A halving (also called a halvening) is a pre-programmed event built into Bitcoin's protocol that reduces the mining reward by 50%. This event occurs approximately every four years, or more precisely, every 210,000 blocks.
When Bitcoin launched in 2009, miners received 50 BTC for each block they mined. After the first halving in 2012, the reward dropped to 25 BTC. Subsequent halvings reduced it to 12.5 BTC (2016), 6.25 BTC (2020), and 3.125 BTC (2024). This process will continue until all 21 million Bitcoin have been mined, estimated around the year 2140.
The halving matters for several important reasons:
- Supply reduction — fewer new coins enter circulation, creating scarcity
- Inflation control — Bitcoin's inflation rate decreases with each halving
- Price impact — reduced supply with steady or growing demand has historically preceded major bull markets
- Miner economics — miners earn less per block, forcing less efficient operators to shut down
Historically, each halving has been followed by a significant price increase within 12-18 months, though past performance does not guarantee future results. The halving is a key part of Bitcoin's deflationary monetary policy, which contrasts sharply with traditional fiat currencies that can be printed without limit.
The halving is central to understanding Bitcoin's value proposition and is often discussed alongside Bitcoin ETFs and broader market analysis. To learn more about Bitcoin's evolving ecosystem, explore our guide on Bitcoin Layer 2 solutions.