Three ounces is equivalent to 0.375 cups. Here are some other common conversions between ounces and cups:

• 1 ounce = 0.125 cups
• 2 ounces = 0.25 cups
• 3 ounces = 0.375 cups
• 4 ounces = 0.5 cups
• 5 ounces = 0.625 cups
• 6 ounces = 0.75 cups
• 7 ounces = 0.875 cups
• 8 ounces = 1 cup

Therefore, 3 ounces is equal to 0.375 cups.