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The abbreviation for ‘hours’ is hrs. The one for "Minute" is 'min'. It is a unit of measure, which have standard abbreviations, and they do not change in plural nor have a final period. So, the correct abbreviation for minute(s) is "min". My question is: why this discrepancy and not 'hr' in line with 'min'?

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What you have shown are common abbreviations: whether they are standard abbreviations depends on what you mean by standard. Officially, in this context, standard refers to abbreviations that have been officially set out by a national or international body.

I suspect you are wrong in stating that hrs is 'standard' for hours, while min is standard for minute(s). It probably depends who wrote it. I would say that all of the following are commonly used abbreviations:

hour(s): h, hr, hrs
minute(s): m, min, mins

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Standard units of measure have standard abbreviations. The hour and minute are not standard units (the standard unit is the second, symbol s), and consequently their abbreviations are not entirely standardised.

Note that where hour is used as a unit, for example in kilowatt-hour, it does have a standard symbol, h. The symbol for kilowatt-hour is kWh.

Note too that there is a difference between symbol (which is standardised) and abbreviation (which is not).

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    FWIW, I work for a large educational publisher and our house style is to abbreviate "hours" as "h". We see "hr" or "hrs" all the time, and we will always change it to "h" – Richard Sullivan Sep 29 '13 at 3:28
  • While the minute and the hour are not standard SI units, they are accepted for use together with SI units. The standard symbol for minutes is min while for hours it is h. See here: bipm.org/en/publications/si-brochure/table6.html – Ariel Jun 13 at 15:40

protected by tchrist Feb 22 '15 at 16:09

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