I started mining on a friend's computer and it shows 300 kH/s. But when I research other peoples' hash rates I usually see MH/s. Are these speeds the same as kilobytes and megabytes?

Also, when I say 300 kH/s does that mean 300,000 Hashes generated per second?

Sure:

  • 1 kH/s is 1,000 hashes per second (sometimes mistakenly written KH/s).
  • 1 MH/s is 1,000,000 hashes per second.
  • 1 GH/s is 1,000,000,000 hashes per second.
  • 1 TH/s is 1,000,000,000,000 hashes per second.
  • 1 PH/s is 1,000,000,000,000,000 hashes per second.

Mining capability is measured in the number of attempts to find a block a miner can perform. Each attempt consists of creating a unique block candidate, and creating a digest of the block candidate by means of the SHA-256d, a cryptographic hashing function. Or, in short, a hash. Since this is a continuous effort, we speak of hashes per second or [H/s].

Hash rate denominations

  • 1 kH/s is 1,000 (one thousand) hashes per second
  • 1 MH/s is 1,000,000 (one million) hashes per second.
  • 1 GH/s is 1,000,000,000 (one billion) hashes per second.
  • 1 TH/s is 1,000,000,000,000 (one trillion) hashes per second.
  • 1 PH/s is 1,000,000,000,000,000 (one quadrillion) hashes per second.
  • 1 EH/s is 1,000,000,000,000,000,000 (one quintillion) hashes per second.
  • 1 ZH/s is 1,000,000,000,000,000,000,000 (one sextillion) hashes per second.

Conversions

  • 1 MH/s = 1,000 kH/s
  • 1 GH/s = 1,000 MH/s = 1,000,000 kH/s
  • 1 TH/s = 1,000 GH/s = 1,000,000 MH/s = 1,000,000,000 kH/s
  • and so forth

SI unit prefixes

The denomination of hash rates follows the International System of Units (SI). Hereby, the prefixes kilo, mega, giga, tera, peta, exa, and zetta each translate to an increase by a factor of one thousand.

Please note, that the symbol for kilo is a lower-case "k". As "K" is the symbol for kelvin, the unit of thermodynamic temperature.

The following table from Wikipedia shows an overview of the prefixes, symbols, and factors they correspond to.

Metric prefixes

Inconsistency of kilobyte, megabyte, and gigabyte

The computer industry's use of kilobyte, megabyte, and gigabyte is inconsistent with the SI. The Joint Electron Device Engineering Council (JEDEC) has redefined the prefixes kilo, mega and giga in relation with bit and byte as powers of 1024 instead of 1000. Higher prefixes were not redefined by JEDEC.

In order to avoid this inconsistency, the International Electrotechnical Commission (IEC) has proposed the binary prefix which uses kibi [Ki], mebi [Mi], and gibi [Gi] for 1024¹, 1024², and 1024³ respectively.

The following table from Wikipedia gives an overview.

Binary prefixes

  • Great answer, should be marked as the correct. I was looking to find what Exahash was since some mining pools are operating beyond Peta hash. Thanks – Goose Mar 26 at 22:09
  • kH/s means thousands of hashes per second.

  • MH/s means millions of hashes per second.

  • GH/s means billions of hashes per second.

Therefore, 300 kH/s are 300,000 hashes per second or 0.3 MH/s.

Hello I would refer you to wikipedia Metric prefixes. Hashes are measured in standart SI metric prefixes such as

Kilo - 1 000 Hashes/s

Mega - 1 000 000 Hashes/s

Giga - 1 000 000 000 Hashes/s

E.G. 2 Kh/s means that 2 000 hashes can be solved per second.

If you would like to know more about Hash visit bitcoin.it

From bitcoin.it :

A hash algorithm turns an arbitrarily-large amount of data into a fixed-length hash. The same hash will always result from the same data, but modifying the data by even one bit will completely change the hash. Like all computer data, hashes are large numbers, and are usually written as hexadecimal. BitCoin uses the SHA-256 hash algorithm to generate verifiably "random" numbers in a way that requires a predictable amount of CPU effort. Generating a SHA-256 hash with a value less than the current target solves a block and wins you some coins.

Or you might check this:

Cryptographic hash

protected by Tim Post Dec 10 '13 at 5:30

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