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Abbreviations for most units of measurements use small letters and periods. The few exceptions that use capital letters are noted below. Temperature abbreviations use capitals because they come from proper nouns. Measures of mass or weight of types of tons are usually capitalized when abbreviated.
Abbreviations for metric units, including temperatures (Kelvin or Celsius), do not end with periods. Non-metric units with "per" (such as "miles per hour") usually do not take periods, either.
Temperature abbreviations are used in all types of writing. Other abbreviations of measurements are limited to lists, charts, technical writing, and informal writing. In standard formal English, they are spelled out.
If you spell out the number, spell out the unit of measurement.
There is no need to add an s to an abbreviation to show a plural. This is sometimes done in advertising ( "3 lbs. For a dollar"), but it is not necessary.
gal or gals = gallons g = gram
Abbreviations for most units of measurements use small letters and periods. The few exceptions that use capital letters are noted below. Temperature abbreviations use capitals because they come from proper nouns. Measures of mass or weight of types of tons are usually capitalized when abbreviated.
Abbreviations for metric units, including temperatures (Kelvin or Celsius), do not end with periods. Non-metric units with "per" (such as "miles per hour") usually do not take periods, either.
Temperature abbreviations are used in all types of writing. Other abbreviations of measurements are limited to lists, charts, technical writing, and informal writing. In standard formal English, they are spelled out.
If you spell out the number, spell out the unit of measurement.
There is no need to add an s to an abbreviation to show a plural. This is sometimes done in advertising ( "3 lbs. For a dollar"), but it is not necessary.
gal or gals = gallons g = gram
O, pt or pts = pints kg = kilogram (1,000g)
oz or ozs = ounces mg = milligram (1/1,000g)
fl.oz = fluid ounces mcg or µg = microgram (1/1,000,000g)
lb or lbs = pounds L or l = litre (or liter in US)
st = stones cl = centilitre (1/100 L)
gtts = drops ml = millilitre (1/1000 L)
iu = international units µl = microlitre (1/1,000,000 L)
m or min = minims meq or mEq = Milliequivalent
hr = hour m = metre (or meter in US)
min = minutes mm = millimetre (1/1,000 m)
sec = seconds cc or cu.cm = cubic centimetres (1/1,000 L(
ft = foot or feet
dr = dram or drachm
gr = grains sc = scruple
t or tsp =
teaspoon T or tbsp = tablespoon
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