Effective APY Calculator. This calculates the effective APY for a bank account bonus.
ROS Calculator. This calculates the return on spend for a given credit card deal.
ROS Calculator – MS Edition. Like the basic ROS Calculator but adds fields for MS.
Costco Gold Profit Calculator. For gold bars bought at Costco resold to resellers such as Pure.
BP CB Calculator. Calculates CB given gross interchange rate.
Date Calculator. Add to or subtract from a date.
Investment Calculator by Calculator.net.