The Bitcoin supply schedule,
from genesis to 2140.

This tool runs entirely in your browser: no data is sent to any server. On load it reads the site's own /data/btc-tip.json file for the last recorded chain tip: its height (tipHeight) and the time it was recorded (tipHeightAt), taken from mempool.space's block-height API^[3]. The file is refreshed with each site data update, and the height in use appears next to the estimated date. No price enters any figure below.

Protocol constants come from Bitcoin Core: a 50 BTC starting reward, a halving every 210,000 blocks and a 10-minute block target^[4]. The reward is cut by a bit shift, so it reaches zero at the 33rd halving, block 6,930,000^[5].

• Current block = tipHeight + whole 10-minute intervals since tipHeightAt. If the file fails to load, or its tip is not a valid height and time later than block 840,000, the tool uses block 840,000 (mined 2024-04-20 00:09:27 UTC^[3]) as the tip instead, which ran about 600 blocks behind the real chain in September 2026. On a clock set before the tip time, the height is interpolated as on the chart.
• Next halving = the next multiple of 210,000 above the current block, through the 33rd at block 6,930,000. Countdown = (next halving block - tipHeight) × 600 seconds - time since tipHeightAt, updated every second. Estimated date = tipHeightAt + (next halving block - tipHeight) × 600 seconds. In the table, halving blocks 210,000 to 840,000 show the UTC dates they were mined; later halvings show estimates from the same formula, marked ~.
• Halvings completed = current block ÷ 210,000, rounded down. Current reward = 50 BTC halved once per completed halving, and zero from the 33rd.
• Mined = 210,000 × reward for each finished era + (current block - era start) × current reward. Remaining = 21,000,000 - mined.
• The supply chart plots supply on January 1 of every fourth year from 2009 to 2137, plus 2140. Up to the last known point, the block height on that date is interpolated linearly between observed block times: genesis (2009-01-03 18:15:05 UTC^[4]), halving blocks 210,000 to 840,000^[3] and the snapshot chain tip, which lands within 1,000 blocks of the real height on each plotted date through 2025. Later dates advance one block per 10 minutes.

Rewards are treated as exact fractions; Bitcoin Core rounds each down to whole satoshis, so real issuance ends near 20,999,999.9769 BTC. Lost coins are not subtracted, and real block times drift from the 10-minute target, which moves the actual halving date.

Verify the methodology or inspect the source code in your browser's dev tools.