Lay Value Calculator

Course

Racecourse — type to search, auto-fills win rate & threshold

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Fav win %

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Lay win %

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Rec. threshold

Form Analysis LOCAL · NO API

Favourite — Paste Card (Sporting Life / Timeform)

Favourite Lay Odds (auto-fills Race Inputs)

Jockey & Trainer

Jockey name

Trainer name

Jockey5

Solid professional, no strong signals

Trainer5

Average yard, no strong signals

2nd Favourite — Paste Card (optional)

2nd Favourite Odds

Jockey & Trainer

Jockey name

Trainer name

Jockey5

Solid professional, no strong signals

Trainer5

Average yard, no strong signals

3rd Favourite — Paste Card (optional)

3rd Favourite Odds

Jockey & Trainer

Jockey name

Trainer name

Jockey5

Solid professional, no strong signals

Trainer5

Average yard, no strong signals

Form Assessment

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Suggested true win %

Lay strength—

Race Dynamic

1st Fav

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True win %

2nd Fav

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True win %

3rd Fav

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True win %

Race Inputs

Lay Odds (decimal)

Your True Win % Estimate (or use form analysis above)

Track Favourite Win Rate (historical %)

Number of Runners

Edge Needed to Bet 15%

Lay Edge

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Market Implied Win

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Your True Win %

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Lay Odds

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Filter Checklist

Formula Reference

Market Implied % = 100 ÷ Lay Odds
Lay Edge % = 100 − (True Win % × Lay Odds)
Effective Threshold = Base + Field Adjustment
Lay is value if Edge ≥ Effective Threshold

Field adjustment: −4% for 17+, −2% for 14–16, 0% for 11–13, +2% for 9–10, +5% for 7–8, +8% for 5–6, +12% for ≤4.

Racecard Analyser PASTE FROM ATTHERACES.COM

Paste full day's racecard text (copy all text from attheraces.com racecard page)

Ratings Database

Google Sheets URL (paste from Settings guide)

Add / Update Jockey

Name

Rating

Add / Update Trainer

Name

Rating