At Neptune’s cloud tops, you would weigh 114% of your weight on Earth. Multiply your Earth weight by 1.14: a 70 kg person would read 79.6 kg, and a 154 lb person 175 lb. That is 14% heavier than on Earth. Your mass does not change; only the pull on it does.
The surface gravity is 11.2 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 1.14.
Weight at Neptune’s cloud tops by Earth weight
Each row is a person’s Earth weight and what the same person reads at Neptune’s cloud tops. The pounds column converts the kilograms (1 kg = 2.20462 lb); the ratio 1.137 is the same for any unit.
| On Earth | At Neptune’s cloud tops (kg) | At Neptune’s cloud tops (lb) |
|---|---|---|
| 40 kg (88.2 lb) | 45.5 kg | 100 lb |
| 50 kg (110 lb) | 56.8 kg | 125 lb |
| 60 kg (132 lb) | 68.2 kg | 150 lb |
| 70 kg (154 lb) | 79.6 kg | 175 lb |
| 80 kg (176 lb) | 90.9 kg | 200 lb |
| 90 kg (198 lb) | 102 kg | 226 lb |
| 100 kg (220 lb) | 114 kg | 251 lb |
Calculated as weight × 11.2 ÷ 9.81. A bathroom scale calibrated on Earth would show these values.
Why gravity is 11.2 m/s² at Neptune’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 24,760 km at the 1-bar level, which with g = 11.2 m/s² corresponds to a mass of 17.2 Earth masses.
Neptune’s pull at the 1-bar level is 1.14 times Earth’s, the only planet other than Jupiter that pulls more than 10% harder than Earth. It has 17.2 Earth masses packed into a radius of 3.9 Earth radii, which makes it denser than Uranus.
Neptune also has the fastest winds measured on any planet, around 2,000 km/h. You would have no ground to brace against anyway. Read more in why Neptune’s winds are the fastest.
A jump and a fall at Neptune’s cloud tops
Gravity sets more than weight. The take-off speed that lifts you 50 cm on Earth would raise you 44 cm at Neptune’s cloud tops, in a jump lasting 0.562 s against 0.639 s on Earth. A ball dropped from 2 m takes 0.599 s to land, compared with 0.639 s on Earth.
Escape speed, the speed at which you leave for good, is 23.5 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
- Uranus 70 kg reads 63.3 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 Neptune’s cloud tops?
79.6 kg (175 lb). The ratio to Earth is 1.14, from g = 11.2 m/s² against 9.81 m/s².
Does my mass change at Neptune’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 114% of its Earth value.
How do I work out my weight at Neptune’s cloud tops?
Multiply your Earth weight by 1.14. In kilograms or pounds the answer comes out in the same unit, because the ratio has no unit.
Could anyone stand at Neptune’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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