How Many Cups Is 23 Ounces? | A Surprising 2 7/8 Cups

23 fluid ounces equals exactly 2.875 cups, which is 2 and 7/8 cups in the U.S. customary system for liquid volume.

That half-ounce beyond the 2-cup mark is the difference between a recipe that works and one that doesn’t. Most kitchens have a 2-cup measuring cup, so you’ll need to combine a 2-cup pour with a smaller one to hit 23 fluid ounces. Here’s the exact math, the measuring technique that prevents mistakes, and why confusing fluid ounces with dry ounces ruins bakes.

The Exact Conversion: 23 Fluid Ounces to Cups

The rule is simple: one U.S. cup holds 8 fluid ounces. Divide your total ounces by 8 to get cups. For 23 ounces, that’s 23 ÷ 8 = 2.875 cups. As a fraction, that’s 23/8, which simplifies to 2 and 7/8 cups.

Here’s how that breaks down into practical pours for your kitchen:

How to Measure 23 Fluid Ounces Accurately

The most common mistake is misreading the meniscus — the curved surface of the liquid in the cup. Follow these steps and you’ll hit the mark every time.

1. Use the right size liquid measuring cup. A 4-cup (32 oz) Pyrex or Anchor Hocking cup lets you see the 23 oz mark without overflow. A 2-cup cup won’t hold all 23 ounces in one go.
2. Pour slowly. Fast pouring introduces bubbles that push the liquid above the true line. Pour until the liquid is just below the 23 oz mark.
3. Read at eye level. Set the cup on a flat counter, squat down so your eyes are level with the measurement line on the cup, and read at the bottom of the meniscus — the lowest dip in the liquid’s surface.
4. Adjust and confirm. Add or pour off drops until the bottom of the meniscus sits exactly on the 23 oz line.

Liquid vs. Dry Ounces: The Mistake That Messes Up Bakes

Fluid ounces measure volume — how much space a liquid takes up. Dry ounces measure weight — how heavy an ingredient is. They are not interchangeable.

One cup of all-purpose flour weighs about 4.5 ounces, not 8 ounces. If you pour flour into a liquid measuring cup and assume it matches the 8:1 ratio, you’ll add nearly twice the flour the recipe calls for. That’s why you always use dry measuring cups (the nested scoop set) for flour, sugar, and oats, and liquid measuring cups (the glass or plastic pitcher) for water, milk, oil, and broth.

Regional Note: U.S. vs. Imperial Cups

This conversion — 1 cup = 8 fluid ounces — applies only in the United States. The British Imperial system uses a different cup: 1 Imperial cup holds about 10 Imperial fluid ounces. Using an Imperial measuring cup for a U.S. recipe will leave your dish significantly short on liquid. If you’re cooking from a U.K. or Australian recipe, check whether it calls for metric volume (milliliters) rather than cup measures.

23 Ounces in Common Kitchen Tasks

This volume shows up more often than you’d think. A standard can of soup plus a can of water runs about 23 ounces total. A large single-serve coffee at a diner often lands right around there. If you’re scaling a soup or sauce recipe to serve 6–8 people, 23 ounces of broth or crushed tomatoes is a common intermediate step.

Quick Reference: Ounces to Cups for Common Kitchen Volumes

Finish With the Right Measure

23 fluid ounces equals 2 7/8 cups. Use a 4-cup glass liquid measuring cup, read at eye level at the bottom of the meniscus, and never confuse fluid ounces with dry weight ounces. Keep a printed conversion chart inside your cupboard door and you’ll never second-guess a scaling recipe again.