Free Lucky 15 calculator
4 selections, 15 bets — 4 singles + 6 doubles + 4 trebles + 1 fourfold. The UK retail favourite, complete with standard bookmaker bonus structures.
4 selections, 15 bets — 4 singles + 6 doubles + 4 trebles + 1 fourfold. The UK retail favourite, complete with standard bookmaker bonus structures.
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A Lucky 15 is the four-selection workhorse of UK betting. You pick four selections — A, B, C and D — and the bookmaker writes 15 bets: 4 singles, 6 doubles, 4 trebles, and 1 fourfold accumulator. A £1 Lucky 15 costs £15 total. It is functionally a Yankee with singles added — and the singles unlock the bookmaker bonus structure that pure Yankees don't get.
Two bookmaker bonuses are virtually standard on Lucky 15s: a single-winner bonus (typically 2x, 3x or 4x the odds on the one winning selection if only one of your 4 lands) and an all-winners bonus (typically a 10–25% uplift on total return if all 4 win). Bookmakers compete on these terms — pay attention.
Four selections, all priced 5/2 (3.50 decimal), £0.50 unit stake — total outlay £7.50. Settling each component:
Total return = £204.53 on £7.50 outlay — a profit of £197 before bonuses. Add a typical 10% all-winners bonus and the total return becomes £225.00 for a profit of £217.50, about 29× the stake. The bonus alone adds £20 to the result — the structural reason Lucky 15 is the UK retail favourite.
And if only one wins at 5/2? You collect the single (£1.75) plus the typical 2x odds bonus (extra £1.75) = £3.50 return on £7.50 outlay. Net loss £4.00 — a much gentler landing than the £15 wipeout an accumulator would book.
The three closest relatives, with their key differences:
| Bet type | Selections | Bets | Singles? | Bonuses? |
|---|---|---|---|---|
| Yankee | 4 | 11 | No | No |
| Lucky 15 | 4 | 15 | Yes (4) | Standard |
| Lucky 31 | 5 | 31 | Yes (5) | Standard |
Lucky 15 is the sweet spot of the family: enough selections to multiply meaningfully, enough singles to cushion a shocker, bonus terms baked in. Lucky 31 extends it to 5 selections but the unit-stake price climbs sharply (31 bets vs 15).
Bonus payouts make a Lucky 15 feel like the bookmaker is doing you a favour, but 15 separate bets means 15 layered slices of margin. Even with a 10% all-winners bonus, a typical 4-leg Lucky 15 on UK racing favourites is still a negative-expectation wager. The bonus narrows the gap; it doesn't close it. The implied-probability gap that turns the slip against you is the cornerstone read that works the maths from first principles — essential before you stack into multi- leg full-cover bets.