0.80 grams to milligrams
800 mg
0.80 g = 800 mg.
milligrams
800mg
1 g = 800 mg
In short
How many milligrams is 0.80 grams?
0.80 g = 800 mg. 1 gram = 1,000.000000 milligrams, so the working is 0.80 × 1,000.000000 = 800.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 gram = 1,000.000000 milligrams 0.80 × 1,000.000000 = 800
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (mg) | Off by |
|---|---|---|
| Whole number | 800 | exact |
| 1 decimal | 800.0 | exact |
| 2 decimals | 800.00 | exact |
Round trip: take 800 mg back the other way and you land on 0.8000 g — a drift of 0.0000 g. That gap is the rounding, not the conversion.
Frequently asked questions
What is 0.80 grams in milligrams?
0.80 grams is 800 milligrams. 1 gram = 1,000.000000 milligrams, so the working is 0.80 × 1,000.000000 = 800.
How accurate is 800 mg?
Rounding to 800 mg and converting straight back gives 0.8000 g, a drift of 0.0000 g from the 0.80 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
Grams to Milligrams Converter
Convert g to mg — and why a trailing zero is banned on a prescription.
Open the grams to milligrams converter →