Frequently Asked Questions
Everything you need to know about the Gravitational Force Calculator.
How does the gravitational force calculator work?
Enter two masses and the distance between them (or solve for one of those given the force), and it applies F = Gm1m2/r² to compute the result.
Is it free?
Completely free, no sign-up, downloads, or limits.
What is the gravitational constant G?
G = 6.674×10⁻¹¹ N·m²/kg², a fixed constant used in Newton's law of universal gravitation.
Can I use preset planet masses?
Yes, presets for Earth, the Moon, the Sun, and other planets auto-fill common values.
Does it handle very large or small numbers?
Yes, inputs and outputs support scientific notation for astronomical masses and distances.
Does it show the steps?
Yes, the formula and substitution — including the value of G — are shown for every calculation.
What if I enter a distance of zero?
This is flagged as invalid since it produces an undefined (infinite) force.
Can it solve for mass or distance instead of force?
Yes, choose which quantity to solve for and enter the other three.
Is my data stored?
No; everything runs in your browser and isn't stored or sent anywhere.
Does it work on mobile?
Yes, fully responsive on all screen sizes.