Gravitational Force Calculator
Educational estimates for point masses or spherical bodies, outside the body. No rotation, atmosphere, relativity or flight planning.
G = 6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻²
Presets are rounded reference estimates; gas giant values use a nominal reference radius.
| Planet preset | Gravity (m/s²) |
|---|---|
| Mercury | 3.7 |
| Venus | 8.87 |
| Earth | 9.80665 |
| Moon | 1.62 |
| Mars | 3.71 |
| Jupiter | 24.79 |
| Saturn | 10.44 |
| Uranus | 8.69 |
| Neptune | 11.15 |
A QUICK WALKTHROUGH
How to use this tool
- Choose a calculation and units.
- Select a preset or enter positive masses, distance and gravity.
- Calculate and read the model limitations.
Equations and units
G = 6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻². F = Gm₁m₂/r² in N; W = mg in N; field = GM/r² in N/kg; escape speed = √(2GM/r) in m/s. Mass is in kg and r is in m after conversion.
Planet preset
Presets are rounded reference estimates; gas giant values use a nominal reference radius.
GOOD TO KNOW
Common questions
What does distance mean?
Use separation between mass centers, or distance from the central body’s center. Surface calculations use the body radius, not altitude.
Are these precise planetary predictions?
No. Presets are rounded and the simplified spherical model excludes local variation and rotation. This is an educational estimate.