how much bottling sugar?

[Geosomin]

Last weekend, as stress relief while finishing up my thesis, I started up 5 gallons of IPA from a kit. Easy peasy. I plan on bottling in a week or so to give it about 3 weeks of fermentation.
Thing is, I just realized I forgot to keep the kit insert so I am unsure of how much corn sugar to add prior to bottling. I *think* it said 2/3 of a cup but I don't want a basement of exploding beer bottles.
I use the 500mL plastic bottles. I prefer boiling the sugar water and adding it to the racked beer prior to bottling. I am wondering if I don't know the appropriate amount of sugar to add, does 2/3 of a cup sound reasonable? It's been a while, so I'm not sure if this would be appropriate.
I feel quite silly over this and don't want to waste this beer. Any advice on how much bottling sugar to use?

 

[JJL]

Usually, if it is truly corn sugar, it will be 3/4 cup for a 5 gal batch on average. This is assuming you are fermenting at typical ale temps (above 60F). If it's table sugar, then 2/3 cup would be appropriate. If you are using DME, it's usually 1.25 cups. These are all just averages, which is usually what a kit will recommend for an ale. If you are measuring by weight, the average is typically 1oz of corn sugar per gallon you are bottling (so 5oz for a 5 gal batch).

 

[kingwood-kid]

http://hbd.org/cgi-bin/recipator/recipator/carbonation.html

 

[unionrdr]

Or try this calculator by weight & a cheap digital scale; http://www.tastybrew.com/calculators/priming.html