Bitcoin Difficulty History: Every Retarget Since Genesis (Data + API)
The complete Bitcoin difficulty-adjustment time series — every retarget since 2009 with percent change and implied hashrate.
Quick answer
Bitcoin has had 459 difficulty retargets since 2009. The current difficulty is 124.93T (epoch ending block 953,568), implying ~894.3 EH/s of network hashrate. The largest single-retarget drop on record was -27.94% (e.g. the 2021 China mining ban era). Difficulty adjusts every 2,016 blocks (~2 weeks) to hold ~10-minute blocks.
The complete series — every epoch, difficulty, % change and implied hashrate — is free to download (CSV/JSON) and query via API under CC BY 4.0.
Download CSV (459 epochs) Download JSON REST API →
Most recent retargets
| Date | Height | Difficulty | Change | Implied hashrate | Avg block |
|---|---|---|---|---|---|
| 2026-06-14 | 953,568 | 124.93T | -10.09% | 894.3 EH/s | 11.13 min |
| 2026-05-29 | 951,552 | 138.96T | +1.72% | 994.68 EH/s | 9.84 min |
| 2026-05-15 | 949,536 | 136.61T | +3.12% | 977.87 EH/s | 9.7 min |
| 2026-05-02 | 947,520 | 132.47T | -2.3% | 948.27 EH/s | 10.24 min |
| 2026-04-17 | 945,504 | 135.59T | -2.43% | 970.63 EH/s | 10.25 min |
| 2026-04-03 | 943,488 | 138.97T | +3.87% | 994.76 EH/s | 9.63 min |
| 2026-03-20 | 941,472 | 133.79T | -7.76% | 957.73 EH/s | 10.85 min |
| 2026-03-05 | 939,456 | 145.04T | +0.45% | 1038.25 EH/s | 9.96 min |
| 2026-02-19 | 937,440 | 144.4T | +14.73% | 1033.64 EH/s | 8.72 min |
| 2026-02-07 | 935,424 | 125.86T | -11.16% | 900.97 EH/s | 11.26 min |
| 2026-01-22 | 933,408 | 141.67T | -3.28% | 1014.1 EH/s | 10.34 min |
| 2026-01-08 | 931,392 | 146.47T | -1.2% | 1048.49 EH/s | 10.13 min |
| 2025-12-25 | 929,376 | 148.26T | +0.04% | 1061.28 EH/s | 10 min |
| 2025-12-11 | 927,360 | 148.2T | -0.74% | 1060.82 EH/s | 10.07 min |
| 2025-11-27 | 925,344 | 149.3T | -1.95% | 1068.74 EH/s | 10.2 min |
| 2025-11-12 | 923,328 | 152.27T | -2.37% | 1090 EH/s | 10.25 min |
| 2025-10-29 | 921,312 | 155.97T | +6.31% | 1116.5 EH/s | 9.41 min |
| 2025-10-16 | 919,296 | 146.72T | -2.73% | 1050.23 EH/s | 10.3 min |
| 2025-10-01 | 917,280 | 150.84T | +5.97% | 1079.75 EH/s | 9.44 min |
| 2025-09-18 | 915,264 | 142.34T | +4.63% | 1018.93 EH/s | 9.56 min |
| 2025-09-05 | 913,248 | 136.04T | +4.89% | 973.81 EH/s | 9.55 min |
| 2025-08-22 | 911,232 | 129.7T | +0.2% | 928.42 EH/s | 10 min |
| 2025-08-08 | 909,216 | 129.44T | +1.42% | 926.53 EH/s | 9.87 min |
| 2025-07-26 | 907,200 | 127.62T | +1.07% | 913.54 EH/s | 9.9 min |
Showing the 24 most recent of 459 retargets; download the full series above. Implied hashrate is derived from difficulty (D×232/600) — a deterministic estimate, not a measured value. Source: mempool.space.
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Last reviewed June 18, 2026.