How many ounces is 500 grams?

About 17.64 ounces, a little over one pound.

Should I round for cooking?

Rounding to one decimal place is normally close enough for kitchen scales.

A gram is about 0.035274 ounces. Converting is useful when following a metric recipe with imperial kitchen scales.

Grams

goz

1 g = 0.035274 oz

10 g converts to 0.35274 oz.