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Front Runner Trading EV Calculator

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This calculator is designed for front-runner back-to-lay trades. Enter your back odds, target lay odds, stake, how often you expect your lay to be hit in-running, and how often the horse wins overall. The tool will show you the expected value (EV) of the trade.

Assumption: This calculator assumes you always lay for a full green-up when your target lay price is hit. That means you lock the same profit whether the horse goes on to win or lose after the lay is matched.

How this front-runner EV model works

A typical front-runner trade for us looks like this: back a likely leader at big odds before the off, then set a keep lay bet at much shorter odds in-running. If the horse gets to the front, the price usually collapses, your lay is matched, and you can green up for a low-risk profit.

This calculator shows you whether that idea is mathematically worth repeating. It does this by combining:

Honest John's trading logic

We assume four things:

  • • When your lay is matched, you fully green up – same profit whether it later wins or loses.
  • • If the lay is not matched, you're simply left holding your original back bet.
  • • Your hit-rate estimate (“lay gets matched”) is realistic over a large sample of similar trades.
  • • Your win-chance estimate is your honest read of how often this type of horse actually wins.

Advanced Betting Tools

More Honest John calculators for serious punters:

Dutching for Stake → Dutching for Profit → Value-Weighted Dutching →

Disclaimer: This calculator is provided for educational and entertainment purposes only. While every effort has been made to ensure accuracy, Honest John Tipster makes no guarantees of any kind regarding calculated results or betting outcomes. Always gamble responsibly and verify your own figures before placing any bets, especially with in-running trading.