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How Much Is 12 Ounces of Water in Milliliters?

Q: How many milliliters is 12 ounces of water?

12 ounces of water converts to approximately 340.19 ml.

Q: What is the formula for converting ounces of water to milliliters?

Convert ounces to grams first (1 ounce = 28.3495g), then divide by 236.59 (grams per cup for water) to get cups, then multiply by 236.588 to convert cups to milliliters.

12 ounces of water equals 340.19 ml. Water has a density of 236.59g per cup. A lighter ingredient like flour (125g/cup) would fill more volume at the same weight, which is why ingredient-specific conversions matter.

12 ounces of water

340.19ml

Try: 1 ounce = 28.35 ml 2 ounces = 56.70 ml 3 ounces = 85.05 ml 4 ounces = 113.40 ml

Compare: 12 ounces buttermilk = 328.51 ml 12 ounces coconut milk = 356.13 ml 12 ounces coconut oil = 369.20 ml

Convert a different ingredient

12 ounces of water is also

1.44 cup (cups) 23.01 tbsp (tablespoons) 11.50 fl oz (fluid ounces)

Ounces of Water

Milliliters

340.19

Formula and Step-by-Step

(ounces × 28.35g/oz) ÷ 236.59g/cup × 236.588 = milliliters

Start with 12 ounces of water
Convert ounces to grams: 12 × 28.35 = 340.19g
1 cup of water = 236.59g
340.19g ÷ 236.59g/cup = 1.44 cups × 236.588 = 340.19 milliliters

The same formula works for any amount. Multiply (or divide) by the density, then convert units as needed.

Measuring Tip

For liquids, place your measuring cup on a flat surface and read at eye level. The bottom of the meniscus (the curve at the surface) should align with the measurement line.

Water at Different Amounts

How water scales across common ounces measurements. Your amount (12 ounces) is highlighted.

Other Amounts of Water

Ounces	Milliliters
1 ounce	28.35 ml
2 ounces	56.70 ml
3 ounces	85.05 ml
4 ounces	113.40 ml
5 ounces	141.75 ml
6 ounces	170.10 ml
8 ounces	226.79 ml
10 ounces	283.49 ml
12 ounces	340.19 ml
16 ounces	453.59 ml

Understanding the Units

What is an Ounce?

Weight ounces and fluid ounces are different measurements. A fluid ounce measures volume (29.574 ml), while an ounce measures weight (28.35g). They only align for water, where 1 fl oz weighs approximately 1 oz.

What is a Milliliter?

A milliliter (ml) is a metric unit of volume equal to 1/1000 of a liter. It is the standard volume measurement for cooking in most countries outside the US. One cup equals approximately 236.588 milliliters.

Frequently Asked Questions

How many milliliters is 12 ounces of water? expand_more

About 340.19 ml, based on water having a density of 236.59g per cup. The exact amount depends on how the ingredient is measured and the specific product.

What is the formula for converting ounces of water to milliliters? expand_more

First convert ounces to grams (1 ounce = 28.3495g), then divide by 236.59 (grams per cup), then multiply by 236.588 to get milliliters. For 12 ounces: 12 × 28.3495 = 340.19g, then 340.19 ÷ 236.59 = 1.44 cups × 236.588 = 340.19 ml.

How do I measure water accurately? expand_more

For the most accurate results, weigh water on a kitchen scale. If measuring by volume, use a liquid measuring cup on a flat surface and read the level at eye height.

Can I use the same conversion for water at different temperatures? expand_more

Temperature has a minimal effect on most cooking liquids. The density of water changes slightly with temperature, but the difference is usually less than 1-2% between refrigerator and room temperature. This conversion assumes room temperature.

How do I convert milliliters of water back to ounces? expand_more

Reverse the conversion: 340.19 ml ÷ 236.588 = 1.43791 cups, then 1.43791 × 236.59g/cup = 340.19g, then 340.19g ÷ 28.3495 = 12 ounces. Or use the Milliliters to Ounces converter.