If you're trying to level up pets in Roblox Pet Simulator 170 and noticing stats aren’t increasing the way you expect, the stat growth formula is likely why. It’s not random every pet’s HP, damage, speed, and other stats follow a specific calculation based on level, rarity, and base values. Knowing how it works helps you plan upgrades, compare pets fairly, and avoid wasting time on underperforming ones.

What does “Roblox Pet Simulator 170 stat growth formula” actually mean?

The stat growth formula is the math behind how much each stat increases when your pet levels up. For example, a common pet might gain +8 HP per level, while a legendary one gains +22 HP per level but only if its base HP and growth multiplier align correctly. The formula uses three inputs: the pet’s base stat (set at spawn), its rarity-based growth rate, and its current level. It’s not just “+X per level” it’s often quadratic or scaled with diminishing returns after certain thresholds.

When do players actually use this formula?

You’ll need it when deciding which pet to invest in, especially before fusing. Say you’re choosing between two level 100 pets: one has high base damage but low growth, another has lower base damage but scales faster past level 120. Without checking the growth curve, you might pick the wrong one. It also matters when testing new pets if a newly hatched pet’s stats don’t match expected values at level 5 or 10, something may be off with its rarity tag or data ID.

How does rarity affect stat growth?

Rarity changes the multiplier applied to each stat’s growth. A Mythic pet doesn’t just start higher its damage and HP scale more aggressively than a Rare or Epic pet at the same level. That’s why understanding how rarity influences scaling helps you read the formula correctly. If you assume all legendaries grow the same way, you’ll misjudge pets like “Void Serpent” vs. “Celestial Wolf,” which have different base values even at the same rarity.

Common mistakes people make

  • Assuming stat bars update instantly after leveling some pets show delayed stat application until relog or rebirth.
  • Using old community charts that haven’t been updated for Patch 170’s adjusted multipliers (many pre-170 guides still float around).
  • Forgetting that fusion resets level but preserves growth rate so fused pets inherit the higher rarity’s scaling, not the sum of both.
  • Confusing “stat cap” with “growth rate”: caps limit max possible values, but growth rate determines how fast you approach them.

A quick example using real numbers

Take the “Lunar Fox” (Epic rarity). Its base HP is 140, and its HP growth rate is 1.3x per level. At level 1, HP = 140. At level 50, it’s roughly 140 + (1.3 × 50) = ~205 but because the actual formula includes a small quadratic term, it’s really 208. That 3-point difference matters when comparing against a “Solar Lynx” (Legendary, base 95, growth 1.8x), which hits 207 HP at level 50. Tiny differences add up over 200+ levels.

Where to find accurate growth values

The most reliable source is the game’s internal data specifically the PetData module in decompiled versions, where each pet’s BaseStats and GrowthRates are defined. Community tools like the Pet Simulator 170 Stat Calculator pull from that data, but always cross-check with in-game values at level 1, 10, and 50. You can also verify growth consistency by checking how much a pet’s damage increases after three consecutive level-ups flat increases suggest linear growth; widening gaps suggest quadratic behavior.

Why fusion success probability matters here

Fusion changes rarity, which directly changes growth rates. But if your fusion fails, you keep the original pet meaning its growth stays unchanged. So if you’re aiming for a specific stat curve, knowing the odds of upgrading rarity helps you decide whether to risk fusing now or wait for better odds or materials.

Next step: test it yourself

Open Pet Simulator 170, hatch two pets of the same type but different rarities (e.g., Rare and Epic “Crimson Drake”), level them to 20 using only XP fruits (no boosts), then write down their HP and damage at levels 1, 5, 10, and 20. Compare the differences. If the Epic grows ~1.6x faster in HP than the Rare across all four points, you’ve confirmed the scaling pattern matches expectations. If not, double-check rarity tags or look for hidden modifiers sometimes event pets use alternate formulas.