See your weight shift from Earth to Moon. Switch units, customize gravity, and round outputs. Download results, review steps, and share with students easily.
| Mass (kg) | Earth weight (N) | Moon weight (N) | Moon weight (kgf) |
|---|---|---|---|
| 50 | 490.33 | 81.25 | 8.285 |
| 70 | 686.47 | 113.75 | 11.599 |
| 90 | 882.60 | 146.25 | 14.913 |
Weight (force): W = m × g
Conversions: 1 kgf = 9.80665 N, and 1 lbf = 4.4482216152605 N.
Physics note: your mass stays the same, but your weight changes because gravity is different.
Scales measure force, not mass. Mass is the amount of matter, while weight is the gravitational pull on that mass. Moving from Earth to the Moon leaves mass unchanged, but lower gravity reduces the force a scale reports.
This calculator defaults to 9.80665 m/s² on Earth and 1.625 m/s² on the Moon. The ratio is about 0.166, so Moon weight is roughly 16.6% of Earth weight. Override either value to model local conditions or alternative references.
The model uses W = m × g, where W is weight (newtons), m is mass (kilograms), and g is gravitational acceleration. Mass input computes Earth and Moon weights directly. Earth-weight input recovers mass with m = WE/gE.
Mass input suits lab problems and object specs because mass is stable across locations. Earth weight input is practical because it matches what a scale displays. Both paths converge to the same mass estimate, then apply Moon gravity to obtain Moon weight.
Results appear in newtons (N) plus common force units. The calculator uses 1 kgf = 9.80665 N and 1 lbf = 4.4482216152605 N. When you input pounds of mass (lb), it converts to kilograms using 0.45359237. Multiple outputs help translate between classroom and scale-style units.
Suppose a person has a mass of 70 kg. On Earth, WE ≈ 70 × 9.80665 = 686.47 N. On the Moon, WM ≈ 70 × 1.625 = 113.75 N. The same person would still be 70 kg in mass, but the scale force would feel much lighter in teaching demos.
Rounding changes display precision, not the underlying physics. For presentations, 2–4 decimals often balances clarity and accuracy. Small changes in gravity scale the result linearly, so a 1% change in g produces a 1% change in weight. The model assumes uniform gravity. For mission comparisons, keep more decimals and record the g values used.
Use the export buttons to save your calculation as CSV for spreadsheets or as a simple PDF for sharing. Exports include mass, Earth and Moon gravities, weights in N/kgf/lbf, plus the Moon/Earth ratio and percent. This supports assignments, quick checks, clean lab notes, and later reference.
No. Mass is an intrinsic property and does not depend on location. Only the gravitational force changes, so your weight reading becomes smaller while your mass stays the same.
It is a widely used average surface gravity for the Moon. Local values vary slightly with latitude and terrain, so the calculator lets you replace it with a custom value.
kgf is kilogram-force, a force unit defined as the weight of 1 kg under standard gravity (9.80665 m/s²). It is convenient for comparing scale-like readings with newtons.
Yes. Choose the Earth weight input type and select lbf (pound-force). If you only know pounds of mass, select Mass input and use lb instead.
Newtons are the SI unit of force and match the formula W = m × g directly. The calculator also provides kgf and lbf for users who prefer scale-oriented units.
It is as accurate as the gravity values you choose. With defaults, Moon weight is about 16.6% of Earth weight. Changing Earth or Moon gravity updates the ratio instantly.
Only if you include it in the input. Add the mass of gear to your mass value, or add the corresponding Earth weight if using the Earth weight mode, then recalculate.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.