how much is 800 grams?

Why go to the trouble of asking here when for the same effort you could just Google it or even, with minimal effort, learn the metric system?

If, in the google search box, you type "800 grams in ounces", you will get the answer. This is valid for other metric-US weight conversions and for Centigrade to Fahrenheit as well.

800 grams is about 1 3/4 pounds or 28 ounces