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This tool and any “odds” or outputs are provided strictly for education and entertainment purposes only and must not be used for betting or gambling in any way whatsoever. If you choose to gamble, use only official tools and information provided by licensed betting operators. Read the full disclaimer.

Horse racing simulator for entertainment - not real betting

Toy Bet Simulator & Bankroll “What-If” Calculator

Change the assumptions (odds, chances, staking) and simulate thousands of seasons to see a range of possible outcomes.

Quick presets

How to use it

This is a toy model for exploring risk. It’s not tips, and it can’t predict real races.

A good 30-second setup

1) Pick Win or Each-Way.

2) Enter decimal odds (example: 4.50).

3) Set your win chance and place chance.

4) Choose a staking mode, then click Run simulation.

If you don’t know what to put, click a preset (Conservative / Balanced / Spicy) and then tweak one input at a time.

What do “win chance” and “place chance” mean?

Win chance is the probability your pick wins (0–1).

Place chance is the probability it finishes in the paid places (and includes wins).

Rule of thumb if you’re guessing: start with Place ≈ 2 × Win (cap at 1.00).

Example: Win 0.20 → Place about 0.40.

Win vs Each-Way (simple version)

Win pays only if the horse wins.

Each-Way splits your stake in half: one half for Win, one half for Place.

Each-Way fraction controls the place payout terms (1/5 = 0.20, 1/4 = 0.25).

This tool uses your Place chance input (it doesn’t try to derive it from the number of places).

Staking modes (what they feel like)

Fixed stake: steady bet size; easiest to understand.

% of bankroll: stake rises/falls with your balance (often smoother).

Kelly: sizes stakes based on perceived edge (can swing hard).

If you’re new, try Fixed or small % first. Kelly is for “I know my edge” experiments.

How to read the charts

Histogram: how often each final bankroll happens across simulations.

Curve: the average bankroll after each bet.

Bands (if enabled): a typical “bad season” to “good season” range (10th to 90th percentile).

If the histogram is wide, outcomes are volatile. If ruin is high, stakes are likely too aggressive for the edge.

Inputs

Set assumptions, then simulate. (All probabilities are 0–1.)

Starting bankroll (£)

Your starting balance.

Staking mode

How the stake is calculated each bet.

Fixed stake (£)

Used in Fixed mode.

Stake (% bankroll)

Used in % mode.

Kelly fraction (0–1)

0.5 = half Kelly.

Bet type

Win or Each-Way.

Odds (decimal)

Example: 4.50

Fees / friction (%)

Commission / slippage.

Edge on odds (%)

+ = better price, − = worse.

Win chance (0–1)

Your estimate.

Place chance (0–1)

Includes wins.

Each-Way fraction

1/5=0.20, 1/4=0.25

Places paid

For context only.

Number of bets

Season length.

Simulations

More = smoother.

Target bankroll (£)

0 = off.

Quick sanity checks

• Place chance should be at least win chance (wins are also places).

• Decimal odds must be ≥ 1.01.

• If ruin is high, reduce stake size or shorten the season.

Results

EV, risk, and outcome distributions across many “seasons”.

Implied chance (from odds)

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Rough baseline: 1 / odds.

Expected ROI per bet

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From your inputs.

Expected £ per bet (at start)

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Uses starting stake size.

Chance of ruin

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Runs that hit £0 (if enabled).

Median final bankroll

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Middle outcome.

10th–90th final bankroll

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Typical low-to-high seasons.

Final bankroll distribution

Histogram of where runs finish.

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Average bankroll curve

Mean curve (plus bands if enabled).

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This simulator assumes each bet is independent and uses your chosen win/place chances on every bet. Real life is messier — that’s the point: explore ranges, not certainties.

Global Disclaimer — Educational & Entertainment Only (No Betting Use)

Absolute Prohibition on Betting Use

This tool and any outputs it generates — including (without limitation) any “odds”, implied odds, probabilities, forecasts, tips, recommendations, simulations, rankings, or other information (together, the “Information”) — are provided strictly for educational and entertainment purposes only. You must not use this tool or the Information for betting or gambling in any way whatsoever, including to place, assist with, inform, influence, validate, or support any wager or stake.

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If you choose to gamble, you must rely only on the official tools, prices, rules, markets, and information provided directly by your licensed betting operator(s) and/or their authorised platforms. Do not use this tool as a substitute for any official betting operator tools or information.

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To the maximum extent permitted by applicable law, the tool and Information are provided “as is” and “as available”, without warranties of any kind (express or implied), including warranties of accuracy, completeness, reliability, merchantability, fitness for a particular purpose, non-infringement, or availability.

Assumption of Risk

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