A pet's rank is the single most underrated stat in Catch a Monster. It runs from E at the bottom to SS at the top, and it works as a flat multiplier on a pet's damage and HP. The same monster at SS is roughly five times as strong as it is at E — which is why ranking up a pet you already own often beats catching another fresh one.
What rank actually does
Think of every monster as having a set of base stats — the values it would have at rank E. Its rank then multiplies those base stats. Damage and HP both scale; crit chance, element, rarity, and skills do not change with rank. So rank is purely a power dial on the two numbers that decide how hard a pet hits and how long it lives.
The E → SS multiplier table
These are the exact multipliers the game applies, relative to a pet's E-rank base stats:
| Rank | Multiplier (× base) | Step over previous |
|---|---|---|
| E | 1.00× | — |
| D | 1.30× | +30% |
| C | 1.69× | +30% |
| B | 2.197× | +30% |
| A | 2.8561× | +30% |
| S | 3.7129× | +30% |
| SS | 5.04× | +35.7% |
The hidden pattern: +30% per rank, then SS breaks the curve
Look closely at the step column. From E all the way to S, every single rank is a clean ×1.30 on the one before it — the multipliers are just 1.30 compounded (1.30, 1.69, 2.197, 2.8561, 3.7129). The game is perfectly geometric through that range.
Then SS breaks the pattern. Instead of another +30% step (which would land around 4.83×), SS jumps to 5.04× — a roughly +35.7% leap over S. That extra kick is why SS pets feel disproportionately strong: you're not just paying for one more rank, you're paying for a bigger-than-normal one. If you can push a strong pet to SS, the payoff is larger than any earlier step.
A worked example
Say a monster has 100 base damage at rank E. Here's what that same pet hits for at each rank:
| Rank | Damage (from 100 base) |
|---|---|
| E | 100 |
| D | 130 |
| C | 169 |
| B | 220 |
| A | 286 |
| S | 371 |
| SS | 504 |
Same monster, same base stats — but the SS version deals 504 where the E version deals 100. HP scales by the exact same multipliers. This is also why a high-rank lower-rarity pet can out-perform a low-rank rare one: an S-rank pet at 3.71× can beat a D-rank pet at 1.30× even if the rare has somewhat higher base stats.
Reading any pet's real numbers
You don't have to do this math by hand. Every pet page on the wiki shows a full E → SS table with that specific monster's damage and HP at each rank, using the multipliers above on its community-verified base stats. Open any pet on the wiki and the "stats by in-game grade" table does the work for you.
For the deeper math — how level, mutation, Evolution Materials, and enhancement stack on top of rank — the fuse & enhance calculator models the full pipeline.
What this means for how you play
- Invest rank into pets you'll keep. Because the multiplier is so steep, a pet you take to S or SS is worth far more than two pets stuck at C.
- SS is the goal for your carries. The bigger-than-normal SS step makes it the most cost-effective top-end rank to chase on a pet that's already strong.
- Don't judge a pet by rarity alone. Rank can more than make up a rarity gap. Compare actual numbers on the tier list and wiki before committing.
New here? Start with the Beginner's Guide, then use the Team Building guide to put your highest-rank pets into a party that actually covers its matchups.