How many grams in an ounce?

One avoirdupois ounce is 28.3495 grams. Jewelers use the troy ounce, which is 31.1035 g — slightly heavier.

Why don't recipes match exactly?

US recipes often round ounces (e.g. '4 oz = 115 g' instead of 113.4 g). For baking, weigh in grams for the best accuracy.

Convert grams into avoirdupois ounces for US recipes, jewelry weights, postal rates and packaging weights.

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From

1 g = 0.035274 oz

ounces = grams × 0.035274

How many grams in an ounce?: One avoirdupois ounce is 28.3495 grams. Jewelers use the troy ounce, which is 31.1035 g — slightly heavier.
Why don't recipes match exactly?: US recipes often round ounces (e.g. '4 oz = 115 g' instead of 113.4 g). For baking, weigh in grams for the best accuracy.