The Electric Car Conversion Kits cost comparisson Calculator allows you to enter simple facts like the price of gas and how many gallons your car holds, and then it tells you if it's worth it for you to convert to electric!
Aquarium Pocket Knife helps design aquariums by calculating the important values. It will calculate system weight, system weight per area, and tank weight. It will also calculate turn time and flow rate for filtration systems.
Gas Mileage Tracker is a program designed to help you understand and track your gas mileage and gasoline usage. Track total miles and gas mileage. Record each fill-up and MPG for multiple cars and vehicles. City and Highway MPG is tracked.