Bitcoin’s halving schedule
- 2009 — block 0: 50 BTC per block.
- 2012 — block 210,000: 25 BTC.
- 2016 — block 420,000: 12.5 BTC.
- 2020 — block 630,000: 6.25 BTC.
- 2024 — block 840,000: 3.125 BTC.
- ~2028 — block 1,050,000: 1.5625 BTC.
- Continues halving approximately every 4 years until block subsidy effectively reaches zero around 2140.
The total cap of 21 million BTC emerges from this geometric series: the sum of all halvings converges to ~21M. The last satoshi will be mined around 2140; after that, miners earn only transaction fees.
Why halvings matter
- Supply shock — new issuance drops by 50% overnight. If demand stays constant, price should rise.
- Miner economics compressed — every halving cuts block-subsidy revenue in half; miners with marginal economics become unprofitable unless price rises or efficiency improves.
- Narrative / Schelling point — the halving is a universally-known event. Markets anticipate it; narratives cluster around it.
Historical price action around halvings
| Halving | Price at halving | ~12 mo later peak | Peak multiple |
|---|---|---|---|
| 2012 | $12 | ~$1,100 | 90x |
| 2016 | $650 | ~$20,000 | 30x |
| 2020 | $8,800 | ~$69,000 | 8x |
| 2024 | $64,000 | TBD | TBD |
Each cycle has produced smaller multiples as BTC’s market cap has grown. 2020’s cycle peaked at 8x; 2024-2025’s is expected to produce a lower multiplier still — though “lower multiple on higher base” still means meaningful dollar appreciation.
Note the sample size is small (4 halvings), the counter-argument is vocal (“just cycle pattern matching”), and the most recent cycle (2024) played out differently than previous ones — spot-ETF flows and institutional entry altered the shape of the rally.
Halvings on other PoW chains
Most PoW chains inherit Bitcoin’s halving mechanism:
- Litecoin — halves every 840,000 blocks (~4 years). Most recent: 2023.
- Bitcoin Cash, Bitcoin SV — inherit Bitcoin’s schedule.
- Dogecoin — originally had halvings; switched to flat 10,000 DOGE per block in 2014. No more halvings.
Ethereum has no halving — the Merge replaced PoW issuance with PoS issuance (which is different and algorithmic, not halving-based).
Risks and considerations
- “Priced in” argument — every halving is known in advance, yet markets rally after it anyway. The efficient-markets argument that halvings are priced in has been wrong 3 times. Each cycle still surprises.
- Miner capitulation — post-halving, some miners unplug. Hashrate can drop 10-20% transiently before efficiency-and-price improvements pull it back.
- Fee dependency — as block subsidy approaches zero over future halvings, transaction fees must grow to sustain miner revenue. Whether this will hold is an open debate for post-2040 bitcoin economics.
- Bear-market halvings — the 2024 halving happened in the middle of a bull market; previous halvings (2012, 2016) happened closer to cycle lows. Timing shift matters for post-halving dynamics.
For holders: halvings are a multi-year catalyst. Their effect unfolds over quarters, not days. For miners: halving is the periodic test that weeds out inefficient operators and rewards the ones with cheapest power and best hardware.