At Uranus’s cloud tops, you would weigh 90.4% of your weight on Earth. Multiply your Earth weight by 0.904: a 70 kg person would read 63.3 kg, and a 154 lb person 140 lb. That is 9.6% lighter than on Earth. Your mass does not change; only the pull on it does.
The surface gravity is 8.87 m/s² against 9.81 m/s² on Earth. It is measured at the 1-bar level, because there is no solid surface to measure from. Weight is mass times local gravity, W = m × g, so the scale reading is your Earth reading times 0.904.
Weight at Uranus’s cloud tops by Earth weight
Each row is a person’s Earth weight and what the same person reads at Uranus’s cloud tops. The pounds column converts the kilograms (1 kg = 2.20462 lb); the ratio 0.9042 is the same for any unit.
| On Earth | At Uranus’s cloud tops (kg) | At Uranus’s cloud tops (lb) |
|---|---|---|
| 40 kg (88.2 lb) | 36.2 kg | 79.7 lb |
| 50 kg (110 lb) | 45.2 kg | 99.7 lb |
| 60 kg (132 lb) | 54.3 kg | 120 lb |
| 70 kg (154 lb) | 63.3 kg | 140 lb |
| 80 kg (176 lb) | 72.3 kg | 159 lb |
| 90 kg (198 lb) | 81.4 kg | 179 lb |
| 100 kg (220 lb) | 90.4 kg | 199 lb |
Calculated as weight × 8.87 ÷ 9.81. A bathroom scale calibrated on Earth would show these values.
Why gravity is 8.87 m/s² at Uranus’s cloud tops
Surface gravity follows from the body’s mass M and its radius R: g = G M ÷ R². The simulation uses a radius of 25,560 km at the 1-bar level, which with g = 8.87 m/s² corresponds to a mass of 14.5 Earth masses.
Uranus is 14.5 times Earth’s mass and has the same pull at the 1-bar level as Venus, 8.87 m/s². Its radius, about 4 Earth radii, cancels the extra mass.
It is an ice giant, mostly water, ammonia and methane around a small rocky core, and it is tipped on its side with an axial tilt of about 98°. That tilt has no effect on the weight, but it gives each pole 42 years of sunlight followed by 42 years of dark.
A jump and a fall at Uranus’s cloud tops
Gravity sets more than weight. The take-off speed that lifts you 50 cm on Earth would raise you 55.3 cm at Uranus’s cloud tops, in a jump lasting 0.706 s against 0.639 s on Earth. A ball dropped from 2 m takes 0.672 s to land, compared with 0.639 s on Earth.
Escape speed, the speed at which you leave for good, is 21.3 km/s, against 11.2 km/s for Earth. It does not depend on your mass.
Compare with other worlds
For a 70 kg person, here is the pull and the scale reading on each body in the simulation. Select one to get its own page.
| Body | Gravity | A 70 kg person reads |
|---|---|---|
| Mercury | 3.7 m/s² | 26.4 kg |
| Venus | 8.87 m/s² | 63.3 kg |
| The Moon | 1.62 m/s² | 11.6 kg |
| Mars | 3.71 m/s² | 26.5 kg |
| Jupiter | 24.8 m/s² | 177 kg |
| Saturn | 10.4 m/s² | 74.5 kg |
| Uranus | 8.87 m/s² | 63.3 kg |
| Neptune | 11.2 m/s² | 79.6 kg |
| Pluto | 0.62 m/s² | 4.42 kg |
| The Sun | 274 m/s² | 1,960 kg |
| Neutron star | 1.3×10¹² m/s² | 9.2 trillion kg |
This page is one case from the full guide, Weight on other planets, which covers every case, the assumptions behind the model and what it leaves out.
Other cases
- Mercury 70 kg reads 26.4 kg
- Venus 70 kg reads 63.3 kg
- The Moon 70 kg reads 11.6 kg
- Mars 70 kg reads 26.5 kg
- Jupiter 70 kg reads 177 kg
- Saturn 70 kg reads 74.5 kg
- Neptune 70 kg reads 79.6 kg
- Pluto 70 kg reads 4.42 kg
- The Sun 70 kg reads 1,960 kg
- Neutron star 70 kg reads 9.2 trillion kg
Frequently asked questions
How much does a 70 kg person weigh at Uranus’s cloud tops?
63.3 kg (140 lb). The ratio to Earth is 0.904, from g = 8.87 m/s² against 9.81 m/s².
Does my mass change at Uranus’s cloud tops?
No. Mass is the amount of matter in you and stays the same everywhere. Weight is the force gravity puts on that mass, so it is the weight that changes, to 90.4% of its Earth value.
How do I work out my weight at Uranus’s cloud tops?
Multiply your Earth weight by 0.904. In kilograms or pounds the answer comes out in the same unit, because the ratio has no unit.
Could anyone stand at Uranus’s cloud tops?
No. There is no solid surface: the gravity figure is taken at the 1-bar level, so it describes the pull at the cloud tops, not a place to stand.
Part of the learning path Gravity and motion, from a thrown ball to a planet.
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