And remember that "temperature" on the calculator means the highest temp your brew has reached during the fermentation process, not the temp you expect to carb at.
I use a $20 digital kitchen scale I found at Walmart. Weighs everything from priming sugar to grains & hops. I also use those small bathroom size plastic cups for weighing small amounts, like hops. Saw Sam Calgione use'em for experimental batches. And those plastic deli-style lunch meat containers for weighing out larger amounts, like priming sugars or sugar additions to a batch. Small SS bowls for weighing grains. I use these two priming calculators; http://www.tastybrew.com/calculators/priming.html http://www.northernbrewer.com/priming-sugar-calculator
The different priming calculators all have a bit different beer styles listed that others don't. So I skip around, depending on the style.