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Bitcoin halving countdown — and the network behind it

The next halving happens at a block number, not a date. This page reads the live block height, counts the blocks to go and converts them to an estimate using the network’s actual current block time — then shows the fees, hashrate and difficulty that decide what mining looks like on the other side.

What the halving is

Bitcoin issues new coins only as block rewards, and the reward halves every 210,000 blocks. At ten minutes a block that is roughly every four years, which is why the halvings so far landed in 2012, 2016, 2020 and 2024. The schedule is written into the software: total supply approaches 21 million and the subsidy reaches zero around the year 2140, after which miners are paid by fees alone. The countdown above is the arithmetic of that rule applied to the block the network is on right now.

What it means for a trader — and what it does not

It means supply: after the fifth halving the network mints about 225 BTC a day instead of 450, roughly $17 million a day less new supply at a $75,000 price. It does not mean a date to buy. The halving is the best-known event in the asset’s calendar, priced by everyone who can read a block explorer, and the three previous cycles show rises that arrived with long lags and 50–80% drawdowns in between. Four data points do not make a law; a fixed supply schedule does make a fact. Trade the second, not the first.

For miners the halving is a cost shock: revenue per block halves overnight while electricity does not. That is why hashrate and the difficulty adjustment are on this page — they show whether the network absorbed the last cut, and fees show how much of a miner’s income is already coming from transactions rather than subsidy. The mechanics behind these numbers, and why they matter for price discovery, are in Lesson 5.

Questions people ask

What is the Bitcoin halving?

Every 210,000 blocks — roughly four years — the reward paid to miners for each new block is cut in half. It started at 50 BTC in 2009, fell to 25 in 2012, 12.5 in 2016, 6.25 in 2020 and 3.125 in April 2024. The next cut, to 1.5625 BTC, happens at block 1,050,000.

When is the next Bitcoin halving?

Nobody knows the date exactly, because blocks arrive on average every ten minutes but not on a schedule. This page counts the blocks remaining from the live block height and converts them to a date using the current average block time, so the estimate moves as the network does.

Does the halving make the price go up?

It reduces new supply — after 2028 about 225 BTC a day instead of 450 — but it does not create demand, and it is the most widely known event in the market, which means it is priced in by people who trade it years ahead. Past halvings were followed by rises with long lags and big drawdowns in between; four data points are not a law. The lesson to take is about supply, not timing.

What are the fee numbers?

The fee in satoshis per virtual byte that mempool.space currently recommends for confirmation in the next block, within 30 minutes and within an hour, converted to dollars for a typical 140-vB transaction at the live price. Fees are what miners earn once the subsidy is small.

What is the difficulty adjustment?

Every 2,016 blocks the network re-tunes how hard mining is so blocks keep arriving about every ten minutes regardless of hashrate. The progress bar shows how far through the current 2,016-block window we are and the change the next adjustment is expected to make.

Data: mempool.space public API (block height, recommended fees, hashrate, difficulty adjustment), fetched by your browser every 60 seconds; BTC price from the site’s live stream. Dates for past halvings are block timestamps in UTC.