Megahashes Per Second

Megahashes per second, written MH/s, is a unit for the speed at which mining hardware performs hash calculations: one MH/s equals one million attempts per second to find a valid block. It belongs to a scale of units that runs from kilohashes (thousands) through megahashes, gigahashes and terahashes to petahashes and exahashes, each a thousand times larger than the last. The figure describes a device's hashrate, and summed across all miners it gives the network's total hash power. Which unit is used depends on the algorithm: early bitcoin CPUs and GPUs ran at MH/s on SHA-256, while modern bitcoin ASICs are rated in terahashes, and Ethereum GPU miners using Ethash were rated in MH/s until Ethereum ended mining in 2022. Hashrates from different algorithms cannot be compared directly.