Slime RNG Luck Calculator
Pick your chase target, stack your boosts, choose how many rolls you'll send — and see the real probability you'll see one drop. Maths based on community-verified luck multipliers.
- Targets
- 7 slimes
- Boost stacks
- Multiplicative
- Live model
- v1.6.0
The Slime RNG luck calculator turns opaque "1 in X" odds into honest numbers: your real probability of hitting a chase slime, and the rolls you actually need at your current luck stack. Every multiplier in the model is multiplicative — that's why stacking codes, Apples, an equipped Lucky Slime and rebirth bonuses matters so much.
Need fresh boosts before rolling? Grab every active code from the codes page. Picking the right chase target? Cross-check the tier list first.
① Pick your chase target
② Stack your boosts
③ How many rolls?
✦ Your odds for Void Slime
Effective per-roll odds
1 in 10M
≈ 0.10× 10⁻⁴ % per roll
Cumulative chance after 1,000 rolls
100.00× 10⁻⁴ %
Total Luck
×1.00
Mean rolls to drop
10,000,000
💡 How it works
Boosts multiply together (not add), so stacking them is dramatically better than spreading them out. Cumulative odds use the geometric distribution: 1 − (1−p)ⁿ.
Note: in-game multipliers are based on community testing — actual values may shift after patches.
Slime RNG luck calculator · FAQ
Quick answers about luck stacking, multiplier maths and chase-slime expectations.
How does the Slime RNG luck calculator work?
Pick a chase slime, toggle the Luck Boost / Apple / Lucky Slime / rebirth multipliers you actually have active, and set how many rolls you plan to send. The calculator multiplies every active boost (luck stacks are multiplicative, not additive) and runs the resulting probability against your roll count to show your real chance of hitting at least one drop.
Are luck multipliers additive or multiplicative in Slime RNG?
Multiplicative — every active luck source compounds with the others. A 2× Luck Boost + 1.5× Apple + 1.5× equipped Lucky Slime gives you 2 × 1.5 × 1.5 = 4.5× total luck, not 2 + 1.5 + 1.5 = 5×. This is exactly why stacking matters so much for rare chase pulls.
What's the best luck stack for Void Slime?
For the 1-in-10,000,000 Void Slime chase: Ultra Luck Boost (2.5×) + Apple (1.5×) + equipped Huge Lucky (1.75×) + 3 rebirths (2.0×) = ~13× effective luck. That brings the effective denominator from 10M down to ~770k — still brutal, but actually attainable in a focused weekend session.
How many rolls do I realistically need for an SSS-tier slime?
At full luck stack (~13× multiplier), expect ~700k rolls for a 50% chance at any 1-in-10M slime. Mid-tier rares (1-in-50k odds) clear in ~3,500 rolls at the same stack. Use the calculator to dial in your exact target — 'rolls needed' is far more honest than the raw '1 in X' you see in-game.
Do codes affect my luck for the calculator?
Yes — most active Slime RNG codes grant a Luck Boost or Apple. Redeem every working code from the codes page before opening a roll session, then set the corresponding boost toggles in this calculator. Codes are a free luck multiplier you should never skip.