1 Ounce to Ml – Answer with Formula

1 ounce is equal to approximately 29.5735 milliliters (ml).

When converting ounces to milliliters, you multiply the number of ounces by 29.5735, since 1 US fluid ounce equals about 29.5735 ml. This makes it easier to measure liquid volumes in metric units.

Conversion Tool

Conversion Formula

The formula to convert ounces (oz) to milliliters (ml) is:

milliliters = ounces × 29.5735

This work because one US fluid ounce is defined as exactly 29.5735 milliliters. So to find how many milliliters is in any number of ounces, you just multiply by 29.5735.

Example:

Convert 3 ounces to ml:

• Multiply 3 by 29.5735
• 3 × 29.5735 = 88.7205 ml
• So, 3 ounces equal 88.7205 milliliters

Conversion Example

• 5 ounces to ml:
  • Multiply 5 by 29.5735
  • 5 × 29.5735 = 147.8675 ml
  • Result: 5 oz = 147.8675 ml
• 0.75 ounces to ml:
  • Multiply 0.75 by 29.5735
  • 0.75 × 29.5735 = 22.180125 ml
  • Result: 0.75 oz = 22.1801 ml (rounded)
• 12 ounces to ml:
  • Multiply 12 by 29.5735
  • 12 × 29.5735 = 354.882 ml
  • Result: 12 oz = 354.882 ml
• 0.1 ounces to ml:
  • Multiply 0.1 by 29.5735
  • 0.1 × 29.5735 = 2.95735 ml
  • Result: 0.1 oz = 2.9574 ml (rounded)
• 7.5 ounces to ml:
  • Multiply 7.5 by 29.5735
  • 7.5 × 29.5735 = 221.80125 ml
  • Result: 7.5 oz = 221.8013 ml (rounded)

Conversion Chart

The table below shows ounce values from -24.0 to 26.0 and their equivalent in milliliters. You can use this chart to quickly reference conversions without calculating.

Related Conversion Questions

• How many milliliters are in 1 ounce exactly?
• What is the volume in ml for 1 fluid ounce in US measurements?
• Convert 1 oz to ml for cooking recipe accuracy?
• Is 1 ounce always equal to 29.5735 ml in all countries?
• How to convert 1 ounce to milliliters quickly without calculator?
• Does 1 ounce equals same ml in liquid and dry measurements?
• Why do some sources say 1 oz is 30 ml but not 29.5735 ml?

Conversion Definitions

Ounce: An ounce (oz) is a unit of volume used primarily in the United States to measure liquids. It is based on the US customary system where 1 fluid ounce equals 1/128th of a US gallon and exactly equals 29.5735 milliliters. It differs from the dry ounce which measures weight.

Milliliter (ml): A milliliter is a metric unit of volume equal to one-thousandth of a liter. It is used worldwide to measure liquid volumes in a precise way. One milliliter corresponds exactly to one cubic centimeter, which makes it a standard unit in science, cooking, and medicine.

Conversion FAQs

Can I use the ounce to ml conversion for any kind of ounce?

The conversion applies only to US fluid ounces, which measure volume. Ounces can also measure weight (avoirdupois ounces), which are different. Be sure your ounce is fluid volume before using the 29.5735 ml conversion.

Why does 1 ounce sometimes get rounded to 30 ml?

Many people round 29.5735 ml to 30 ml for simplicity, especially in cooking or casual use. This makes mental math easier but is less precise. For scientific or medical needs, use the exact 29.5735 ml value.

Does the conversion change if I measure cold or hot liquids?

The ounce to ml conversion is a fixed unit relationship and does not change with temperature. However volume can expand or contract with temperature, but the unit conversion itself stays constant.

Is the ounce to ml conversion same in UK and US measurements?

No, the UK uses the imperial fluid ounce which is about 28.413 ml, slightly less than the US fluid ounce. So when converting ounces to ml, check if it’s US or UK fluid ounces.

Can I convert dry ounces to milliliters using this method?

No, dry ounces measure weight and milliliters measure volume. You cannot directly convert without knowing the substance’s density. This formula is only for fluid ounces to ml conversions.