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Mutation Calculator

Rainbow odds under any luck boost · your chance in N catches · the 50% threshold

Rainbow odds
1 in 200
Chance in 200 catches
63.3%
Expected Rainbows
1.00
50% chance at
~139 catches
Reading this: Rainbow base odds are community-tracked at 1 in 200 and scale with luck. INFINITE size (≥7x) rolls independently — a Rainbow INFINITE (≥140x income) needs both rolls, which is why luck windows matter for jackpot hunts. These are probability estimates, not guarantees — variance is huge at 1-in-200.

base odds: community cross-checked (≈1/200); luck multipliers: official boost labels (2x-16x, 100x).

How To Hunt With These Numbers

The calculator exists to answer one practical question: is this hunt worth starting right now? The decision logic: check your luck situation first (a shared 16x window multiplies the whole table), then set a realistic catch budget — say, the throws you'll make in one session — and read the chance column. At 100 catches under 16x luck you're already near 99.6% for at least one Rainbow; at no boost, the same 100 catches is a coin flip at ~39%. Same effort, completely different expected outcome — which is the entire argument for hunting during luck windows instead of grinding blind.

The second use is value targeting: pair this with the income calculator to price what a Rainbow is actually worth on your best animal. A Rainbow on a Waste Harvester adds roughly $7.8Dd per second — numbers that reframe whether a 159-Robux luck window was "expensive." For the full multiplier stack (Rainbow × INFINITE size × Gold) and the tags-before-selling rule, see the mutations guide.

One honesty note baked into the tool: the 1-in-200 baseline is a community statistic that the game doesn't officially publish, and luck's exact formula is opaque. If better data lands, both the calculator and the data page update together — we'd rather revise than defend a wrong number.

FAQ

What are the base Rainbow odds in Throw Food For Animals?
Community tracking puts a Rainbow mutation at roughly 1 in 200 catches. It's the most reliable published figure — cross-checked between the major tier databases — but it's a community statistic, not an official constant. Treat results as planning numbers, not guarantees.
How does luck affect mutation odds?
Luck multiplies your odds: Server Luck boosts scale 2x to 16x (shared with everyone in your server for 15 minutes), and Super Lucky Throws apply 100x luck per throw. The calculator applies your boost linearly to the base odds — under a 16x window, Rainbows run at roughly 1 in 12.5 catches, which is why hunts are timed to luck windows.
What's the difference between Rainbow and INFINITE size odds?
They're separate rolls. Rainbow (x20 income) runs at the 1-in-200 baseline; INFINITE size (at least 7x income) rolls independently with less precisely tracked odds. A Rainbow INFINITE needs both — the calculator's Rainbow math covers one roll; the jackpot case multiplies both effects on top of the animal's base.
Why does 200 catches only give ~63% chance, not 100%?
Probability compounding: at 1-in-200 odds, 200 catches yields 1-(199/200)^200 ≈ 63%. The '50% chance at ~139 catches' figure is the honest midpoint. This is why hunters farm while hunting — the expected-value play is letting consistent income ride while the rare roll comes in its own time.
Is it worth buying luck boosts just for mutations?
The math favors shared boosts over solo purchases: in a busy server, other players' Server Luck purchases give you free windows, so ride those first. Solo 16x purchases (159 Robux) make sense for targeted jackpot hunts — a Rainbow on a deep-zone animal repays the cost many times over. Storable Super Lucky Throws are best saved for new-map launches.
Should I use this calculator to decide when to stop hunting?
Use it to set expectations, not stop rules. If you've thrown 300 catches during a 16x window without a Rainbow, that's unlucky but not broken (about a 22% chance of that dry spell). The stop signal in this game is economic — when your income rate makes the next food tier trivial — not probabilistic.

Data checked November 8, 2026. Throw Food For Animals updates often — we re-verify numbers after each update.

How To Use The Mutation Calculator (Step By Step)

Step one — check your luck situation before the hunt. This is the input that changes everything, and it's free to check: are you in a busy server where other players' Server Luck purchases keep windows rolling? Run the calculator at 16x and at No boost to see the gap — at a 200-catch budget, that's the difference between a near-certain Rainbow and a two-in-five coin flip. If your server is quiet and you're not buying boosts, plan around the baseline honestly instead of borrowing optimism from a luck window you won't have. Step two — set a realistic catch budget. A "session" in the deep zones is dozens of throws, not hundreds; set the number you'll actually throw and read the chance column without flinching. The tool's honest percentages are why the rare hunting guide insists on farming-while-hunting — at real odds, hunting without income riding on the side is a losing activity by definition.

Step three — compare windows before spending. The Robux decision version: run 50 catches at No boost versus 50 at 16x versus 50 at 100x. The at-least-one column shows why stored Super Lucky Throws (100x each) are treated as ammunition rather than snacks — fifty throws under stacked luck approaches certainty that fifty naked throws never reach. When a new map opens (the Nuclear Wasteland being the current example), this math is how the fast movers justify their stockpiles: fresh rosters plus maximum luck equals the year's best mutation odds.

Step four — convert odds into income. The last step pairs with the income calculator: once you know your Rainbow chance, price what the Rainbow adds. Expected value = chance × the Rainbow delta on your best animal — and on a Waste Harvester, that delta runs to decillions per second, which reframes every luck purchase on the shop page from "expense" to "lottery ticket with a payout schedule." The players who hunt well aren't luckier; they just time the same odds better.

A closing caution about variance: the percentages here are population math, not personal promises. At 1-in-200, a 300-catch dry spell happens to roughly one hunter in five — unlucky, not broken. The correct response to a dry spell is checking your inputs (was the window real? were throws landing in the back third?) rather than concluding the odds are wrong. The tool holds its numbers to the same standard: when better mutation data lands, it revises.