What would you weigh on GJ 581 c?

GJ 581 c’s surface gravity is 1.09× Earth’s, so you would weigh about 9% more than you weigh on Earth. That gravity comes from a measured mass. GJ 581 c’s gravity is stronger than 39% of the known worlds in gravityfinder (a low bar to miss: most confirmed exoplanets are giants far heavier than Earth).

For scale: among worlds with solid ground and a mass and size that agree, the gentlest gravity is Charon at 0.03×, and the most crushing is Kepler-123 b at 6.40×.

Surface gravity computed by gravityfinder from GJ 581 c’s mass and radius (gravity = mass ÷ radius², with Earth = 1). Measured mass.