What is the difference between UK and US fluid ounces?

A UK fluid ounce is 28.41ml, while a US fluid ounce is 29.57ml. This means the US fluid ounce is about 4% larger. For small quantities, the difference is negligible, but it becomes significant in larger volumes.

How many ml in a pint?

A UK pint is 568ml (20 UK fl oz), while a US pint is 473ml (16 US fl oz). This is a significant difference — a UK pint is about 20% larger than a US pint.

How many fluid ounces in a cup?

A US cup is 8 US fl oz (236ml). There is no standard UK cup, but the metric cup used in Australian cooking is 250ml (about 8.8 UK fl oz).

Why do UK and US fluid ounces differ?

Historically, the British Imperial system and the US Customary system diverged after American independence. The UK gallon is defined as 4.546 litres, while the US gallon is 3.785 litres. All smaller units (pints, fluid ounces) scale accordingly.

Are UK and US fluid ounces the same?

No. A UK fluid ounce is 28.41ml, while a US fluid ounce is 29.57ml — the US fluid ounce is slightly larger. For most cooking purposes the difference is negligible, but for precise baking it can matter when scaling recipes. This converter handles both systems.

BakeCalcs

Millilitres to Fluid Ounces Converter

Convert between millilitres and UK or US fluid ounces for cooking and baking.

Conversion Direction

Standard

Millilitres

How We Calculate This

The converter uses the standard conversion factors between millilitres and fluid ounces.

Conversion Factors

1 UK fl oz = 28.41 ml
1 US fl oz = 29.57 ml
1 litre = 35.2 UK fl oz = 33.8 US fl oz

Quick Reference

100ml = 3.5 UK fl oz = 3.4 US fl oz
250ml = 8.8 UK fl oz = 8.5 US fl oz
500ml = 17.6 UK fl oz = 16.9 US fl oz

Frequently Asked Questions

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Last updated: February 2026

All calculations are based on standard ratios and conversions. Results may vary with specific ingredients, equipment, and conditions.