The above equation is Newton's Law of Gravitation formulated by British
physicist, mathematician and astronomer Sir Isaac Newton (1642-1727).

The following 2 examples will help familiarize yourself with the formulas and with this calculator.
After trying both methods, you will agree that using the calculator is much easier than using the formula.

1) What is the gravitational force between one object of 3
kilograms of mass and
another object of 7 kilograms of mass that are 12
meters apart?
Using the calculator:
Click the 'Meters & Kilograms' button, then enter the
numbers, click 'Calculate'
and the answer is
9.7329 x 10^{-12} newtons.

or you can use this method:

2) Calculate the force between one object of 9 grams of mass and
another of 6 grams that are 50 centimeters meters apart.
Using the calculator:
Click the 'Centimeters &
Grams' button, enter the numbers, click 'Calculate'
and the answer is
1.4416 x 10^{-9} dynes.