Lucky 15 calculator
4 selections, 15 bets — singles, doubles, trebles, and one four-fold. Flip each selection's status to won or lost, set the bookmaker bonus terms, and see your total return.
Total outlay = 15 × this. £1 unit = £15 total.
How the Lucky 15 maths works
Take four selections — call them A, B, C, D — at decimal odds oA, oB, oC, oD. With unit stake s, your 15 bets are:
- 4 singles: each pays
o × sif that horse wins. - 6 doubles: pairs (AB, AC, AD, BC, BD, CD). Each pays
o₁ × o₂ × sif both win. - 4 trebles: triples (ABC, ABD, ACD, BCD). Each pays
o₁ × o₂ × o₃ × sif all three win. - 1 four-fold:
o_A × o_B × o_C × o_D × sif all four win.
Bonus rules.If exactly one selection wins, the single is multiplied by 3 (triple odds). If all four win, the total return is boosted by 10-25% depending on bookmaker. Both bonuses default to ON in the calculator — uncheck them if your bookmaker doesn't offer that variant.
Worked example. £1 Lucky 15 (£15 total stake), three winners at 3.5, 4.0 and 2.5 (selection 2 loses). Singles: 3.5 + 4.0 + 2.5 = £10.00. Doubles: 14 + 8.75 + 10 = £32.75. Trebles: only ACD triple wins = 3.5 × 4.0 × 2.5 = £35.00. Four-fold loses. Total: £77.75. Profit £62.75.
FAQ
- What is a Lucky 15?
- A Lucky 15 is a full-cover bet on 4 selections — 15 individual bets covering every possible singles, doubles, trebles and accumulator combination. The bets are: 4 singles, 6 doubles, 4 trebles, and 1 four-fold accumulator. You need just one winner for a return; the more winners, the bigger the payout, especially once the bookmaker bonuses kick in.
- How much does a Lucky 15 cost?
- Your total stake is 15 × your unit stake. So a £1 Lucky 15 costs £15, a £2 Lucky 15 costs £30, a 50p Lucky 15 costs £7.50. The unit stake input on the calculator is the per-bet stake, not the total outlay.
- What are the Lucky 15 bonuses?
- Most UK bookmakers offer two standard bonuses on a Lucky 15. (1) Single-winner bonus: if only one of your four selections wins, the single is paid at triple the quoted odds. (2) All-winners bonus: if all four selections win, your total return is boosted by 10% (some bookmakers go to 20%). Smaller variants like 'double odds + 25% all winners' also exist — toggle the rate on the calculator to model your bookmaker's exact terms.
- Is a Lucky 15 better than 4 singles?
- Mathematically a Lucky 15 has higher variance — you spend more (£15 vs £4 at £1 unit) and your downside is bigger if everything loses, but your upside is much bigger if multiple selections win. As a rule of thumb: if you genuinely fancy four horses across a day, the Lucky 15 squeezes more from multiple winners than four flat singles would. If you only fancy one or two, stick to singles.
- What's the difference between Lucky 15, Yankee and Patent?
- All are 4-selection bets — they differ by which combinations are included. Lucky 15 = 4 singles + 6 doubles + 4 trebles + 1 four-fold = 15 bets. Yankee = 6 doubles + 4 trebles + 1 four-fold = 11 bets (no singles, so you need at least two winners for any return). Patent = 3-selection version with singles + doubles + treble = 7 bets. Trixie = 3-selection Yankee equivalent (doubles + treble = 4 bets, no singles).
More tools. Each-way · Accumulator · Rule 4 · Dutching