Firsthand Bitcoin · Data · Bitcoin miners
Data / Difficulty adjustments / 2021
The size of every bitcoin difficulty retarget, as a percentage.
Difficulty adjustment opened 2021 at +10.79% (January 9, 2021) and closed at +0.32% (December 25, 2021), down 97.1%. The high was +21.53% on May 13, 2021 and the low -27.94% on July 3, 2021.
| Month | Month end |
|---|---|
| January 2021 | +1.05% |
| February 2021 | +1.35% |
| March 2021 | +1.95% |
| April 2021 | +1.92% |
| May 2021 | -15.97% |
| June 2021 | -5.30% |
| July 2021 | +6.03% |
| August 2021 | +13.24% |
| September 2021 | +3.16% |
| October 2021 | +7.85% |
| November 2021 | -1.49% |
| December 2021 | +0.32% |
Each bar is one retarget. Most are small and upward, because hashrate keeps growing. The large negative ones mark the moments miners switched off in numbers: China’s mining ban in mid-2021 produced the biggest cut in bitcoin’s history, −28%.
Other years: 2026 · 2025 · 2024 · 2023 · 2022 · 2020 · 2019 · 2018 · 2017 · 2016 · 2015 · 2014 · 2013
Also in 2021: Bitcoin price · Distance from the all-time high · 200-day and 200-week averages · Network hashrate · Mining difficulty · Fees paid to miners · Transactions per day · Hashprice · Miner revenue · Bitmain releases and the bitcoin price · Break-even electricity price · What a bitcoin costs us to mine, against the market