Gravitational Force Calculator

• •Use the Gravitational Force Calculator when you need accurate results quickly without the risk of manual computation errors or unit conversion mistakes.
• •Use it to verify calculations made by hand or in spreadsheets — an independent check can catch errors before they lead to costly decisions.
• •Use it to explore how changing input parameters affects the output — a quick way to develop intuition and identify the most influential variables.
• •Use it when collaborating with others to ensure everyone is working from the same numbers and applying the same assumptions.

The Gravitational Force Calculator is a free, browser-based calculation tool for engineers, students, and technical professionals. Calculate gravitational force between two masses using Newton's law of universal gravitation. Fundamental to celestial mechanics. It implements standard formulas and supports both metric (SI) and imperial unit systems with automatic unit conversion. All calculations are performed instantly in your browser with no data sent to a server. Use this calculator as a quick reference and sanity-check tool during design, analysis, and learning. Always verify results against primary engineering references and applicable standards for any safety-critical application.

The Gravitational Force Calculator computes attractive force between two masses using Newton's universal law of gravitation. Published in 1687, this law explains falling apples, lunar orbits, tides, and planetary motion — all with a single equation. Unlike electrical forces, gravity is always attractive and much weaker, yet dominates at cosmic scales where mass accumulates without cancellation.

• !Forgetting G is incredibly small, so gravity between everyday objects is imperceptibly small.
• !Using wrong units (must be kg, m).