It is very easy to measure anything if you know the proper conversions. Basically 1 ounce is equal to 28.35 grams. And if you know that you can easily convert into grams. In this case 13 ounces will be equal to 368.55 grams.
You can also use this calculator to convert the weight. To convert check out this link click here
You can also use this calculator to convert the weight. To convert check out this link click here
