Nora the "no sugar needed pectin" box says you can add 3 cups of sugar so I used 3 cups of splenda per box. It turned out just as sweet as store bought regular full-sugar jam. My kids are so happy that they can finally have peanut butter and jelly with "real jelly" (they used to use that sugar free garbage) and of course 100% whole wheat lowest carb I can find bread.
The pectin has a few carbs...so does the pourable splenda and the fruit...but MUCH less then the garbage you can buy and it tastes SO much better. As long as you just have it every now and then it isn't bad. My family and I are low carbers for life so this is a GREAT find for us.
I'm still on the lookout for some way to make carb free cookies