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Limbo Provably Fair Verifier

Recompute the Limbo crash multiplier from your revealed seeds — with the formula checked bit-for-bit against Stake's own calculator.

Computed locally via the Web Crypto API (HMAC-SHA256). Your seeds and nonce are never sent anywhere — the only network request on this page is an anonymous, cookieless page-view counter (page path + referring page, nothing you type). It's the same code we test against Stake's own calculator.

We check more than your round. This confirms one Limbo result. Whether the generator is fair overall is what our independent RNG audits answer — millions of real rounds against NIST SP 800-22 + PractRand. Anyone can verify a round; almost nobody audits the generator.

How Limbo provably fair works

In Limbo you pick a target multiplier and win if the round's multiplier lands at or above it. A single float becomes that multiplier. Sounds simple — but it's the game where verifiers most often go wrong.

The result comes from the standard Stake-style byte stream:

HMAC-SHA256( key = server_seed , message = "client_seed:nonce:round" )

The exact Limbo formula

One float f maps to the multiplier:

crash = 16777216 / ( floor( f × 16777216 ) + 1 ) × 0.99

The key is 16777216 = 2²⁴. Stake's older published documentation shows a formula based on 1e8 instead; Stake's live calculator uses 2²⁴, and so do we. Verifiers built from the 1e8 formula can disagree with Stake's calculator, mostly at high multipliers. The +1 also prevents a divide-by-zero when f = 0.

Frequently asked questions

How is the Limbo multiplier calculated?

One float f is turned into 16777216 / (floor(f × 16777216) + 1) × 0.99. That 0.99 is the 1% house-edge factor applied to the raw multiplier.

Why do other Limbo verifiers sometimes give a different high multiplier?

Some follow the 1e8 formula from Stake's older documentation instead of 2²⁴ (16777216). At high multipliers the two can differ. Stake's own /provably-fair/calculation page uses 2²⁴ — we checked ours against it.

Can a Limbo result be predicted in advance?

No. With the server seed still hashed, the multiplier is unknowable. This tool only checks a round after the seed is revealed.

Does this Limbo verifier work for other casinos?

It is tested against Stake / Stake.us. Other casinos match only if they use exactly Stake's Limbo formula — not tested by us, so check one known round first.

Formula checked bit-for-bit against Stake.us' own calculator (Aug 2026). Other casinos not tested. Other games: Dice · Limbo · Plinko · Mines · Keno · all verifiers. Open methodology: /methodology/. © FairPlay Audit — independent, free and open source (MIT).