about to prime first batch

[jaycccb]

im about to prime my first batch of beer its two and half gallons, i have dextrose priming sugar could some one tell how much to use and how much water to boiling it in.

 

[Revvy]

The rule of thumb for priming most beers (not talking about carbing to style) to 2-2.5 volumes of co2, is 1 ounce (28 grams) of corn sugar/gallon of beer.
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[jaycccb]

So the only way to measure is by weight?