There are approximately 29.57 milliliters (ml) in 1 US fluid ounce (oz).

Quick reference:

• 1 US fluid ounce = 29.57 ml
• 1 UK (Imperial) fluid ounce = 28.41 ml

If you need to convert ounces to milliliters, just multiply the number of ounces by 29.57 (for US fluid ounces).