What is Hash Rate?
A measure of the total computational power being used to mine Bitcoin and process transactions. Expressed in hashes per second. A higher hash rate means the network is more secure against attacks.
Why It Matters
Hash rate directly correlates with Bitcoin's security. A higher hash rate means more computational work is being done to mine blocks, which makes it proportionally more expensive and difficult for an attacker to rewrite blockchain history. When Bitcoin's hash rate is over 800 exahashes per second, an attacker would need to control over half the network's hash rate to perform a 51% attack. This requires hundreds of billions of dollars in equipment and electricity, making attacks practically impossible. When hash rate increases, it signals that miners find mining profitable, which reinforces Bitcoin's security. Monitoring hash rate trends helps you understand mining profitability and network security.
How It Works
Hash rate is measured in hashes per second, with common units being megahashes (MH/s), gigahashes (GH/s), terahashes (TH/s), petahashes (PH/s), and exahashes (EH/s). One exahash is one billion billion hashes per second. Bitcoin's network hash rate is the sum of all computational power from all miners worldwide. It's calculated by looking at how many blocks are being mined and estimating the average computational power required to achieve that rate. When difficulty increases, more computational power is needed to maintain the 10-minute block time, so the same hardware produces less hashing power relative to the difficulty target.