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Gravitational force calculator
Estimate the Newtonian attraction between two point or spherical masses.
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Attraction force3.34e-5N
Calculator controls
How to calculate
Estimate the Newtonian attraction between two point or spherical masses.
Attraction force = 6.67430e-11*a*b/r^2 N
Worked example
First mass (kg): 1000; Second mass (kg): 2000; Centre distance (m): 2.
Attraction force: 3.34e-5 N.
Assumptions and limits
Distance is between mass centres. Uses Newtonian gravity with G = 6.67430 × 10⁻¹¹ m³/(kg·s²); excludes extended nonspherical distributions and relativistic regimes.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate the Newtonian attraction between two point or spherical masses.
When this tool is useful
Attraction force = 6.67430e-11*a*b/r^2 N
Understanding your inputs
| Input | What to enter |
|---|---|
| First mass (kg) | Enter a number of at least 1e-12 and no more than 1e+35. |
| Second mass (kg) | Enter a number of at least 1e-12 and no more than 1e+35. |
| Centre distance (m) | Enter a number of at least 1e-12 and no more than 100000000000000000000. |
Frequently asked questions
What assumptions does this calculation use?
Distance is between mass centres. Uses Newtonian gravity with G = 6.67430 × 10⁻¹¹ m³/(kg·s²); excludes extended nonspherical distributions and relativistic regimes.
How is the result calculated?
Attraction force = 6.67430e-11*a*b/r^2 N