formalizes that observed rhythm into four named phases, mapped directly to how many weeks have elapsed since the last halving — no price data required at all.
Why Halvings Drive the Rhythm
Roughly every four years, Bitcoin's block reward — the rate at which new coins are issued to miners — is cut in half. This is hard-coded into the protocol and happens on a predictable schedule tied to block count, not calendar time (which is why halvings land on slightly different dates each cycle, even though the interval is consistently close to four years).
Each halving is a genuine, mechanical supply shock: the rate of new Bitcoin entering circulation drops overnight. Historically, this supply reduction — combined with demand that doesn't necessarily fall at the same time — has been a major structural driver behind the recurring cycle pattern, even though it's far from the only factor at play.
The Four Phases
| Phase | Timing | Historical Interpretation |
|---|---|---|
| Bull Market | Weeks 0–68 after halving | Post-halving expansion window — often stronger momentum as supply issuance falls |
| Euphoria | Weeks 68–80 after halving | Late-cycle window where optimism intensifies — major peaks have often formed near here, though not precisely on schedule |
| Bear Market | Weeks 80–135 after halving | Post-peak decline and accumulation window — the more attractive opportunity has historically appeared later in this phase |
| Recovery | Week 135 to next halving | Market moves out of the bear window toward the next halving — often an attractive period for steady accumulation |
See today's live phase and week count on our 4-Year Cycle indicator page.
Why It's a Rhythm, Not a Clock
It's important to be precise about what this model claims: it describes a historical rhythm, not a precise, guaranteed schedule. The phase boundaries (week 68, week 80, week 135) are calibrated from how prior cycles have actually unfolded — they're a genuinely useful reference for "roughly where we'd expect to be," not a countdown clock that promises a peak or bottom on an exact week.
Every past cycle has varied somewhat around this rhythm — sometimes running a bit long, sometimes compressing. The model captures the recurring pattern, not a mechanical certainty.
Limitations
It says nothing about price. Because it's built purely from the calendar, the 4-Year Cycle model has zero awareness of what price is actually doing — it will confidently state "Euphoria" or "Bear Market" regardless of whether price actually behaves that way in a given cycle.
Four data points is a small sample. Bitcoin has only completed a handful of full halving cycles so far. A pattern observed across three or four repetitions is a meaningfully smaller sample than most other indicators on this site are calibrated against.
Market structure keeps evolving. Spot ETFs, institutional treasuries, and sovereign holders are all relatively new forces that didn't exist in earlier cycles — there's a real, open question about whether they'll stretch, compress, or otherwise reshape the historical rhythm going forward.
How to Use It
The 4-Year Cycle model is best used as a broad orientation tool — a reminder of roughly where the market has tended to be at this point in past cycles — rather than a standalone trading signal. Its real value comes from cross-checking it against indicators that actually measure current conditions: if the calendar says "Bear Market" and MVRV Z-Score, Supply in Profit, and Drawdown from ATH all agree that price looks historically stretched or discounted accordingly, that alignment between the calendar-based rhythm and the data-based indicators is far more meaningful than the calendar alone.
It's also one of the 21 inputs to our Cycle Compass composite score.
For a broader tour of the other major indicators worth knowing, see our guide to 10 On-Chain Bitcoin Indicators Every Investor Should Know.