An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. There are 60 minutes in an hour, and 24 hours in a day.

Is hour abbreviated as hr or h?

An hour (abbreviation: h or hr) is a unit of measurement used to measure time. An hour is equal to 60 minutes.

How do you abbreviate hour?

Normally these rules apply to abbreviated words just as they do to whole words. So if you were running other heads, subheads, or table column heads in title case, you would use "Amount per Hour" (per being a three-letter preposition) spelled out or "Amt/Hr" abbreviated.