Mass and weight are the same number only on Earth
Mass is a fixed property of an object — how much matter it's made of — and it doesn't change no matter where that object is. Weight is the force gravity exerts on that mass, and gravity varies by location, so weight changes even when mass doesn't.
Weight (force) = Mass × Gravitational acceleration
70 kg × 9.80665 m/s² ≈ 686.5 N (about 154.3 lbf) on Earth
Everyday speech treats "weight" and "mass" as interchangeable because everyone shares the same planet and the same gravity — the units even get mixed together, with a bathroom scale reporting kilograms even though it's technically sensing a force. The distinction only starts to matter once gravity is no longer a constant, which is exactly the situation the Weight on Planets mode is built for.
Konversi satuan berat umum
| Satuan | Equivalent |
|---|---|
| 1 kilogram | 2.20462 lb |
| 1 stone | 14 lb |
| 1 ounce | 28.3495 g |
| 1 US (short) ton | 2,000 lb |
| 1 metric tonne | 1,000 kg (≈2,204.6 lb) |
The US short ton and the metric tonne look interchangeable but aren't — mixing them up on a shipping manifest or a materials spec is off by about 10%, which matters at any real scale.
What the same mass would weigh elsewhere
Setiap planet memiliki gravitasi permukaannya masing-masing, sehingga massa 70 kg yang sama menghasilkan pembacaan berat yang sangat berbeda tergantung di mana ia berdiri.
| Body | Gravity vs. Earth | 70 kg person would weigh |
|---|---|---|
| Moon | ~0.166× | ~11.6 kg |
| Mars | ~0.378× | ~26.5 kg |
| Jupiter | ~2.53× | ~177 kg |
Penghitungannya adalah rasio dua gaya gravitasi yang diterapkan terhadap berat Bumi — secara matematis, tidak ada bedanya dengan konversi antara pasangan satuan lainnya, hanya dengan percepatan gravitasi sebagai faktor konversi.
Related conversions
For mass-specific unit conversions with a deeper look at troy vs. avoirdupois ounces and long tons, see the kalkulator massa. Pairing weight with a physical size gives you density — the density calculator covers that — and for body measurements more broadly, the kalkulator tinggi badanmencakup konversi umum lainnya yang dicari orang selain berat badan.