How Do I Convert 2/3 Cup to mL?

Quick explanation

Use this page when a recipe calls for 2/3 cup and you want the mL value without working it out mid-prep. The direct answer is about 166.8 mL in Metric mode or 157.8 mL in US mode. This amount comes up in batters, milk, stock, and sugar, where repeated fraction conversions can drift if the wrong standard is used across a recipe consistently. For broader checks, use How Many mL Are in a Cup? or reverse the math with mL to Cups Converter.

Amount

2/3 cup ~ 0.667

cup to mL

Unit preset (cups) Metric (250 mL, default) US (236.6 mL)

Converted value

166.75 mL

~ 167 mL

Scale preview

Quick kitchen estimate. For precise nutrition or production work, verify standards and source measurements.

Calculation steps

How to convert 2/3 cup to mL exactly

mL = cups × cup-size-in-mL

For this page, cups = 0.667. Use 250 mL for Metric cup and 236.588 mL for US cup.

Practical kitchen rounding

2/3 cup ~ 167 mL (Metric) or 158 mL (US)

Nearest 1 mL is usually sufficient for daily cooking; stay on one cup standard through the recipe.

Worked example (this page)

Input: 0.667

Metric: 0.667 x 250 = 166.75 mL; US: 0.667 x 236.588 = 157.90 mL.

Practical: use 167 mL (Metric) or 158 mL (US).

About these units

Why cup values differ

Cup values vary by region, so 2/3 cup is not one universal mL result. At this size the gap is large enough to matter more clearly in sauces, custards, and other recipes with multiple measured liquids.

Metric cup = 250 mL (common in metric-standard recipe sources).
US cup = 236.588 mL (common in US recipe sources).
At 2/3 cup, the gap is about 9 mL between standards.

Millilitre (mL)

mL is a metric unit useful for precise measuring jugs and consistent scaling. For a fraction like 2/3 cup, measuring by mL is often cleaner than relying on eyeballing a cup mark.

1000 mL = 1 liter.
mL outputs reduce ambiguity when sharing recipes across regions.
About 158 to 167 mL is easier to repeat than a less-common cup fraction.

Tips

If a recipe uses “cup” but also lists mL, match that standard for best results.

If you’re comparing two recipes, standardize units first so you’re not mixing cup standards.

If your result is 0.8 cup, you’ll usually measure it as “just above 3/4 cup” unless you have markings.

Quick Reference

cup	mL
0.25	62.5
0.33	83.25
0.5	125
0.67	166.75
0.75	187.5
1	250

FAQ

How many mL is 2/3 cup?

2/3 cup is about 166.8 mL in Metric mode and 157.8 mL in US mode.

Why do I get two answers for 2/3 cup?

Because cup size differs by standard: Metric cup is 250 mL, while US cup is 236.588 mL.

What is the easiest way to measure 2/3 cup in mL?

Set your jug to Metric mode and measure about 167 mL. In US mode, measure about 158 mL.