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Isabelle Grant

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Isabelle Grant, writer on bankroll and casino mathematics
Writer on bankroll and casino mathematics

Isabelle writes about the arithmetic of play — house edge, variance, loyalty tiers and bankroll rules — using calculations the reader can check rather than data nobody can see.

2 Languages
4 Guides published
3 External sources cited
House edge arithmetic Variance and sample size Expected value Loyalty programme mechanics Wagering requirements Bankroll structure Unit sizing Cost of play

About Isabelle Grant

Isabelle Grant writes the mathematics guides on this site: house edge, variance, loyalty programmes and bankroll structure.

Her guides are built from published figures — the return percentage in a game's information panel, the wagering multiple in a set of bonus terms — and from arithmetic the reader can repeat. No calculation appears without the inputs it was made from.

She writes for this site independently, is not employed by any operator, and has no access to player or operator data. Where a figure would require that access, her guides label the example as illustrative rather than presenting it as measured.

She does not publish simulation results, and one of her guides explains why: a simulation large enough to be meaningful converges on the house edge, which the game already publishes.

Her guides state the limit of what bankroll management does. It buys time and stability; it does not turn a negative-expectation game positive, and no staking rule ever has.

The recurring point in her writing is that the only measure worth keeping is the one from your own account — total deposited and total withdrawn, monthly.

Background & Credentials

  • Writes the four mathematics and bankroll guides on this site
  • Publishes the inputs behind every calculation so readers can repeat it
  • Labels illustrative examples as illustrative rather than as measured data

How Isabelle Builds a Calculation

Every calculation lists the inputs it was made from, so the reader can redo it with different numbers.

Illustrative examples are labelled as illustrative; nothing is presented as measured data unless it comes from a published source.

No claim is made about aggregated player data or internal testing, because she has access to neither.

Guides state explicitly where a method stops working, rather than leaving the limit for the reader to discover.

"Expected cost is turnover multiplied by edge. Everything else in this subject is a story told around that one line." — Isabelle Grant

Frequently Asked Questions

Has Isabelle Grant run the simulations she writes about?

No, and one of her guides explains why none was needed: a large simulation converges on the house edge the game already publishes.

Does she work for a casino operator?

No. She writes for this site and has no access to operator or player data.

Are the figures in her tables real?

The arithmetic is exact and the inputs are stated. Where thresholds or rates vary by operator, the example is labelled illustrative.

Does bankroll management improve results?

No, and her guides say so directly. It changes how long the money lasts and how deep a losing run can go, not the expected cost.

What single number does she recommend tracking?

Total deposited minus total withdrawn, monthly. It is the only measure that selective memory cannot improve.

Articles by Isabelle Grant

4
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