Current scientific calculators only do half the job, they calculate the numbers whilst leaving out the units. This calculator does both and it does it in a very easy to use intuitive way. The calculation for the force on a 10kg mass at the Earth’s surface is simply calculated by using the usual keystrokes with a few extra to specify the units.

Clicking on G for the Gravitational constant in the bottom middle panel followed by the usual multiplication key.
Inputting the mass of the Earth numerically and then the units (kg from the units panel on the right) followed by the usual multiplication key again.
Selecting the digits one and zero from the number pad and then the units (kg) from the units panel.
Selecting the division operator from the Operators panel on the right.
Selecting an open bracket from the Operators panel.
Imputing the radius of the Earth followed by the unit (m for meters) and a closing bracket.
Clicking on the up arrow to raise the denominator to a power and then clicking on the number 2 followed by a closing bracket.
Finally the equal sign is clicked on and the answer is calculated and displayed with the correct units.

There is more documentation on our website at www.virtual-science.co.uk. Go to the product page for UCalc.