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Lizely

Weight on Other Planets Calculator

Compare one Earth scale reading across all eight planets using source-checked JPL equatorial gravity values.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Enter a positive scale reading measured on Earth.
  2. 2.Choose a display label, then select Compare planetary weight.
  3. 3.Read each planet’s equatorial gravity and equivalent value, remembering that mass stays constant and the figures are educational approximations.

About Weight on Other Planets Calculator

Weight on Other Planets Calculator compares one Earth scale reading with the equivalent pull produced by the equatorial surface gravity of each of the eight planets. Enter a positive value, keep the unit you normally use, and the table shows Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune side by side. The calculation runs locally and does not store personal measurements.

Weight and mass are different physical quantities. Mass describes the amount of matter and does not change when an object travels to another planet. Weight is a force produced by gravity. NASA expresses the relationship as W = mg: weight equals mass multiplied by gravitational acceleration. This calculator therefore multiplies an Earth scale reading by each planet’s gravity divided by the Earth reference gravity.

The reference table comes from NASA/JPL Solar System Dynamics. Its equatorial gravity values are 3.70 m/s² for Mercury, 8.87 for Venus, 9.80 for Earth, 3.71 for Mars, 24.79 for Jupiter, 10.44 for Saturn, 8.87 for Uranus, and 11.15 for Neptune. Tests pin all eight entries, require eight unique planet names, and reproduce NASA’s familiar educational anchors: an Earth reading of 100 is roughly 38 on Mercury and 253 on Jupiter.

You may label the input as pounds, kilograms, newtons, or a custom unit. Pounds and newtons are force units. A household scale labeled kilograms infers mass from Earth gravity, so the displayed kilogram result is a scale-equivalent reading rather than a statement that mass changed. The ratio itself is unitless, which is why the same numeric comparison can be displayed with a chosen label.

The numbers are educational approximations. JPL’s table reports equatorial surface gravity, not a universal value at every location. Actual effective gravity varies with latitude, altitude, rotation, local geology, and the reference radius. Gas and ice giants do not offer a solid surface where a person could stand; their tabulated gravity is associated with a defined reference level. Real spacecraft, atmospheric motion, and free fall also require a more complete physical model.

The calculator includes only the eight IAU-recognized planets. It does not include the Moon, Pluto, dwarf planets, asteroids, stars, or exoplanets. It does not calculate gravitational force from arbitrary mass and radius, escape velocity, orbital weight, atmospheric buoyancy, or biological effects. It is not a health, fitness, or dosing calculator, even if the starting number came from a bathroom scale.

Results use the published gravity values as displayed and show a practical rounded decimal. Because the source values are rounded and local gravity varies, adding more decimal places would create false precision. For classroom work, cite the JPL table and state that the comparison uses equatorial gravity. For engineering or mission analysis, use the body-specific gravity model, altitude, reference ellipsoid, and uncertainty required by the project.

All processing occurs in the current browser tab. Changing the input clears the previous table so a stale comparison is not mistaken for a new one. Review the Earth row first: it must equal the entered reading. Then compare the Mercury and Jupiter rows as quick reasonableness checks before using the remaining educational values.

Methodology & sources

Use NASA/JPL equatorial gravity values for the eight planets and Earth reference g=9.80 m/s². Validate a positive finite Earth reading, calculate each equivalent as input × planet gravity / Earth gravity, retain the user-selected display label, and round for practical presentation. Pin all eight source values and cross-check the 100-unit Mercury and Jupiter results against NASA educational examples.

Frequently asked questions

Does my mass change on another planet?
No. Mass remains the same; weight changes because gravitational acceleration differs.
Why can I select kilograms?
A kilogram-labeled household scale infers mass from Earth gravity, so this page displays a familiar scale-equivalent reading rather than changed mass.
Could someone stand on Jupiter to measure this?
No. Jupiter has no solid surface; the listed gravity refers to a defined equatorial reference level.
Are these values exact everywhere on each planet?
No. They are rounded JPL equatorial values, while effective gravity varies with location, altitude, and rotation.

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