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How Much Is 12 Ounces of Mayonnaise in Cups?

12 ounces of mayonnaise equals 1.55 cups. That's 340.19g, and Mayonnaise has a density of 220g per cup. Because ounces measure weight and cups measure volume, the result depends on the ingredient's density.

12 ounces of mayonnaise
=
1.55cups
Result using all cup standards info
1.55 cups (US) 1.46 cups (Metric Cup) 1.29 cups (Imperial Cup)
1.55

Formula and Step-by-Step

(ounces × 28.35g/oz) ÷ 220g/cup = cups
  1. Start with 12 ounces of mayonnaise
  2. Convert ounces to grams: 12 × 28.35 = 340.19g
  3. 1 cup of mayonnaise = 220g
  4. 340.19g ÷ 220g/cup = 1.55 cups

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

Measuring Tip

For the most accurate results, weigh mayonnaise on a kitchen scale. Thick spreads can vary by 5-10% depending on how firmly they are packed.

Mayonnaise at Different Amounts

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

3 oz0.39 cups4 oz0.52 cups5 oz0.64 cups6 oz0.77 cups8 oz1.03 cups10 oz1.29 cups12 oz1.55 cups16 oz2.06 cups

Other Amounts of Mayonnaise

Ounces US Cups Metric Cup Imperial Cup
1 ounce 0.13 cups 0.12 cups 0.11 cups
2 ounces 0.26 cups 0.24 cups 0.21 cups
3 ounces 0.39 cups 0.37 cups 0.32 cups
4 ounces 0.52 cups 0.49 cups 0.43 cups
5 ounces 0.64 cups 0.61 cups 0.54 cups
6 ounces 0.77 cups 0.73 cups 0.64 cups
8 ounces 1.03 cups 0.98 cups 0.86 cups
10 ounces 1.29 cups 1.22 cups 1.07 cups
12 ounces 1.55 cups 1.46 cups 1.29 cups
16 ounces 2.06 cups 1.95 cups 1.72 cups

Understanding the Units

What is an Ounce?

Ounces are commonly used in US recipes for cheese, meat, chocolate, and other ingredients sold by weight. Many kitchen scales offer both gram and ounce readings.

What is a Cup?

A cup is a US customary unit of volume equal to 236.588 milliliters or 8 fluid ounces. It is the most common volume measurement in American recipes. One cup can be divided into 16 tablespoons or 48 teaspoons.

Frequently Asked Questions

About 1.55 cups, based on mayonnaise having a density of 220g per cup. The exact amount depends on how the ingredient is measured and the specific product.
First convert ounces to grams (1 ounce = 28.3495g), then divide by 220 (grams per cup). For 12 ounces: 12 × 28.3495 = 340.19g, then 340.19 ÷ 220 = 1.55 cups.
For the most accurate results, weigh mayonnaise on a kitchen scale. If measuring by volume, spoon the ingredient into the measuring cup and level it off with a straight edge rather than scooping directly.
Fat content has a small effect on density. Higher-fat versions are slightly lighter per volume because fat is less dense than water. The difference is usually under 5%, so this conversion works well for standard varieties.
Reverse the conversion: 1.55 cups × 220g/cup = 340.19g, then 340.19g ÷ 28.3495 = 12 ounces. Or use the Cups to Ounces converter.