Science
Gravitational Force Calculator
Use the gravitational force calculator for classroom universal-gravitation problems with masses and distance in SI units.
Choose the missing quantity; the calculator hides that field and solves it from the others.
Solved value
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- Gravitational force
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- Mass 1
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- Mass 2
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- Center distance
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Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the gravitational force calculator solves
Use the gravitational force calculator for classroom universal-gravitation problems with masses and distance in SI units.
Formula
How to use it
- Choose the quantity you want to solve for.
- Enter the known values with consistent units.
- Check the rearranged formula, substitution, and warnings before using the result.
How to read the answer
Gravitational force grows with each mass and falls with the square of the distance between their centers.
Common mistakes and edge cases
- Use center-to-center distance, not surface gap.
- Use kilograms and meters when using G = 6.6743e-11.
- This two-body formula ignores other nearby masses and relativistic effects.
Worked examples
Earth and moon estimate
Solved value
Gravitational force = 198,049,223,909,905,660,000 N
Find distance
Solved value
Center distance = 540,965,976.474676 m
Frequently asked questions
Can the gravitational force calculator solve for a missing variable?+
Yes. Use the solve-for control to hide the missing value, then enter the other known values with compatible units.
Why do the units matter?+
Formula calculators assume the entered values are already in matching units. Convert first when your measurements use mixed systems.
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Last updated: May 15, 2026