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How Many Ounces in 1/3 Cup?

Quick Scoop

When you’re whipping up a recipe and spot “1/3 cup,” it can be handy to know exactly how many ounces that is—especially if you’re switching between measuring systems or using a digital scale. Short answer:
👉 1/3 cup equals 2.67 fluid ounces (fl oz) for liquids in U.S. measurements. Yes, it’s that precise! But let’s dig deeper because the conversion can shift slightly depending on what you’re measuring —liquids, solids, or dry ingredients.

Liquid Conversion Chart

For U.S. cooking, here’s how cup-to-ounce conversions typically look:

CupsOunces (fl oz)
1 cup8 oz
3/4 cup6 oz
2/3 cup5.33 oz
1/2 cup4 oz
1/3 cup2.67 oz
1/4 cup2 oz
1/8 cup1 oz

For Dry Ingredients 🍞

If you’re measuring something like sugar, flour, or oats, volume-to-weight conversions vary by density. Here’s a rough guide for 1/3 cup of common dry ingredients :

IngredientApprox. Ounces (by weight)
All- purpose flour1.41 oz
Granulated sugar2.33 oz
Brown sugar (packed)2.67 oz
Butter2.67 oz

💡 Pro Tip: Always check whether your recipe uses fluid ounces (volume) or ounces by weight. Measuring liquids with a dry cup—or vice versa—can throw off your recipe.

Why It Matters in 2026 Home Cooking Trends

Precision in baking and meal prepping has become a trending focus lately, especially with rising interest in nutrition tracking and smart scales. Cooking influencers (and recipes shared on TikTok and Reddit food forums) often mix imperial and metric units—so knowing this conversion helps you translate any recipe on the fly.

Example Scenario

You’re making a creamy coffee drink and your frother recipe says, “Add 1/3 cup milk.”
If your kitchen scale or measuring jug uses ounces, pour out 2.67 ounces of milk. That’s the sweet spot for perfect texture without guessing.

TL;DR

  • 🧁 1/3 cup = 2.67 fl oz (U.S.)
  • For dry ingredients, conversion depends on density.
  • Always note if the recipe wants volume (fl oz) or weight (oz).
  • Hop on the trend: accurate measurements = better taste and consistency!

Bottom Note:
Information gathered from public forums or data available on the internet and portrayed here.