How is weight (force of gravity) calculated?

Weight = mass × gravitational acceleration.

Why is weight different on the Moon than Earth?

The Moon's gravitational acceleration is about 1/6th of Earth's.

What's the difference between mass and weight?

Mass measures matter (constant); weight measures gravitational force (varies by location).

Weight (Force of Gravity) Calculator

Weight is the force gravity exerts on an object's mass — different from mass itself, which stays constant everywhere.

Mass (kg)

Gravity (m/s²)

Instant Result

Weight (Force) -

What Is a Weight Force Calculator?

Weight is the force gravity exerts on an object's mass — different from mass itself, which stays constant everywhere. This calculator finds an object's weight (in newtons) on Earth or any other planet or moon, given its mass and the local gravitational acceleration.

How to Use This Weight Force Calculator

Enter the object's mass in kilograms.
Enter the local gravitational acceleration (leave as 9.81 for Earth, or use 1.62 for the Moon, 3.71 for Mars, etc.).
Click Calculate to get the weight force in newtons.

Formula

Weight = mass × gravity
W = m × g

Worked Example

A 70 kg astronaut on Earth (g = 9.81 m/s²) weighs 70 × 9.81 = 686.7 N. On the Moon (g = 1.62 m/s²), the same astronaut weighs only 70 × 1.62 = 113.4 N.