Bitcoin halving occurs every 210,000 blocks (~4 years). See current block height, blocks to next halving, and projected reward.
Blocks to next halving
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Current block reward
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Next reward
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Your annual BTC (current era)
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USD value (current price)
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Your breakdown
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The supply schedule that never changes
Bitcoin's issuance is not set by a committee or a central bank. It is fixed in the protocol. Every block adds new coins to the miner who solves it, and every 210,000 blocks that reward is cut in half. Because the network targets one block roughly every ten minutes, 210,000 blocks works out to close to four years. This tool reads your current block height, figures out which reward era you are in, and counts the blocks left until the next cut. That is the honest way to time a halving, because calendar predictions drift every time block production runs fast or slow.
Each era divides the original 50 BTC reward by a power of two. At block 930,000 you are in era 4, which means the reward has already been halved four times: 50, then 25, then 12.5, then 6.25, and now 3.125 BTC per block. The next halving drops it to 1.5625 BTC. There is no discretion here. Miners cannot lobby for more, and holders cannot vote for less.
Counting down from block 930,000
Plug in the default block height of 930,000 and the math falls out cleanly. Era 4 ends at block 1,050,000, because that is era 5 multiplied by 210,000. Subtract your current height and you have 120,000 blocks to go. At the network's long-run average of about 144 blocks per day, that is roughly 833 days, or about 2.28 years away. The tool also estimates how much you would earn if you controlled a sliver of the network: at a 0.001 percent hashrate share you would expect to mine about 0.5256 blocks a year, which at the current 3.125 BTC reward is roughly 1.6425 BTC. At a price of $68,000 that comes to about $111,690 of annual block income before electricity and hardware.
Halvings drawn to scale
The chart below shows the block reward stepping down across the eras. Notice how the cuts compress: the first drop removed 25 BTC of issuance per block, while the upcoming one removes only about 1.56. New supply is asymptoting toward zero.
Who should pay attention to the countdown
This calculator is built for two kinds of people. The first is the miner or mining-pool operator who needs to know exactly when revenue per block falls by half, because that is the moment when older hardware can flip from profitable to unprofitable overnight. A practical tip from people who run rigs: do not wait for the halving to model your breakeven electricity price. Run the numbers now at the post-halving reward of 1.5625 BTC, and if your machines only clear their power bill at today's 3.125 reward, you are already living on borrowed time. The second audience is the long-term holder watching the supply story, since the stock-to-flow narrative leans heavily on these scheduled cuts.
One common mistake is treating the four-year cadence as a precise clock. It is not. The protocol counts blocks, not days, and when hashrate surges blocks arrive faster than ten minutes apart, pulling the date earlier. That is why a block-based countdown beats any fixed date. Remember too that mined BTC is taxable: the IRS treats block rewards as ordinary income at the coin's fair market value on the day you gain control of it, reported as you would other self-employment or hobby income, and that same value becomes your cost basis for a later sale.
Does the halving guarantee the price goes up?
No. Halvings cut the rate of new supply, which historically has preceded large price moves, but supply is only one side of the equation and demand can fall faster than issuance shrinks. Past cycles are not a promise. Treat the halving as a known supply event, not a buy signal.
What happens when all the rewards run out?
Around the year 2140 the block reward will round down to zero, after roughly 64 halvings, capping total supply near 21 million coins. At that point miners earn only transaction fees. Long before then the subsidy becomes negligible, which is why fee revenue and transaction demand matter more with every era that passes.
How accurate is the 144 blocks per day figure?
It is a long-run average, not a daily constant. The network adjusts mining difficulty every 2,016 blocks to pull the average back toward one block every ten minutes, which is 144 a day. Over weeks the figure holds up well, but on any single day actual block counts swing above and below it.