The Halving Cycle
Bitcoin's protocol cuts the block reward in half approximately every 210,000 blocks (~4 years). This halving reduces the rate at which new bitcoins enter circulation, cutting the annual inflation rate in half.
Historical halvings:
| Halving | Date | Block Reward | Price at Halving | Price ~18 months later |
|---|---|---|---|---|
| H1 | Nov 2012 | 25 BTC | ~$12 | ~$1,000 (+8,233%) |
| H2 | Jul 2016 | 12.5 BTC | ~$650 | ~$19,500 (+2,900%) |
| H3 | May 2020 | 6.25 BTC | ~$8,500 | ~$69,000 (+712%) |
| H4 | Apr 2024 | 3.125 BTC | ~$63,000 | ~$97,000 (+54%) |
Notice the diminishing returns: each halving-cycle bull run has produced smaller percentage gains. This is consistent with the Power Law model — as Bitcoin matures, its growth rate decelerates.
The 5th Halving (H5): May 2028
The 5th halving is expected around May 2028 (exact block height: 1,050,000). At this point:
- Block reward drops to 1.5625 BTC
- Annual inflation falls to approximately 0.4%
- Stock-to-Flow ratio reaches ~250 (vs gold at ~60)
What the Models Say
Power Law Model
The Power Law's median price in May 2028 is approximately $175,000. The 68% confidence interval (±1σ) spans roughly:
- Lower bound (−1σ): ~$70,000
- Median: ~$175,000
- Upper bound (+1σ): ~$440,000
The model predicts the halving itself is not a direct catalyst — rather, it's the long-term time trend that drives price. The halving coincides with a particular point along the power law curve, but price may be anywhere within the corridor at that moment.
The 2024 halving (H4) illustrates this well: Bitcoin was already near the median at ~$63,000 at the halving date, and while it did reach ~$97,000 in late 2024, it remained within the expected ±1σ corridor throughout.
Stock-to-Flow Model
The S2F model predicts a much more dramatic response to H5. After H5, SF reaches ~250 and the model projects:
- S2F median: ~$800,000–$1,200,000 (highly uncertain at this stage)
This is based on the extrapolation of the same exponential relationship between SF and market cap. However, the model's out-of-sample performance has weakened since 2021, and many researchers consider these projections overstated.
Exponential (CAGR) Model
The Exponential model fits a constant compound annual growth rate to Bitcoin's history:
- CAGR: approximately 85% over 2010–2015, declining to ~50% over 2010–2020, and further declining
- Using a long-term CAGR of
40%: **$250,000** by end of 2028
The exponential model tends to overshoot in bear markets and undershoot at mature stages.
Pattern Recognition vs. Prediction
It's worth distinguishing between pattern recognition and prediction:
The Power Law model has recognized a consistent long-term corridor. Projecting it forward assumes this corridor continues. That's a reasonable starting assumption — but it's not certainty.
Key uncertainties for 2028:
- Macro environment — interest rate cycles, dollar strength, equity correlations
- Regulatory environment — especially in the US and EU
- ETF and institutional flows — the 2024 Bitcoin ETF approvals changed institutional access significantly
- Layer 2 adoption — Lightning Network growth may affect on-chain value metrics
A Realistic Range
Synthesizing the models with historical cycle analysis, here is a scenario framework (not a prediction) for the period around H5:
| Scenario | Context | Price Range |
|---|---|---|
| Bear / deep | Global recession, regulatory shock | $50k–$100k |
| Base case | Normal cycle, moderate adoption | $100k–$300k |
| Bull | Strong institutional inflow, new demand catalysts | $300k–$600k |
| Extreme bull | S2F-type scenario, adoption accelerates | $600k–$1.2M |
Conclusion
The 2028 halving will reduce new Bitcoin supply to 1.5625 BTC per block. Historical precedent and mathematical models both suggest continued long-term appreciation — but with wide uncertainty bands.
The Power Law model's ±1σ corridor spans a 6× range around the median for that year, reflecting genuine uncertainty. The model tells us where the trend points, not where price will be.
The most sensible framework: understand the models, respect the uncertainty, and never invest more than you can afford to lose.
Disclaimer: This article is for educational purposes only. It is not financial advice. No price predictions should be relied upon for investment decisions.