Mars has a surface gravity of 3.71 metres per second squared, about 38% of Earth’s. Your mass doesn’t change, but the force pulling you down does. A 70-kilogram person would therefore have a weight on Mars equivalent to about 26.5 kilograms under Earth gravity.
A jump follows from the same weak gravity. The weaker the pull dragging you back down, the higher a given take-off speed carries you. Sophie Allan of the National Space Centre puts it plainly: “the height reached and gravitational field strength are inversely proportional”. Under tidy assumptions — a sealed dome, no air resistance and the same leg drive — she calculates that “a high jumper on Mars could expect to reach 2.65 times the height they could on Earth”. Treat that as an idealised ceiling, not a promise.
A jumping robot designed for Martian caves gives a useful comparison. In simulations using its full motor torque and movement limits, its maximum jump rose from 1.52 metres on Earth to 3.63 metres on Mars. It’s a machine, not a person, but the scaling shows why low gravity is so tempting.
The missing piece is inertia
A suit reduces the advantage even when its felt weight remains low. The reason is that Mars weakens gravity but does not reduce mass or inertia. Your legs still have to accelerate the astronaut, pressure garment, backpack and supplies together.
Consider the later Apollo A7L-B system. NASA gives it an Earth weight of 212 pounds, or about 96 kilograms, including 77 pounds for the garment assembly and 135 pounds for the life-support system. Add that to a 70-kilogram astronaut and the combined mass is about 166 kilograms. On Mars the rig would press on the ground like roughly 63 kilograms under Earth gravity, but the astronaut still has to launch all 166 kilograms upward.
In a simple energy comparison, with the same usable take-off energy as an unsuited jump on Earth, that Apollo-class astronaut would rise only about 12% higher on Mars. The low gravity survives, but most of the spectacular 2.65-times bonus is consumed by the suit’s mass before stiffness is even counted.
The mass that matters
Modern exploration suits make the problem clearer. A 2026 NASA paper on Mars life-support systems says the most recent xEMU design weighs 391 pounds, or 177 kilograms, while estimating that a Mars suit cannot exceed 229 pounds, or 104 kilograms. The xEMU is a lunar design, not a Mars suit, but its mass shows why NASA is setting a much lower target for Mars.
Put a 104-kilogram Mars suit on the same astronaut and the combined mass reaches 174 kilograms. Its Martian weight would be equivalent to about 66 kilograms on Earth, almost the astronaut’s original unsuited weight. Under the same idealised energy calculation, the jump advantage falls to roughly 6% before pressure resistance, restricted movement or fatigue are included.
Stiffness, not just mass
Mass is only half the story. A pressurised suit behaves like a balloon shaped around a person: pressure stiffens the material and resists bending. Every time you flex a knee or ankle to load a jump, some effort goes into deforming the suit instead of accelerating the body. NASA notes that the current EMU forces astronauts to expend energy deforming it, while its pressure limits movement.
Apollo gives a visible clue. NASA says improved lunar suits are intended to let astronauts walk rather than use the “bunny-hop” developed by Apollo moonwalkers. The suit fights the astronaut twice: through the mass that must be accelerated and through the resistance of its pressurised joints.
Where an astronaut actually lands
Unencumbered, a 70-kilogram person has about 38% of their Earth weight and could jump roughly two and a half times as high under ideal assumptions. In an Apollo-class rig, the theoretical gain over an unsuited Earth jump shrinks to about 12%. In a 104-kilogram Mars suit, it falls to about 6%, and joint stiffness could erase the remainder.
The picture is a spectrum, not a verdict. Mars makes gravity generous, but it does nothing to remove inertia. Anyone who walks there may feel lighter standing still, yet gain surprisingly little when trying to jump. The suit’s mass and mobility will decide whether the movement looks springy, awkward or almost Earth-like.
