Gravitational Field Strength Calculator
🪐 Gravity & circular motion. Use the Gravitational field strength formula to find field strength g, planet mass, distance from centre: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Field strength g | N/kg |
| Planet mass | kg |
| Distance from centre | m |
Worked example
Find the field strength g when Planet mass = 5.97 × 10²⁴ kg, Distance from centre = 6.37 × 10⁶ m.
Using g = GM/r²: Field strength g = 9.8193 N/kg.
Frequently asked questions
What is the formula for Gravitational field strength?
g = GM/r².
What do the letters stand for, and what units are used?
Field strength g in N/kg, Planet mass in kg, Distance from centre in m.
How do you calculate field strength g?
Put the values into g = GM/r². For example, with Planet mass = 5.97 × 10²⁴ kg, Distance from centre = 6.37 × 10⁶ m, field strength g = 9.8193 N/kg.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (field strength g, planet mass, distance from centre) and fill in the others: it rearranges the formula for you.
