Live Bitcoin network hash rate and mining difficulty.
Real-time hash rate in exahashes per second (EH/s), current mining difficulty, next difficulty adjustment estimate, and historical trends from 30 days to all time. Data from mempool.space and blockchain.info, refreshed every 5 minutes.
Next difficulty adjustment
Network hash rate
What is Bitcoin hash rate
Hash rate measures the total computational power dedicated to mining Bitcoin at any given moment. Miners run specialized hardware (ASICs) that perform trillions of SHA-256 hash computations per second, searching for a specific output that satisfies the network’s current difficulty target. Each successful find produces a new block, which the miner receives the current block reward for (currently 3.125 BTC plus transaction fees).
Hash rate is expressed in exahashes per second (EH/s). One exahash equals one quintillion hashes, or 10 to the 18th power. At the current total around 900 to 1000 EH/s, the global network is performing roughly 10 to the 21st power hash computations every second. The scale is genuinely difficult to intuit, which is part of why Bitcoin security guarantees are hard to challenge.
Hash rate is not directly measurable. No central authority counts all the ASICs on the network. Instead, it is estimated from the observed rate of block production. If blocks are arriving faster than the 10 minute target, the network must be hashing faster. If slower, hash rate is falling. The exact estimate requires several weeks of observation to be reliable because block timing is random from one block to the next. Published hash rate figures are backward-looking averages.
What does mining difficulty mean
Mining difficulty is the number that determines how hard it is to find a valid block. Specifically, a block is valid if its hash (SHA-256 of its contents) is numerically less than a target value derived from the current difficulty. Higher difficulty means a smaller target, which means miners must produce more hashes on average before finding a valid one.
Difficulty adjusts every 2,016 blocks (approximately every two weeks) to keep the average block time close to 10 minutes. If the last 2,016 blocks arrived faster than 2,016 times 10 minutes (two weeks), it means hash rate grew during that period, and difficulty increases to compensate. If blocks arrived slower, difficulty decreases. The maximum adjustment in either direction is capped at a factor of 4, so no single adjustment can change difficulty by more than plus 300 percent or minus 75 percent.
The mechanism is self-balancing and automatic. No human intervention is required. Miners cannot choose to mine at a different difficulty, and no authority can override it. The 10 minute target has held remarkably well over Bitcoin’s entire history despite hash rate growth of more than a million times since 2009.
How hash rate affects Bitcoin security
The most common security metric for a proof of work blockchain is the cost of a 51 percent attack: how much capital and operational effort would be required to control more than half of total hash rate and potentially rewrite recent transaction history. At the current Bitcoin hash rate, this cost is astronomical.
A rough estimate: if you needed 500 EH/s of additional hash rate (to exceed half of current total), you would need to deploy approximately 2.5 million units of top-tier ASIC hardware at 200 TH/s each. At roughly $4,000 per unit, that is $10 billion in hardware alone, plus the manufacturing capacity to produce them (which does not exist in that quantity), plus the electricity infrastructure to power approximately 9 gigawatts of load. This is comparable to the electricity consumption of a medium-sized country.
Even if someone did assemble that capacity, the attack itself would be financially destructive. A successful 51 percent attack would destroy market confidence in Bitcoin and crash the value of the BTC the attacker holds, along with the value of their own mining hardware. The rational calculation is that it is more profitable to use the same hardware to mine honestly than to attack. This economic alignment, not physics, is what actually keeps Bitcoin secure.
As hash rate grows over time, the attack cost grows with it. Bitcoin becomes more expensive to attack year over year, and the ratio of attack cost to potential attack reward gets less attractive. This is a desirable long-term property.
Hash rate versus Bitcoin price correlation
Over multi-year horizons, hash rate and Bitcoin price trend in the same direction. Higher BTC price means higher miner revenue, which justifies more investment in hardware, which increases total hash rate. Lower BTC price means some miners become unprofitable and shut down, reducing hash rate.
Over short horizons, the relationship is noisy. Hash rate lags price by several months because it takes time to manufacture, ship, and deploy new mining equipment. A price rally in January typically shows up as accelerated hash rate growth in April or May. Conversely, a price drop in June typically produces visible hash rate declines in August or September.
Analysts sometimes interpret hash rate as a “smart money” signal, arguing that miners have better information about the long-term trajectory of Bitcoin than retail investors do. The evidence for this view is mixed. Miners do invest based on long-term expectations, but they are also subject to the same market and regulatory risks as everyone else. Hash rate is a useful context indicator but not a reliable short-term trading signal.
Major hash rate events in history
A selection of inflection points in the Bitcoin hash rate record.
| Period | Move | Context |
|---|---|---|
| July 2021 | Crash of 50 percent in 3 weeks | China enforced its comprehensive crypto mining ban. Roughly half of global hash rate went offline within a month as Chinese miners shut down. |
| October 2021 | Recovery to pre-ban levels | Displaced Chinese miners relocated to the US, Kazakhstan, Russia, and Canada. Hash rate fully recovered within four months. |
| June 2022 | Temporary 10 percent dip | The Luna and Celsius collapses pushed BTC to $17,600. Less efficient miners at higher electricity rates went offline. Difficulty adjustment reduced target by 4 percent. |
| May 2023 | Record quarterly growth | Hash rate grew 35 percent in Q2 as new generation ASICs (S21, M60) came online. Difficulty hit successive all-time highs. |
| April 2024 | Post-halving capitulation | Block subsidy dropped from 6.25 to 3.125 BTC. Older generation miners (S19, M30) went offline within weeks. Hash rate dipped 6 percent before recovering. |
| Late 2024 | 1 ZH/s milestone approached | Total network hash rate first approached 1 zettahash per second (1000 EH/s) on favorable mining economics. |
| 2025 to present | Consolidation at 900+ EH/s | Industry consolidation continued. Public miners increased market share. Fleet efficiency improved further with S21 XP and successor models. |
Future hash rate projections
Predicting hash rate over multi-year horizons is inherently uncertain, but several drivers inform reasonable ranges.
On the upside: continued improvements in ASIC efficiency (newer generations typically improve joules per terahash by 15 to 30 percent), geographic diversification into regions with cheap electricity (Ethiopia, Argentina, Texas), and institutional capital entering the mining industry through public company vehicles. If Bitcoin price continues to grow, hash rate will follow at roughly 1.5 to 2 times the percentage increase over multi-year windows, based on historical elasticity.
On the downside: halvings reduce miner revenue immediately and lead to consolidation as less efficient fleets exit. The 2028 halving will cut block subsidy to 1.5625 BTC per block. Unless BTC price roughly doubles between now and then, a meaningful share of current hash rate will likely go offline after that event. The 2032 halving will compound the pressure. Over the very long term, transaction fees need to grow to maintain the security budget as the subsidy approaches zero around 2140. This is an open question the ecosystem has not fully resolved.
A reasonable base case projection: hash rate reaches 1.2 to 1.5 ZH/s (1200 to 1500 EH/s) before the 2028 halving, dips briefly after, and recovers within 6 to 12 months to set new all-time highs during the post-halving cycle. The specific numbers are speculative but the pattern has held for every prior halving.
Related tools
Bitcoin Mining Calculator
Calculate mining profitability from hardware specs, electricity cost, and BTC price.
ToolHalving Countdown
Track the next Bitcoin halving and plan around the cycle.
ToolFear and Greed Index
Live crypto market sentiment with historical chart.
Frequently asked questions
What is a good Bitcoin hash rate?
Hash rate is a measure of the entire network, not of an individual miner. There is no “good” or “bad” level, though higher is generally better for security. The current network hash rate of roughly 900 to 1000 exahashes per second (EH/s) makes Bitcoin the most secure blockchain in existence by orders of magnitude. For context, the next largest proof of work network is not even in the same ballpark.
Does higher hash rate mean higher Bitcoin price?
Over long horizons, the two tend to trend together because higher Bitcoin prices justify more investment in mining hardware, which drives hash rate growth. Over short horizons, hash rate lags price by several months because it takes time to order, ship, and deploy new mining equipment. Hash rate is not a reliable short-term trading signal on its own.
How often does difficulty adjust?
Bitcoin difficulty recalibrates every 2,016 blocks, which works out to approximately every two weeks assuming the target 10 minute block time is hit. The tool above shows the estimated time to the next adjustment based on current block production speed. If miners produce blocks faster than target (usually because hash rate grew), difficulty increases. If slower, difficulty decreases.
What is the maximum possible difficulty change?
Each adjustment is capped at plus 300 percent or minus 75 percent (a factor of 4 in either direction). In practice, adjustments of this magnitude are rare. Typical adjustments are within plus or minus 5 percent. The largest historical downward adjustment was roughly minus 28 percent in July 2021 after the China mining ban.
Could someone attack Bitcoin with enough hash rate?
A 51 percent attack requires the attacker to control more hash rate than the rest of the network combined. At current hash rate levels, this would require hundreds of billions of dollars worth of mining hardware and the electricity to run it. No individual or government has attempted to acquire this capacity, and even if they did, the attack would destroy the value of their own hardware investment.
Does the hash rate include all mining regions globally?
Yes. The published hash rate figures are estimated from the observed rate of block production on the Bitcoin network itself, which includes every miner regardless of geography. Specific regional breakdowns (how much comes from the US versus Kazakhstan, for example) are estimated separately by researchers like the Cambridge Centre for Alternative Finance and are only approximate.
What happens to hash rate after a halving?
Historically, hash rate dips in the weeks following each halving as less efficient miners become unprofitable and shut down. Each of the four halvings to date has seen this pattern, though the magnitude has decreased over time as the industry has matured. See our halving countdown for the current cycle position.
How is hash rate measured in exahashes?
Hash rate is expressed as the number of SHA-256 computations performed per second across the entire Bitcoin network. One exahash per second (1 EH/s) means a quintillion (10 to the 18th power) SHA-256 computations per second. The current total of roughly 1000 EH/s means Bitcoin miners collectively perform about 10 to the 21st power computations every second, or the equivalent of one billion high-end gaming PCs running non-stop, though in practice the work is done by purpose-built ASICs with thousands of times higher efficiency.
Related reading
For ongoing coverage of Bitcoin mining economics, industry consolidation, and network security developments, see our Bitcoin news archive. For context on cycle timing and the macro drivers behind hash rate investment, browse our market analysis desk. For daily coverage of the stories that move miner economics, subscribe to our free newsletter.
