How many cups is 8 fluid ounces?

8 fluid ounces equals exactly 1 US cup. This is the fixed definition: 1 cup = 8 fl oz = 16 tablespoons = 48 teaspoons.

Why does the dry ounce conversion differ by ingredient?

A dry ounce is a weight measurement, not a volume measurement. Each ingredient has a different density, so the same weight fills a different volume. All-purpose flour is about 4.4 oz per cup; granulated sugar is about 7.1 oz per cup.

Is a fluid ounce the same as a dry ounce?

No. A fluid ounce measures volume (how much space a liquid takes up). A dry ounce measures weight. For water they are nearly equivalent (1 fl oz of water ≈ 1.04 oz by weight), but for other ingredients they differ significantly.

What is the US cup size in milliliters?

1 US customary cup = 240 mL. Australian metric cups are 250 mL and Imperial cups are about 284 mL, so if your recipe specifies one of those, results will differ slightly.

How many tablespoons are in a cup?

1 US cup = 16 tablespoons = 48 teaspoons. So ¼ cup = 4 tablespoons and ½ cup = 8 tablespoons.

Ounces to Cups Converter

Enter fluid ounces or select a dry ingredient to get the equivalent US cup measurement for cooking and baking.

Mode:

Fixed: 1 cup = 8 fl oz

Ounces Input

Amount (fl oz)

fl oz

Quick pick

Result

Enter an amount to see the cup equivalent.

Fluid Ounces to Cups — Quick Reference

1 US cup = 8 fl oz (exact).

Fluid Ounces	Cups	Fraction	Tablespoons

Dry Ounces per Cup — Common Ingredients

Weight of 1 US cup for frequently used baking ingredients.

Ingredient	oz / cup	½ cup	¼ cup

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Summary

For liquids, the conversion is fixed: 1 US cup equals exactly 8 fluid ounces, so 4 fl oz is ½ cup and 16 fl oz is 2 cups. Dry ingredients are different — a cup of flour weighs about 4.4 oz while a cup of granulated sugar weighs about 7.1 oz. This tool handles both: flip between fluid and dry mode, pick your ingredient, and get accurate cup equivalents with common fractions and tablespoon breakdowns.

How it works

Choose Fluid Ounces or Dry Ounces mode using the toggle.
For dry mode, select the ingredient from the dropdown.
Enter the number of ounces in the input field.
The converter calculates cups using the fixed 8 fl oz/cup ratio (fluid) or ingredient density (dry).
Results show decimal cups, the nearest common fraction, and tablespoons.
Use quick-pick buttons to jump to common recipe amounts.

Use cases

Convert a recipe that lists milk or water in fluid ounces to cups.
Figure out how many cups are in a 12 fl oz can of broth.
Convert dry ounces of flour from a postal scale to cup measurements.
Scale a baking recipe up or down when measurements are in ounces.
Verify how many cups of sugar or butter a recipe needs by weight.
Cross-check a European recipe that mixes metric and US measurements.
Teach kitchen measurement conversions to beginner cooks.

Frequently Asked Questions

Last updated: 2026-07-14 · Reviewed by Nham Vu