Planet Gravity Laboratory
Your mass stays the same everywhere. Your weight does not.
On Mars (gravity 3.71 m/s²) you would weigh 259.7 N — a scale would read about 26.482 kg. Your mass (70 kg) never changes.
Model assumptions
Mean surface gravity per planet (NASA fact sheets).
Reference: NASA planetary data; Newtonian mechanics. This is an educational model, not an ephemeris.