The units
Hashrate is the number of SHA-256 attempts per second. The prefixes are the standard SI ones: kilo (10³), mega (10⁶), giga (10⁹), tera (10¹²), peta (10¹⁵), exa (10¹⁸) and zetta (10²¹). A 200 TH/s ASIC performs 2 × 10¹⁴ hashes per second; a network of 1,000 EH/s performs 10²¹, which is 1 ZH/s.
1 EH/s = 1,000 PH/s = 1,000,000 TH/s = 10¹⁸ H/s
share = your hashrate ÷ network hashrate
expected blocks per day = share × 144Share and expected blocks
Bitcoin targets a block every 10 minutes, 144 a day. If your hashrate is a fraction s of the network, you find on average 144 × s blocks per day. For a 200 TH/s machine against 1,000 EH/s that is 0.0000288 blocks a day — one block every 95 years on average. That is why individual miners join pools: the pool finds blocks regularly and pays each member in proportion to submitted work.
Where to get the network figure
Explorers and mining dashboards publish an estimated network hashrate derived from difficulty and recent block times; estimates over a few days are smoother than daily ones. The figure is an estimate in any case — nobody can measure total hashrate directly.
Frequently asked questions
+How many TH/s is 1 EH/s?
1,000,000 TH/s. Each unit step is a factor of 1,000: TH → PH → EH.
+What does H/s mean?
Hashes per second — how many SHA-256 double hashes a miner tries every second.
+How likely is solo mining a block?
Your expected blocks per day equal 144 × your share of the network. With a small share the wait is random and can be many years.
+Is hashrate the same across coins?
Only for coins with the same algorithm. Bitcoin uses SHA-256; Litecoin and Dogecoin use Scrypt, whose hashrates are not comparable.
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