12 Ounces to Grams

12 oz ≈ 340.19 g

Calculation: g = 12 oz × 28.3495 ≈ 340.19 g

Ounce to Gram Converter

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How heavy is 12 oz?

12 oz (0.34 kg) is comparable to the weight of a smartphone or a small book.

12 oz on the gram scale

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12 oz = 340.2 g

How to Convert Ounce to Gram

1 ounce = 28.3495 grams exact

Gram = Ounce × 28.3495

Example: 12 oz × 28.3495 = 340.19 g

Reverse Conversion

To convert grams back to ounces:

  • Remember, 1 gram equals 0.035274 ounces.
  • To convert 340.19 g to oz, multiply 340.19 x 0.035274, resulting in 12 oz.

exact This conversion factor is exact by international definition.

12 oz is also equal to:

About these units

Ounce: The ounce (oz) is a unit of mass equal to one sixteenth of a pound in the avoirdupois system.

Gram: The gram (g) is a metric unit of mass equal to one thousandth of a kilogram. It is widely used for measuring small quantities, particularly in food labeling, chemistry, and laboratory work.Although no...

Frequently Asked Questions

How much is 12 ounces in grams?

12 ounces equals 340.19 grams. This is calculated by multiplying 12 by the conversion factor 28.3495.

What does 12 ounces look like in grams?

12 ounces (340.19 grams) is about half a pound — a cup of water or a can of beans.

How do you calculate 12 ounces to grams?

Multiply 12 by the conversion factor 28.3495. The calculation is 12 × 28.3495 = 340.19 grams. This factor is defined by international measurement standards.

Share This Calculation

12 ounces = 340.194 grams
12 ounces = 340.194 grams — conversion chart

Nearby Conversions

2 ounces56.7 grams 4 ounces113.4 grams 6 ounces170.1 grams 8 ounces226.8 grams 10 ounces283.5 grams 14 ounces396.9 grams 16 ounces453.6 grams 18 ounces510.3 grams 20 ounces567 grams 22 ounces623.7 grams 24 ounces680.4 grams 26 ounces737.1 grams 28 ounces793.8 grams 30 ounces850.5 grams 32 ounces907.2 grams

For general conversions between ounces and grams, see the ounces to grams converter.

Also convert Ounces to:

Conversion factors verified against NIST (National Institute of Standards and Technology), BIPM (International Bureau of Weights and Measures) 1 lb = 0.45359237 kg by international agreement (1959). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.