Pints to Millilitres (pt to mL)

Common questions

How many mL are in a pint?

568.26125 mL in an imperial pint, which is what a pint means in the UK and Ireland, and 473.176473 mL in a US pint. This page opens on the imperial one. The amounts asked for next most often, all imperial: a quarter pint is 142.0653125 mL, half a pint is 284.130625 mL, 1.5 pints is 852.391875 mL, 2 pints is 1,136.5225 mL, 3 pints is 1,704.78375 mL, 4 pints is 2,273.045 mL, 6 pints is 3,409.5675 mL and 8 pints is 4,546.09 mL, which is the imperial gallon exactly. Type any of them into the From box and the headline changes without pressing anything.

Is this the UK pint or the US pint, and can I switch?

It opens on Pint (imperial) into Millilitre (mL), whatever pair you last used on the main converter. Both menus carry Pint (US) at all times, so choosing it in the From box gives the 473.176473 mL pint: half of one is 236.5882365 mL, 2 US pints are 946.352946 mL and 8 are 3,785.411784 mL, the US gallon. Set the two against each other and 1 imperial pint is 1.2009499255 US pints, while 1 US pint is 0.832674184629 imperial pints, so the British pint is about 20 percent larger. The Swap units button between the boxes turns this page into a millilitres to pints converter without reloading it.

Why are the two pints different sizes, and are both figures exact?

Both are exact, because both come from a gallon that is defined rather than measured. The imperial gallon is exactly 4.54609 litres and a pint is an eighth of it, which gives 568.26125 mL with nothing left over. The US gallon is exactly 231 cubic inches and an inch is exactly 2.54 cm, which makes the US pint 473.176473 mL. The two systems also count their pints differently: an imperial pint is 20 imperial fluid ounces and a US pint is 16 US fluid ounces, and the imperial fluid ounce is the smaller ounce at 28.4130625 mL against 29.5735295625 mL for the US one. The only rounding on this page is in the printing, which stops at twelve significant digits.

How do I convert mL back to pints?

Divide by 568.26125, or press the Swap units button between the two boxes, which turns this page into a millilitres to pints converter. It then reads 100 mL as 0.175975398639 pints, 250 mL as 0.439938496598, 284 mL as 0.499770132136, 500 mL as 0.879876993196, 568 mL as 0.999540264271 and 1,000 mL as 1.75975398639. In US pints that same litre is 2.11337641887. A carton labelled 568 mL is 0.26125 mL short of a full imperial pint, which is rounding on the carton rather than on this page.

How many mL is a pint of beer, and a pint of milk?

In the UK and Ireland draught beer and cider are sold by the imperial pint, so a pint is 568.26125 mL and a half is 284.130625 mL. The third-pint measure is 189.420416666 mL as this page prints it, which is what you get by typing 0.333333333333 into the From box. A doorstep pint of milk is the same 568.26125 mL. A US pint glass holds 16 US fluid ounces, 473.176473 mL, which is why the same order looks smaller on that side of the Atlantic: pick Pint (US) in the From box to convert that one.

How many pints is a litre, and how many is 500 mL?

One litre is 1.75975398639 imperial pints or 2.11337641887 US pints, a little over a pint and three quarters either way you read the imperial figure. 500 mL is 0.879876993196 imperial pints, just under seven eighths of one, and 1.05668820943 US pints. To work in that direction, press Swap units, or choose Litre (L) in the From box: the list under the answer then carries Pint (US) as one of the common units, and Pint (imperial) joins it when the switch marked Show 5 more is ticked.

Can I type half a pint as a fraction?

Not as a fraction. The From box takes digits, one decimal point and an optional minus sign, so a typed 1/2 raises a message saying it is not a number instead of guessing at what you meant. Use the decimal: 0.5 pt is 284.130625 mL, 0.25 pt is 142.0653125 mL and 0.75 pt is 426.1959375 mL. Thousands separators are the one extra character the field accepts, so 1,000 reads as a thousand and comes back as 568,261.25 mL. For an awkward fraction, the fraction calculator gives you the decimal first.

Does the page keep this pair, and does anything leave my browser?

The pair belongs to this page: it opens on Pint (imperial) into Millilitre (mL) even when the main converter remembers kilometres into miles, and it leaves that remembered pair alone. Only the amount you typed and the uncommon-units switch carry between the two pages, and the Start over button above the heading clears them. Nothing is uploaded, because the conversion is one multiplication against a table of factors that ships with the page, so it needs no account and keeps working with the network off. The Copy result button under the stage copies the headline without the thousands separators, ready to paste into a spreadsheet.