There's more to Windows Calculator than meets the eye... I bet you already know that Calculator can flip between Scientific, Programmer and Statistical mathematical functions by going to the View menu and changing it from Standard mode. Did you also know it can calculate the down payment on a 25-year mortgage? (Go View > Worksheets > Mortgage and fill in the form to the right) Or that it contains Unit Conversion, so for example when the civilized world reports temperatures of -25 degrees Celsius, you can convert that to degrees Fahrenheit or even Kelvin.
The Worksheets also include Vehicle Leasing and Fuel Economy calculators in imperial and metric. Lastly, if you need to find out how many days till Christmas 2014, go View > Date Calculation and it'll spit out the answer in months, weeks and days, or straight days.
In Windows 7 launch Calculator by Start > All Programs > Accessories > Calculator.
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