Bitcoin difficulty rises 5.92%: what it means for miner revenue
Explainer · Mining desk · Published 17 October 2026 · By TradeSignalsHQQuick answer. On 16 October 2026, at block 971,712, Bitcoin's mining difficulty rose 5.92% to about 140.58 trillion, because blocks had been arriving faster than every ten minutes. With price and fees unchanged, each unit of hashing power now earns about 5.6% less bitcoin, which squeezes miners with high electricity costs first.
Difficulty adjustments happen every two weeks or so and usually move a few percent either way. This one was large enough to matter for miners' daily income. Below we explain why it happened, what it does to the revenue of a typical machine, and what it does not tell you. It is educational only and is not advice to buy, sell or mine bitcoin.
What changed on 16 October 2026?
Block 971,712, mined at 12:37 UTC on 16 October, started a new difficulty period. Chain data published by mempool.space shows the difficulty moving from about 132.72 trillion to about 140.58 trillion, a rise of 5.92%. The previous adjustment, at block 969,696 in early October, had been almost flat at −0.03% (mempool.space hashrate and difficulty; block 971,712).
Our difficulty tracker follows the new period live, including how far through its 2,016 blocks the network is and an estimate of the next change.
Why did difficulty go up?
Because the blocks came too quickly. Bitcoin's developer documentation explains that every 2,016 blocks the network compares how long those blocks actually took with the ideal of 1,209,600 seconds, two weeks, and resets the target so that the next period should come out close to ten minutes a block. The adjustment is capped: difficulty can rise by at most 300% or fall by at most 75% in one step (Bitcoin developer guide: block chain). The original white paper describes the same idea as a moving average aimed at a steady number of blocks per hour (Nakamoto, 2008).
Using the block timestamps, the 2,016 blocks before block 971,712 took about 13.2 days, an average of roughly 9.4 minutes per block instead of 10. Faster blocks mean more hashing power joined the network or came back online, for example new machines being plugged in or miners that had paused returning. The network does not know which; it only sees the speed, and raises the bar to match.
- Blocks arrive faster than every ten minutes.
- After 2,016 blocks, the network measures the time taken.
- The target is tightened so each block needs more hashing on average.
- Block times drift back towards ten minutes, until hashrate changes again.
What does a 5.92% rise do to a miner's revenue?
For any given machine, expected bitcoin earned is proportional to its hashrate divided by the difficulty. A 5.92% higher difficulty therefore cuts expected bitcoin per terahash by 1 − 1 ÷ 1.0592, about 5.6%, if the price and fees stay where they were. Assumptions for the worked example below: one machine at 200 TH/s using 17.5 joules per terahash (3.5 kW), electricity at $0.06 per kWh, a subsidy of 3.125 BTC plus 0.02 BTC of fees per block, and a bitcoin price held at $80,000. All of these are illustrations.
| Per day, 200 TH/s | Before (132.72T) | After (140.58T) |
|---|---|---|
| Expected reward | about 9,530 sats | about 9,000 sats |
| In dollars at $80,000 | $7.63 | $7.20 |
| Electricity (84 kWh at $0.06) | $5.04 | $5.04 |
| Margin before pool fee and other costs | $2.59 | $2.16 |
A 5.6% fall in revenue became a 17% fall in this machine's margin, because electricity did not get any cheaper. That is the general pattern: the higher a miner's power cost relative to revenue, the harder each upward adjustment bites. A miner paying twice as much for power in this example would already be running at a loss. Try your own numbers in our mining revenue estimator, and see how pools smooth the daily income in our mining pools explainer.
How does this compare with recent adjustments?
Most retargets are small. The table lists the last six, read from the same chain data. Over these twelve weeks difficulty rose about 10% in total, with one larger step in September and this one in October.
| Date (UTC) | Block | New difficulty | Change |
|---|---|---|---|
| 16 October 2026 | 971,712 | 140.58T | +5.92% |
| 3 October 2026 | 969,696 | 132.72T | −0.03% |
| 19 September 2026 | 967,680 | 132.76T | +4.16% |
| 5 September 2026 | 965,664 | 127.45T | +1.31% |
| 23 August 2026 | 963,648 | 125.81T | −1.31% |
| 8 August 2026 | 961,632 | 127.48T | +0.99% |
Two things stand out for miners. First, the steps compound: a machine that earned a given amount of bitcoin per day in early August now earns about 9% less for the same work, before any change in fees. Second, falls are rarer and smaller than rises in this run, which is what you would expect while new, more efficient machines keep arriving. When that stops, for example after a sharp drop in the price or a jump in power costs, the pattern can reverse.
What happens next?
The next adjustment is due at block 973,728, roughly two weeks after the last one. Early in a period the estimate of the next change jumps around, because a handful of fast or slow blocks moves the average a lot; it settles as the period fills. If some miners switch off because their margins are too thin, blocks slow down and the next adjustment can come out lower. If more machines arrive, it can rise again. The halving, due at block 1,050,000, will later cut the subsidy part of the reward in half, a much bigger step than any single difficulty change.
Is a difficulty rise a price signal?
No. Difficulty follows hashrate with a lag, and hashrate follows miners' investment decisions made months earlier. A rise tells you that more machines were running over the last two weeks; it does not tell you what the price will do. Treat any channel that presents it as a buy or sell trigger with caution. The CFTC reminds investors that there is no such thing as a guaranteed investment or trading strategy (CFTC: understand the risks of virtual currency trading).
Sources
- mempool.space, hashrate and difficulty history and block 971,712 (data read 17 October 2026).
- Bitcoin developer documentation, Block chain: proof of work and target recalculation.
- S. Nakamoto, Bitcoin: A Peer-to-Peer Electronic Cash System, 2008.
- CFTC, Understand the Risks of Virtual Currency Trading.
Risk warning. Educational content only, not financial or investment advice. Mining revenue depends on difficulty, fees, the bitcoin price and power costs, all of which change. The figures above are worked examples, not forecasts.