Hash Rate

Hash rate is the speed at which a network's miners can perform hashing operations: the trial-and-error calculations used to find a valid block header and add it to a Proof of Work blockchain. Rather than measuring a single miner's output, it usually refers to the combined power of every device competing to solve the next block, from ASIC rigs and mining farms to, on smaller networks, ordinary GPUs.

Hash rate and mining difficulty move in lockstep. Bitcoin's protocol recalculates difficulty every 2,016 blocks, roughly every two weeks, to keep average block times near 10 minutes: if the network's combined hash rate rises, difficulty climbs to compensate; if miners drop offline, difficulty falls. This feedback loop is why hash rate charts and difficulty charts track each other so closely over time.

Because rewriting blockchain history requires outpacing all honest miners combined, hash rate also functions as a rough security gauge: the higher it climbs, the more expensive a 51% attack becomes. Bitcoin's hash rate has spent 2026 fluctuating near record territory, in the hundreds of exahashes per second, making an attack on it financially unrealistic; smaller Proof of Work coins with a fraction of that computing power carry no such guarantee and have been attacked successfully in the past.

Hash rate is expressed in hashes per second, scaling from kilohash (KH/s) up through mega, giga, tera, and exahash (EH/s) as network power grows, and is typically tracked as a smoothed average rather than a live figure, since individual block discovery times are inherently random.