Mining Hash Rate
This chart shows an estimate of how many hashes per second bitcoin miners are performing on the network. Estimate = difficulty * 232 / time. The bitcoin network has a global block difficulty that adjusts every 2016 blocks (~2 weeks) based on a target time of 10 minutes per block. As difficulty increases, more hashpower must be added to have the same statistical chance of finding a block. The time between bitcoin blocks can vary dramatically if there is a large increase or decrease in hashpower within this 2 week period.
Unit:  Hashes per second
Source:  BitcoinVisuals node (bitcoind)Learn More