This small tool helps you in managing your spendings in the Rift shop. It allows you to do a quick calculation of what kind of money an item really costs.
You can choose your currency and the preferred package size you'd normally use for buying credits.
There's an edit box to enter the amount of credits you'd spend. You'll have to hit enter to leave that field (API restriction). As soon as you hit enter, the addon will show you the price in real money at the bottom.
nkPanel Plugin
If nkPanel is installed the addon will act as an nkPanel plugin. You'll find it on the bar. By hovering over the title line a window will be shown were you can adjust the values and calculate the price of a shop item.
Window mode
If you're not using nkPanel a window will be shown on the screen.
Using the checkbox in the header you can lock / unlock the addon. If you move the addon above the screen it will snap to the top of the screen. If you move it so far to the bottom of the screen that the addon couldn't be shown fully it will snap to the bottom and place the title header to the bottom of the addon window.
The small triangle in the header title indicates the display mode. You can switch the display mode by clicking on the triangle with your mouse.
Using the X you can hide the addon. You can re-show it by using the command line /nkShopCalc or /nkCalc (If it was shown before this will hide it as it's basically of toggle display command). Also you can access the hidden addon through the nk Button located near the left of the default minimap position.