Rule 4 Betting Calculator – How Does It Work?

[Oddsmart Admin]

Oddsmart’s Rule 4 Betting Calculator adjusts your horse-racing odds whenever a runner is withdrawn, so you always know your true potential return.

What Is a Rule 4 Deduction?
When a non-runner is declared after final declarations, bookmakers apply a pence-in-the-pound reduction to the remaining odds.

This compensates for the smaller field and shifts probabilities accordingly.

Why Use the Calculator?

Accurate Returns: Avoid overestimating your winnings by automatically applying the correct deduction.

Time-Saving: Instantly compute adjusted odds without manual formulas.

Matched Betting Ready: Get new back and lay odds to hedge correctly on the exchanges.

How It Works

Enter Original Odds: Input the decimal odds you backed (e.g. 6.0).

Select Deduction Rate: Choose the Rule 4 percentage (5p–90p) based on the withdrawn horse’s odds.

(Optional) Enter Lay Odds: If you’ve already laid on an exchange, input the original lay odds to see their adjusted value.

View Adjusted Odds:

The tool applies

New Odds = (Old Odds – 1) × (1 – Deduction) + 1

so 6.0 at a 45 p deduction becomes (6 – 1)×0.55+1 = 3.75

When to Use
Always run your race bets through the Rule 4 Calculator before settling your lay stakes or evaluating profits—especially if you’re matched betting or qualifying for free bets.

It ensures your laid stakes and expected returns reflect real-world deductions, protecting your margins every time.

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