Counted in blocks, not guessed from a date
Every 210,000 blocks the reward paid to miners is cut in half. The rule is fixed in the protocol, so the exact block is known years ahead — block 1,050,000, then 1,260,000, and so on. What is not known is when those blocks arrive. This page reads the current chain height and counts the blocks remaining, so the countdown stays correct as the network speeds up or slows down.
Turning blocks into a date needs an assumed block time, and that assumption is where countdowns diverge. Ten minutes is the target the difficulty adjustment aims at every 2,016 blocks, not what actually happens: real averages drift either side of it for weeks at a time. So rather than picking one number and presenting it as the answer, this page shows the estimate under the current epoch's measured average, the last fifteen blocks, and the theoretical ten minutes — and how far apart they are.
There is deliberately no price prediction attached to the event. Bitcoin has had four halvings. Any claim about what happens to the price afterwards rests on four observations, each in a completely different market, and four points cannot separate a halving effect from everything else going on at the time. The countdown is a fact; the narrative around it is not.
⚠️ Not investment advice. Block height comes from a public explorer and estimated dates depend on an assumed block time that will not hold exactly. All decisions and risks are your own.
It happens at a fixed block height rather than on a date — every 210,000 blocks. This page counts the blocks remaining from the live chain height and converts them to an estimated date, so the countdown stays correct as the network speeds up or slows down.
Because converting blocks to a date requires assuming a block time, and blocks do not arrive exactly every ten minutes. Ten minutes is the target the difficulty adjustment aims at, not the observed rate, which drifts either side of it for weeks. Different assumptions move the estimate by days or weeks.
The average across the current difficulty epoch, because it uses the largest sample. A fifteen-block average swings widely and is shown only to make the short-run variation visible. The honest reading is a range rather than any single date.
The reward paid to miners for each block is cut in half, which halves the rate at which new bitcoin enters supply. That is the entire mechanism. It is scheduled in the protocol and has followed the same rule since 2009.
Because Bitcoin has had four halvings, and any claim about what the price does afterwards rests on those four observations, each embedded in a completely different market. Four points cannot separate a halving effect from everything else happening at the time.
After the 33rd halving the reward rounds to zero in satoshi terms, which is what caps total supply near 21 million. On the current schedule that is well over a century away, and miners are expected to be paid by transaction fees long before then.