How Much Does Earth Weigh Compared to Other Planets
Earth weighs 5,972 trillion tons, written out in full: 5,972,000,000,000,000,000,000 tons. It sounds like a made-up number, but it’s the real mass of our planet, calculated from its gravity and volume. Compared to the rest of the solar system, Earth is a marble: Jupiter weighs 318 times more, and the Sun contains 99.86% of all the mass in the solar system. Let’s put these figures into real perspective.
How much Earth weighs in kilograms and tons
Earth’s mass is 5.972 x 10^24 kilograms. If you prefer to see it in tons, the figure is 5.972 x 10^21 metric tons, meaning 5,972 trillion tons (using the long scale, where a trillion equals 10^18). To grasp the magnitude: if you could put Earth on a giant scale, you’d need to stack more than a thousand billion times the weight of all humanity combined to match it.
This figure isn’t measured with a scale, of course. Scientists calculate planetary mass from the gravitational constant and the acceleration of gravity at the surface, combined with the planet’s radius. It’s an indirect but extremely precise calculation, further confirmed by the orbits of satellites and space probes.
How the mass of a planet is calculated
The formula stems from Newton’s law of universal gravitation. Knowing the gravitational force a planet exerts on an object at its surface (or on a moon orbiting it) and the distance between them, the mass can be derived. For Earth, this calculation is constantly refined with satellites like those from the GRACE mission, which measure minimal variations in Earth’s gravitational field.
What’s interesting is that this same method works for any celestial body with something orbiting it. That’s why we know the mass of planets with moons so precisely, and with somewhat less accuracy the mass of bodies without natural satellites.
Earth’s mass vs Jupiter: the gas giant
Jupiter has a mass of 1.898 x 10^27 kilograms, equivalent to 318 times Earth’s mass. If you could merge two and a half Earths into Jupiter every day for a year, you still wouldn’t match its mass. In fact, Jupiter alone accounts for more than 70% of all planetary mass in the solar system, excluding the Sun.
To give you a visual idea: if Earth were a one-euro coin, Jupiter would be a beach ball. That scale jump is hard to imagine, which is why comparing diameters helps just as much as comparing masses: you can check how the Sun’s size compares to Earth in this article about the Sun’s diameter to better understand the solar system’s proportions.
Planet weight compared: from Mercury to Neptune
Here’s the mass of each planet expressed relative to Earth (Earth = 1):
- Mercury: 0.055 Earth masses (330,000 trillion tons)
- Venus: 0.815 Earth masses
- Earth: 1 (5,972 trillion tons)
- Mars: 0.107 Earth masses
- Jupiter: 318 Earth masses
- Saturn: 95 Earth masses
- Uranus: 14.5 Earth masses
- Neptune: 17.1 Earth masses
Notice a curious fact: Neptune weighs more than Uranus even though it’s smaller in diameter. This happens because its internal composition is denser, with more ice and compressed rock beneath its gaseous atmosphere. Mass and size don’t always go hand in hand.
Why density matters as much as mass
Earth is the densest planet in the solar system, at 5,514 kilograms per cubic meter. Jupiter, despite weighing 318 times more, has a density of only 1,326 kg/m³, barely above that of water. This is because Jupiter is made mainly of hydrogen and helium in gaseous and liquid states, while Earth has a solid metallic core of iron and nickel.
If Jupiter had Earth’s density, its mass would be so extreme it would likely collapse under its own gravity into even more extreme forms. That density difference is key to understanding why rocky planets (Mercury, Venus, Earth, Mars) are much more compact than gas giants.
The Sun: the true heavyweight of the system
All talk of planetary mass pales in comparison to the Sun. Its mass is 1.989 x 10^30 kilograms, equivalent to 333,000 times Earth’s mass. The Sun concentrates 99.86% of all the mass in the solar system; all the planets, moons, asteroids, and comets combined represent barely the remaining 0.14%.
This extreme disproportion is why the Sun gravitationally dominates the entire system and why planets orbit around it rather than the other way around. If you want to go deeper into how these magnitudes compare to even more massive objects, in this article about how much a black hole weighs compared to the Sun you’ll find an even more extreme perspective.
Converting planetary mass into units we understand
Working with numbers like 5.972 x 10^21 tons feels abstract to almost anyone. That’s why, when you need to handle large mass or weight figures in your daily life (even if they’re much smaller than planetary ones), it helps to have a tool that converts units without margin for error. If you regularly work with figures in kilograms and need to convert them to tons for reports, load calculations, or simply to better understand a magnitude, you can use Glosaria’s convert kilograms to metric tons calculator: it’s instant and requires no manual calculations with exponents.
What it would be like to live on another planet based on its mass
A planet’s mass directly determines its surface gravity, and that gravity determines how much you would weigh if you stood there. On Jupiter, for example, your weight would multiply by 2.4 compared to Earth, though you could never actually stand on its surface since it has no solid surface. On Mars, however, you would weigh only 38% of what you weigh here.
If you’re interested in seeing these calculations applied to your own body weight on each planet, in this article about how much you would weigh on each planet in the solar system you’ll find the exact figures planet by planet.
Frequently asked questions
How much does Earth weigh exactly in kilograms?
Earth has a mass of 5.972 x 10^24 kilograms, equivalent to 5,972 trillion metric tons. This figure is calculated from the gravitational constant and Earth’s gravitational acceleration, and is constantly refined with satellite data.
How much does Earth weigh compared to Jupiter?
Jupiter weighs 318 times more than Earth. While Earth has a mass of 5.972 x 10^24 kilograms, Jupiter reaches 1.898 x 10^27 kilograms, making it the most massive planet in the solar system.
What is the lightest planet in the solar system?
Mercury is the planet with the smallest mass in the solar system, with only 5.5% of Earth’s mass, about 3.301 x 10^23 kilograms. Even so, it’s still a dense rocky body, not a lightweight object in absolute terms.
Why is Earth denser than much larger planets?
Earth has a density of 5,514 kg/m³ because its composition includes a solid metallic core of iron and nickel. Planets like Jupiter or Saturn, though far more massive, are composed mostly of gases like hydrogen and helium, which drastically reduces their average density.
How do scientists know a planet’s mass without being able to weigh it?
It’s calculated using the law of universal gravitation, measuring how the planet gravitationally affects nearby objects such as moons, satellites, or space probes. From that gravitational interaction and the distance between the bodies, the mass is derived with great precision.