Bitcoin Halving Countdown Calculator
Estimate the time and date of the next Bitcoin halving from the current block height, target block, and average block time. Educational, not investment advice. Runs in your browser.
Update from a block explorer for an accurate countdown.
Halvings: 840,000 (2024) · 1,050,000 · 1,260,000…
Bitcoin halves its block subsidy every 210,000 blocks (~4 years), cutting new issuance in half. Time-to-halving = (target − current block) × average block time. Because real block times vary around the 10-minute target, this is an estimate; enter the live block height for the best accuracy. The reward fell to 3.125 BTC at block 840,000 (April 2024) and will fall to 1.5625 BTC at block 1,050,000. Educational, not investment advice. Everything runs in your browser.
About this tool
The Bitcoin halving is a built-in event in Bitcoin's monetary policy that cuts the block subsidy — the new bitcoin paid to miners for each block — in half. It happens every 210,000 blocks, which at the protocol's roughly ten-minute target block time works out to approximately every four years. The schedule is deterministic: the subsidy started at 50 BTC, dropped to 25 in 2012, 12.5 in 2016, 6.25 in 2020, and 3.125 BTC at block 840,000 in April 2024; the next halving, at block 1,050,000, will reduce it to 1.5625 BTC. This calculator estimates how long until a chosen halving block by taking the difference between the target block and the current block height and multiplying by the average time per block. The reason it is an estimate, not a precise countdown, is that block times are not fixed at exactly ten minutes — they vary with mining hash rate and the difficulty adjustment, so the network runs slightly faster or slower than target for stretches. For the most accurate result, enter the live block height from a block explorer; the further out the halving, the more the estimate can drift. Halvings draw attention because they reduce the rate of new supply, and many observers track them closely, but past price behaviour around halvings is not a reliable guide to the future. This tool simply does the block-time arithmetic. It is educational and explicitly not investment advice. Everything runs in your browser; nothing is uploaded.
How to use it
- Enter the current Bitcoin block height (look it up on a block explorer for accuracy).
- Set the target halving block — 1,050,000 is the next one after the 2024 halving.
- Adjust the average block time if you want (10 minutes is the protocol target).
- Read the estimated time remaining, the approximate date, and the before/after block reward.
Frequently asked questions
- When is the next Bitcoin halving?
- The next halving occurs at block 1,050,000, when the block reward drops from 3.125 BTC to 1.5625 BTC. The exact date depends on how fast blocks are mined; enter the current block height to estimate it. It is expected around 2028.
- How is the halving countdown calculated?
- Time remaining = (target block − current block) × average block time. With a 10-minute average, 100,000 remaining blocks is about 1,000,000 minutes, or roughly 694 days.
- Why is the date only an estimate?
- Bitcoin targets a 10-minute block time but actual times vary with hash rate and the difficulty adjustment. Over months these small differences add up, so the predicted date shifts. Using the live block height keeps the estimate current.
- How often does the halving happen?
- Every 210,000 blocks, which at roughly 10 minutes per block is about every four years. Each halving cuts the block subsidy in half, slowing the rate of new bitcoin issuance.
- What was the block reward at each halving?
- 50 BTC at launch, 25 (2012), 12.5 (2016), 6.25 (2020), 3.125 at block 840,000 (April 2024), and 1.5625 at block 1,050,000 (next).
- Is this investment advice?
- No. This tool only performs the block-time arithmetic. Past market behaviour around halvings does not predict future results. Nothing is uploaded; all math runs in your browser.