Oz to mL Conversion Guide for Easy Kitchen Measurements
A recipe should not slow you down because one ingredient is listed in ounces and the measuring jug on your counter uses milliliters. The good news is that the main conversion is simple: 1 US fluid ounce equals 29.5735 milliliters.
1 oz = 29.57 mL, or about 30 mL for quick estimates.
For US fluid ounces:
1 US fluid ounce = 29.5735 mL
In a real kitchen, you would usually measure that as 237 mL, or use the familiar US equivalent of 1 cup.
This is the most common source of confusion.
A fluid ounce measures volume. It tells you how much space a liquid takes up.
An ounce can also measure weight. It tells you how heavy something is.
That means these two lines do not mean the same thing:
Measurement | What it measures | Common kitchen use |
1 fluid ounce | Volume | Water, milk, oil, juice, broth |
1 ounce | Weight | Flour, sugar, cheese, chocolate, butter |
Milliliters measure volume, so they pair with fluid ounces, not weight ounces.
If you see “fl oz” in a recipe, bottle, measuring cup, or beverage label, you can convert it directly to mL. If you see only “oz” next to a dry ingredient, check the context. It may mean weight, and you may need grams instead.
A simple way to remember the difference
Use this rule:
Liquids usually convert from fluid ounces to milliliters. Dry ingredients usually convert from ounces to grams.
There are exceptions. Honey, yogurt, peanut butter, sour cream, and similar ingredients can be measured by volume or weight depending on the recipe. For baking, weight is usually better. For casual cooking, volume often works fine.
To convert US fluid ounces to milliliters, multiply the number of ounces by 29.5735.
`mL = oz × 29.5735`
For example:
`12 oz × 29.5735 = 354.882`
So:
12 US fluid ounces = 354.88 mL
Rounded for kitchen use:
12 oz ≈ 355 mL
To convert milliliters back to US fluid ounces, divide by 29.5735.
`oz = mL ÷ 29.5735`
For example:
`500 mL ÷ 29.5735 = 16.91 oz`
So:
500 mL ≈ 16.91 US fluid ounces
That is why a 500 mL bottle is close to 17 fl oz.
Use this chart for common kitchen and beverage measurements.
US fluid ounces | Milliliters | Rounded kitchen amount |
1 oz | 29.57 mL | 30 mL |
2 oz | 59.15 mL | 59 mL |
3 oz | 88.72 mL | 89 mL |
4 oz | 118.29 mL | 118 mL |
5 oz | 147.87 mL | 148 mL |
6 oz | 177.44 mL | 177 mL |
7 oz | 207.01 mL | 207 mL |
8 oz | 236.59 mL | 237 mL |
9 oz | 266.16 mL | 266 mL |
10 oz | 295.74 mL | 296 mL |
11 oz | 325.31 mL | 325 mL |
12 oz | 354.88 mL | 355 mL |
13 oz | 384.46 mL | 384 mL |
14 oz | 414.03 mL | 414 mL |
15 oz | 443.60 mL | 444 mL |
16 oz | 473.18 mL | 473 mL |
20 oz | 591.47 mL | 591 mL |
24 oz | 709.76 mL | 710 mL |
32 oz | 946.35 mL | 946 mL |
64 oz | 1,892.71 mL | 1.89 L |
128 oz | 3,785.41 mL | 3.79 L |
A quick note on large amounts: 128 US fluid ounces equals 1 US gallon, which is about 3.785 liters.
These are the amounts people look up most often when cooking, baking, mixing drinks, or reading labels.
1 US fluid oz = 29.57 mL
For quick measuring, use 30 mL.
2 US fluid oz = 59.15 mL
This is close to 60 mL, which is common for espresso drinks, syrups, and small portions of liquid ingredients.
4 US fluid oz = 118.29 mL
Rounded, that is 118 mL. In US kitchen terms, 4 fl oz is also 1/2 cup.
6 US fluid oz = 177.44 mL
Rounded, that is 177 mL. This amount often appears in beverage servings.
8 US fluid oz = 236.59 mL
Rounded, that is 237 mL. In US measurements, 8 fl oz is 1 cup.
10 US fluid oz = 295.74 mL
Rounded, that is 296 mL. This is close to 300 mL for casual liquid measuring.
12 US fluid oz = 354.88 mL
Rounded, that is 355 mL. Many beverage cans in the United States are 12 fl oz.
16 US fluid oz = 473.18 mL
Rounded, that is 473 mL. This amount equals 2 US cups, or 1 US pint.
20 US fluid oz = 591.47 mL
Rounded, that is 591 mL.
24 US fluid oz = 709.76 mL
Rounded, that is 710 mL. In US kitchen measurements, this equals 3 cups.
32 US fluid oz = 946.35 mL
Rounded, that is 946 mL. This equals 4 cups, 2 pints, or 1 quart.
Most US recipes use US fluid ounces. Some recipes from the United Kingdom, older cookbooks, or international sources may use Imperial fluid ounces.
The difference is small but real:
Unit | Milliliters |
1 US fluid ounce | 29.5735 mL |
1 Imperial fluid ounce | 28.4131 mL |
For one or two ounces, the difference is minor. For larger amounts, it adds up.
For example:
Amount | US fluid ounces | Imperial fluid ounces |
8 fl oz | 236.59 mL | 227.30 mL |
16 fl oz | 473.18 mL | 454.61 mL |
32 fl oz | 946.35 mL | 909.22 mL |
If you are in the United States or using a US recipe, assume US fluid ounces unless the recipe says otherwise. If you are converting a UK recipe, check whether it uses Imperial measurements.
The cup size can also change by country. A US cup is 236.59 mL, while many metric recipes use a 250 mL cup. That difference matters more in baking than in soups, stews, sauces, or marinades.
You do not always need four decimal places. In fact, exact conversions can make simple cooking feel harder than it needs to be.
For everyday home cooking, 1 oz ≈ 30 mL is often close enough. For baking, stick with the more accurate number or use a scale when the recipe gives weight.
Situation | Best approach |
Quick drink measurement | Round 1 oz to 30 mL |
Soup or sauce | Round to the nearest 5 or 10 mL |
Baking liquids | Use exact conversion or measure carefully |
Scaling a recipe by 2 or more | Use exact conversion before rounding |
Converting a full recipe | Convert all measurements in one pass |
If a cake recipe calls for 6 oz of milk, measuring 177 mL is better than measuring 180 mL, though either may work. If a salad dressing calls for 2 oz of vinegar, 60 mL is a perfectly reasonable kitchen measurement.
Ounces and milliliters are only part of kitchen measurement. US recipes often use cups, tablespoons, and teaspoons. Metric recipes often use milliliters, liters, grams, and kilograms.
Here are the most useful US volume equivalents.
US measurement | Fluid ounces | Milliliters |
1 teaspoon | 0.1667 fl oz | 4.93 mL |
1 tablespoon | 0.5 fl oz | 14.79 mL |
2 tablespoons | 1 fl oz | 29.57 mL |
1/4 cup | 2 fl oz | 59.15 mL |
1/3 cup | 2.67 fl oz | 78.86 mL |
1/2 cup | 4 fl oz | 118.29 mL |
2/3 cup | 5.33 fl oz | 157.73 mL |
3/4 cup | 6 fl oz | 177.44 mL |
1 cup | 8 fl oz | 236.59 mL |
2 cups | 16 fl oz | 473.18 mL |
4 cups | 32 fl oz | 946.35 mL |
These shortcuts are helpful when a measuring cup is dirty or missing. For example, if you need 2 fl oz of lemon juice, you can measure 4 tablespoons instead.
Metric liquid measurements are based on milliliters and liters. They are simple because they scale by tens, hundreds, and thousands.
Metric unit | Equivalent |
1 mL | 0.001 L |
10 mL | 0.01 L |
100 mL | 0.1 L |
250 mL | 0.25 L |
500 mL | 0.5 L |
1,000 mL | 1 L |
Common metric kitchen amounts include:
Milliliters | Liters | Approximate US amount |
5 mL | 0.005 L | 1 teaspoon |
15 mL | 0.015 L | 1 tablespoon |
30 mL | 0.03 L | 1 fluid ounce |
60 mL | 0.06 L | 1/4 cup |
120 mL | 0.12 L | 1/2 cup |
240 mL | 0.24 L | 1 cup, approximate |
250 mL | 0.25 L | Metric cup |
500 mL | 0.5 L | About 2.1 US cups |
1 L | 1 L | About 4.23 US cups |
Many metric recipes use rounded amounts like 100 mL, 250 mL, and 500 mL. US recipes often use fractions like 1/3 cup or 3/4 cup. A measuring cup with both markings saves time and reduces mistakes.
Sometimes the recipe works the other way. You might have a metric recipe that says 300 mL of broth, but your measuring cup shows cups and fluid ounces.
Use these formulas:
`US fl oz = mL ÷ 29.5735`
`US cups = mL ÷ 236.588`
Here are common metric liquid amounts converted to US kitchen measurements.
Milliliters | US fluid ounces | US cups |
30 mL | 1.01 fl oz | 0.13 cup |
50 mL | 1.69 fl oz | 0.21 cup |
60 mL | 2.03 fl oz | 0.25 cup |
100 mL | 3.38 fl oz | 0.42 cup |
120 mL | 4.06 fl oz | 0.51 cup |
150 mL | 5.07 fl oz | 0.63 cup |
180 mL | 6.09 fl oz | 0.76 cup |
200 mL | 6.76 fl oz | 0.85 cup |
240 mL | 8.12 fl oz | 1.01 cups |
250 mL | 8.45 fl oz | 1.06 cups |
300 mL | 10.14 fl oz | 1.27 cups |
350 mL | 11.83 fl oz | 1.48 cups |
400 mL | 13.53 fl oz | 1.69 cups |
500 mL | 16.91 fl oz | 2.11 cups |
750 mL | 25.36 fl oz | 3.17 cups |
1,000 mL | 33.81 fl oz | 4.23 cups |
For many recipes, you can round 240 mL to 1 US cup. But if a metric recipe uses a 250 mL cup, do not assume it equals a US cup exactly.
A fluid ounce of water and an ounce of flour are completely different measurements.
This is why converting dry ingredients from ounces to milliliters can be unreliable. Milliliters measure volume, but dry ingredients settle differently depending on texture, grind, moisture, and how they are scooped.
For example, one cup of all-purpose flour does not weigh the same as one cup of sugar. One cup of chopped nuts does not weigh the same as one cup of cocoa powder.
When a recipe lists dry ingredients in ounces, it usually means weight. Convert those ounces to grams.
For kitchen use:
1 oz by weight ≈ 28.35 g
Common weight conversions:
Ounces by weight | Grams |
1 oz | 28.35 g |
2 oz | 56.70 g |
3 oz | 85.05 g |
4 oz | 113.40 g |
5 oz | 141.75 g |
6 oz | 170.10 g |
8 oz | 226.80 g |
10 oz | 283.50 g |
12 oz | 340.19 g |
16 oz | 453.59 g |
Why a kitchen scale helps
A scale removes guesswork, especially in baking. Scooping flour with a measuring cup can pack in more than the recipe expects. Spoon-and-level measuring is better, but weighing is still more consistent.
Use a scale for:
Flour
Cocoa powder
Powdered sugar
Brown sugar
Chocolate
Butter
Cheese
Nuts
Dried fruit
Use a measuring cup or jug for:
Water
Milk
Cream
Broth
Juice
Oil
Vinegar
Wine
Some thick liquids work either way. Honey, molasses, yogurt, and peanut butter can be measured by volume in many casual recipes, but weight gives better repeatable results.
Butter conversions for US and metric recipes
Butter often appears in sticks, tablespoons, cups, ounces, or grams. That makes it one of the most useful ingredients to understand.
In the United States, one standard stick of butter is:
8 tablespoons
1/2 cup
4 oz by weight
113 g, rounded from 113.4 g
Useful butter conversions:
Butter amount | Tablespoons | Cups | Ounces by weight | Grams |
1 tablespoon | 1 tbsp | 1/16 cup | 0.5 oz | 14 g |
2 tablespoons | 2 tbsp | 1/8 cup | 1 oz | 28 g |
4 tablespoons | 4 tbsp | 1/4 cup | 2 oz | 57 g |
8 tablespoons | 8 tbsp | 1/2 cup | 4 oz | 113 g |
16 tablespoons | 16 tbsp | 1 cup | 8 oz | 227 g |
Butter is one place where ounces usually mean weight, not fluid ounces. Melted butter can be measured by volume, but many baking recipes list butter by weight or by tablespoons.
If a recipe says 4 oz butter, that means about 113 g, not 118 mL.
International recipes often use Celsius, while many US ovens use Fahrenheit. Temperature conversion is just as useful as converting ounces to milliliters.
Use these formulas:
`°C = (°F - 32) × 5 ÷ 9`
`°F = (°C × 9 ÷ 5) + 32`
Common oven temperatures:
Fahrenheit | Celsius | Common use |
250°F | 120°C | Low oven, slow drying |
275°F | 135°C | Low roasting |
300°F | 150°C | Slow baking |
325°F | 165°C | Gentle baking |
350°F | 175°C | Standard baking |
375°F | 190°C | Cookies, roasting |
400°F | 205°C | Roasting vegetables |
425°F | 220°C | High-heat roasting |
450°F | 230°C | Pizza, crisping |
475°F | 245°C | Very hot oven |
Many oven dials round Celsius temperatures to the nearest 5 or 10 degrees. That is normal. If a recipe says 350°F, setting the oven to 175°C works well.
For baking, preheat fully before adding the pan. Oven temperature can swing during preheating, and starting too early may affect rise, browning, or texture.
Converting one ingredient is easy. Converting a whole recipe takes a little more care.
Read the full ingredient list first
Before changing numbers, scan the full recipe. Look for:
This helps you spot which ingredients need volume conversions and which need weight conversions.
Separate liquids from dry ingredients
Convert liquids like water, milk, cream, broth, wine, and oil from fluid ounces to milliliters.
Convert dry ingredients from ounces to grams if the recipe lists them by weight.
For cups of dry ingredients, use a trusted ingredient-specific conversion when precision matters. A cup of flour, a cup of sugar, and a cup of cocoa powder do not weigh the same.
Convert before scaling
If you are doubling a recipe, convert first or scale first, but be consistent.
For example, a recipe uses 6 fl oz of cream.
Exact conversion:
`6 × 29.5735 = 177.44 mL`
Double batch:
`177.44 × 2 = 354.88 mL`
Rounded result:
355 mL cream
That is cleaner than estimating 6 oz as 180 mL, doubling to 360 mL, then wondering whether the extra amount matters.
Round with the recipe type in mind
If you convert 1/3 cup to milliliters, you get about 78.86 mL. Most kitchens will measure that as 80 mL.
If you convert 1 cup, you get 236.59 mL. Many cooks use 240 mL. Some metric recipes use 250 mL.
These rounded numbers are fine for soups and sauces. They may be less ideal for delicate cakes or pastry dough.
Write the converted values directly on the recipe
This small habit saves time. If a printed recipe says 12 fl oz, write 355 mL next to it. If it says 8 oz flour by weight, write 227 g next to it.
The next time you cook, you will not need to convert again.
Real kitchen examples
A few examples show how these conversions work in practical situations.
Converting a smoothie recipe
A smoothie recipe calls for:
8 fl oz milk
4 fl oz yogurt
2 fl oz orange juice
Convert each liquid:
Ingredient | US fluid ounces | Milliliters |
Milk | 8 fl oz | 236.59 mL |
Yogurt | 4 fl oz | 118.29 mL |
Orange juice | 2 fl oz | 59.15 mL |
Rounded for a blender:
Milk, 237 mL
Yogurt, 118 mL
Orange juice, 60 mL
Smoothies are forgiving, so rounding works well.
Converting a soup recipe
A soup recipe calls for 32 fl oz of broth.
`32 × 29.5735 = 946.35 mL`
That equals about 946 mL, just under 1 liter.
In the kitchen, you can use:
946 mL for accuracy
950 mL for easy measuring
1 liter if the soup can handle a little extra liquid
Most soups can handle the extra 54 mL from rounding up to 1 liter, especially if you simmer to reduce.
Converting a cake recipe
A cake recipe calls for:
6 fl oz milk
2 fl oz oil
8 oz flour by weight
4 oz butter by weight
Convert liquids to mL:
Ingredient | Measurement | Converted amount |
Milk | 6 fl oz | 177.44 mL |
Oil | 2 fl oz | 59.15 mL |
Convert dry or solid weights to grams:
Ingredient | Measurement | Converted amount |
Flour | 8 oz | 226.80 g |
Butter | 4 oz | 113.40 g |
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