Neptune is the smallest of the gas giants in the Solar system. And yet, it is considerably bigger than Earth. It is so big that you could fit 57 Earth-sized planets into it.
With that in mind, Neptune’s gravity should be much stronger, right?
Well, you might be surprised to know that that’s not the case. Neptune’s gravity is only 14% stronger than Earth’s. Why is that the case?
Well, the answer is that the mass of the gas planets is distributed across a greater volume, and as a result, these planets have very low density, and therefore, a lower gravitational acceleration. As a result, even though the mass of these planets is much greater than Earth’s, their gravity doesn’t increase at the same rate.
So, how much would you weigh on Neptune?
Below you will find a calculator that can answer that for you with precision. But before we get to that there’s something that must be clarified.
A person can’t stand on Neptune because the planet is made out of gas. It does not have a solid surface to walk on. If you were to “fall” into the planet, you would sink all the way into its core. There would be nothing would stop you. Well, that is except for the low temperatures, crushing pressure, supersonic winds, and toxic atmosphere that would destroy you long before you could reach the core but let’s say you had a way to survive all that.
For the purpose of this exercise then, if you wanted to calculate how much would you weigh on Neptune, we will need to imagine that the planet does somehow have a solid surface. Now that that’s cleared up, let’s proceed.
In this imaginary Neptune-like planet, you would weigh approximately 14% more than your current weight on Earth. A person who weighs 70 kilograms (154 lbs) on Earth would weigh approximately 79.5 kilograms (175 lbs) on Neptune.
On top of that, to walk on this imaginary version of Neptune, you would have to add up the weight of the spacesuit required to survive.
To give you an idea of how heavy astronaut suits are, the spacesuits that the Apollo astronauts used to walk on the Moon weighed about 163 kilograms (360 pounds) on Earth. On the Moon that weight was reduced to just 27 kilograms (60 pounds) which is still a lot, but it is manageable. On Neptune, the weight of this equipment would be even greater, making it much harder to carry around.
To precisely calculate your weight on Neptune, you can use a simple rule of three that factors in the difference between the force of gravity on both planets.
The following calculator simplifies the process.
Weight on Neptune calculator
If you want to skip the calculation, just fill out the following calculator. The kg / lb switch changes the unit.
The result updates as you type. Add your birthday to see your age on the same planet too.
Results for a 100 lb person aged 10 years.
Neptune
Weight on Neptune113.66 lb
Age on Neptune0.06 years
- Next birthday
- Add your birth date
- Jump
- 1.44 ft
- Year
- 164.79 Earth years
- Day
- 16.11 hours
No solid surface: measured at the cloud tops
Your weight on the other worlds
- Mercury37.72 lb41.52 years
- Venus90.42 lb16.25 years
- Moon16.51 lbn/a
- Mars37.82 lb5.32 years
- Jupiter252.70 lb0.84 years
- Saturn106.42 lb0.34 years
- Uranus90.42 lb0.12 years
- Pluto6.32 lb0.04 years
- Sun2,793.07 lbn/a
See your age and weight on every planet →
Homework mode: show the working
Enter a mass in kilograms and an age in years. Every answer below shows the formula with your numbers.
Did you mean Neptune itself?
If you were looking for the world rather than your own numbers, here is how heavy and how old Neptune is, next to Earth.
| Body | Mass | Compared with Earth | Age |
|---|---|---|---|
| Neptune | 1.02 × 1026 kg | About 17 Earths | 4.5 billion years |
| Earth | 5.97 × 1024 kg | The reference: 1 Earth | 4.54 billion years |
Gravity, orbit and rotation figures: NASA NSSDCA planetary fact sheets.
Want the other planets too? See your weight and age on every planet, plus how high you could jump on each one.
Weight on Neptune formula
The formula to calculate your weight on Neptune is as follows:
WNeptune = (WEarth / 9.81) * 11.15
WNeptune: Weight on Neptune
WEarth: Weight on Earth
The other two numbers are the force of gravity on each planet and it is given in meters per square second (m/s2). The force of gravity on Earth is 9.81 m/s2 and on Neptune, it is approximately 11.15 m/s2.
