so i have a few credit cards. i have a Best Buy store credit card and a Platinum card from my bank (BB&T). im not even going to try and calculate my best buy cards interest rates because it varies on purchase. but ive always been confused about my BB&T Platinum cards interest rates. when i signed up for it i was given the best card, the platinum. when i asked about the interest rate she said something like "prime+ 5%" or something, and that the prime could fluctuate. this was like 4 years ago. i figured the interest rate would be around 10-11% and that seemed pretty good to me at the time. when i opened they gave me a $1000 limit. so i never really paid any attention to the interest charges, i just paid my bill online and threw the paper statements in the shredder. sometimes i didnt even open them lol. i can keep track of the charges online as well. ive always carried some balance, but ive always paid on time and paid at least 100 every month. safe to say i used the card pretty regularly. well i wanted to get a balance increase, and didnt think it would be a problem since ive used the card so much and had it a good while. plus i have great credit. they asked me how much i want, i said 5k, they approved. wonder how much i could have gotten, lol. but i dont need a 20k card or anything. so tonight i decided to calculate the interest based on the charge and the balance. so my balance was $892.28, interest charge this month was $4.49 4.49/892.28x100 = ~0.50 0.50x12 months = ~6% APR? did i do that right? seems crazy low for a CC bill, i hear about all these crazy interest charges like 20+%. or is my card just that awesome? just paid off the BB card now, and im going to cancel it when it all clears. and i think im going to keep just this card since ive had it for so long.