What fraction of Earth's gravity is the Moon's gravity?

The Moon’s surface gravity is about one-sixth of Earth’s gravity. More precisely, lunar gravity is approximately 1.625 metres per second squared, compared with about 9.81 metres per second squared at Earth’s surface.

This difference means that an object’s mass does not change on the Moon, but its weight does. A person who weighs 600 newtons on Earth would weigh roughly 100 newtons on the Moon. The weaker pull results from the Moon’s much smaller mass; its mass is only about 1/81 of Earth’s, and its radius is also much smaller.

The one-sixth figure is a convenient approximation, not an exact constant everywhere on the lunar surface. Gravity varies slightly because the Moon has uneven concentrations of mass called mascons, or mass concentrations. Apollo astronauts demonstrated the effect dramatically: their movements appeared springy and slow because they were working in reduced gravity while wearing bulky spacesuits.