There are 29.5735 milliliters (ml) in 1 US fluid ounce.

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 29.5735 for US fluid ounces.