Gravitational Force of an object

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Sir Isaac Newton developed the law of universal gravitation, which describes the gravitational force between two masses but did not determine the exact value of the gravitational constant 'G'. The measurement of 'G' is credited to Henry Cavendish through his famous experiment. This gravitational constant can indeed be applied to calculate the gravitational force of smaller objects, such as a bottle or a human body, although the forces would be significantly smaller. Understanding these concepts enhances knowledge of gravitational interactions in everyday life. Learning about these principles can be rewarding and insightful.
ElectroViruz
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Just a little curious. What formula did Sir Isaac Newton used to find out the exact value of Earth's gravitational force ? Can we apply that formula to find out the gravitational force of other objects ? Let's say, calculating the gravitational force that my bottle has or our body. I know that the value in such objects with small mass would be minute, but I thought it'd be cool to know :)
 
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