Roughly every four years, the reward for mining a Bitcoin block is cut in half. It is written into the code, it has happened four times, and it will keep happening until around 2140. This tracker reads the live block height straight from the network and counts down to the next one.
What the halving is
Bitcoin issues new coins as a reward to miners for each block. That reward started at 50 BTC in 2009. Every 210,000 blocks — about four years at ten minutes per block — it halves. 2012 cut it to 25. 2016 to 12.5. 2020 to 6.25. 2024 to 3.125. The next brings it to 1.5625, and so on until the reward rounds to zero somewhere around 2140, at which point all 21 million Bitcoin will exist and miners will earn from transaction fees alone. This is the entire monetary policy. There is no committee, no vote, no adjustment for economic conditions. The supply schedule was fixed in 2009 and has executed without deviation ever since — which is precisely the point.
The math
Halving Interval = 210,000 blocks
Block Time ≈ 10 minutes (target)
Era = floor(Current Block ÷ 210,000)
Reward = 50 ÷ 2^Era
Next Halving = (Era + 1) × 210,000
Blocks Left = Next Halving − Current Block
Est. Time = Blocks Left × 10 minutesThe date is an estimate, not a schedule. Blocks target ten minutes but arrive faster when hashrate grows and slower when it falls. Difficulty readjusts every 2,016 blocks to pull the average back to ten minutes.
Understanding the halving
- 1The countdown date will drift. Blocks have historically come slightly faster than ten minutes as hashrate grows, so estimates tend to pull earlier over time. Watch the block height, not the date.
- 2Halvings are known years ahead. The idea that a fully public, perfectly predictable event is unpriced by markets deserves scepticism — everyone can see it coming.
- 3The effect on miners is immediate and brutal: revenue halves overnight while costs do not. Inefficient miners shut down, hashrate drops, difficulty adjusts, and the survivors take a larger share.
- 4Historically, price rose in the year following each halving. That is four data points across four completely different market environments. It is a pattern, not a law, and four is not a sample size.
- 5After the final halving around 2140, miners earn only transaction fees. Whether fees alone can secure the network is genuinely unresolved and one of Bitcoin's most interesting long-term questions.
Frequently asked questions
When is the next halving?
The tracker above calculates it live from the current block height. The estimate assumes ten-minute blocks, so it shifts as actual block times vary. The block number is fixed and certain; the date is a projection.
Why does Bitcoin halve at all?
To create scarcity on a fixed schedule. A gradually decreasing issuance rate means the supply approaches 21 million asymptotically and never exceeds it. It also distributes coins over more than a century rather than all at once.
Does the halving make the price go up?
Historically, price rose in the year after each of the four halvings. But four events is not a dataset, each occurred in a wildly different macro environment, and correlation across four points proves nothing. Anyone stating this as certainty is selling something.
What happens to miners?
Their revenue halves overnight while electricity costs stay identical. Miners running old hardware or paying high power prices become unprofitable and shut down. Hashrate drops, difficulty adjusts downward within two weeks, and the remaining miners earn more per block.
Is this data live?
Yes. The block height is fetched directly from the Bitcoin network and refreshes every minute. The reward, blocks remaining, and cycle progress are all calculated from that live height rather than a stored value.