EngineeringTools

This is very useful engineering toolbox with several options of unit converter and calculators:-Unit converter (It has 54 common unit converters which you can easily expand it and define your own custom unit converter with existing dimensions or even define your own custom dimension)
-Simple Calculator-Scientific Calculator-Bill and tip Calculator-PayPal Fee Calculator-Custom Calculator (You can define customer calculators by defining inputs and outputs formula)

Just give it a try! EngineeringTools is absolutely FREE! No Ads at all! Appreciate for your comments. If you like, you can also donate to support it.