Lucky 15 Calculator — System Bet Returns for 4 Selections

The Lucky 15 calculator lets you instantly work out your returns from any 4-selection system bet. Enter three pieces of information: your unit stake (the cost per individual bet line), the decimal odds for each of your four selections, and which selections won using the checkboxes. Click "Calculate Lucky 15" and the tool shows your total return, profit or loss, and a full breakdown by bet type.

The unit stake is the amount placed on each of the 15 individual bets. Your total outlay is therefore 15 × unit stake. For example, a £1 unit stake costs you £15 in total. A £5 unit stake costs £75. This is an important distinction — many bettors confuse unit stake with total stake when placing Lucky 15 bets at the bookmaker.

Use decimal odds format (e.g. 3.50 rather than 5/2 or +250). Most online bookmakers display decimal odds by default. To convert fractional odds to decimal, divide the numerator by the denominator and add 1: 5/2 becomes (5÷2)+1 = 3.50.

A Lucky 15 is a full coverage system bet on 4 selections comprising exactly 15 bets:

• 4 singles — each selection individually (C(4,1) = 4)
• 6 doubles — every possible pair from the 4 selections (C(4,2) = 6)
• 4 trebles — every possible group of 3 (C(4,3) = 4)
• 1 four-fold accumulator — all 4 selections combined (C(4,4) = 1)

Total: 4 + 6 + 4 + 1 = 15 bets.

For each individual bet combination:

1. Check if all selections in the combination won. If any selection in a combination lost, that combination returns £0.
2. Calculate the return: Return = unit_stake × (odds of selection 1) × (odds of selection 2) × … for every winning selection in the combination.
3. Sum all returns from every winning combination to get the total return.
4. Profit = total return − total stake (where total stake = 15 × unit stake).

The "full coverage" aspect of a Lucky 15 means you get consolation returns even when not all selections win. With just 1 winner you still collect the single. With 2 winners you collect 2 singles and 1 double. With 3 winners you collect 3 singles, 3 doubles, and 1 treble — a meaningful return even without hitting all four.

Example 1 — All Four Win at 3.0 Each

Unit stake: £1. All four selections win at odds of 3.0 each.

• 4 singles: 4 × £1 × 3.0 = £12
• 6 doubles: 6 × £1 × (3.0 × 3.0) = 6 × £9 = £54
• 4 trebles: 4 × £1 × (3.0 × 3.0 × 3.0) = 4 × £27 = £108
• 1 four-fold: 1 × £1 × (3.0 × 3.0 × 3.0 × 3.0) = £81
• Total return: £255; total stake: £15; profit: £240

Example 2 — Two Winners at 4.0 and 5.0

Unit stake: £1. Selections A (4.0) and B (5.0) win; selections C and D lose.

• Singles: £4 (A) + £5 (B) = £9
• Double A+B: £1 × 4.0 × 5.0 = £20
• All other doubles, trebles and four-fold include C or D → £0 each
• Total return: £29; total stake: £15; profit: +£14

Two winners at decent odds turns a £15 Lucky 15 into a profitable bet even without hitting the four-fold. This is the key advantage over a straight accumulator.

Example 3 — One Winner at 20.0 (Big Priced Single)

Unit stake: £1. Only selection D wins at 20.0 odds.

• 1 winning single: £1 × 20.0 = £20
• All combinations involving other selections → £0
• Total return: £20; total stake: £15; profit: +£5

Even a single big-priced winner can return a profit on a Lucky 15 because the singles provide insurance. An accumulator with the same bet would return £0.

Lucky 15 vs. Accumulator — Why Bother?

A 4-fold accumulator on the same selections with a £15 stake only returns money if all four win. A Lucky 15 at £1 per line covers the same event but pays out on 1, 2, 3, or 4 winners. The tradeoff is cost: to get the same four-fold return as a £15 acca, your Lucky 15 needs only a £1 unit stake — but your total outlay is identical at £15. The real benefit is the consolation structure: singles and doubles pay when the acca would return nothing.

Lucky 31 and Lucky 63

The Lucky 15 is part of a family of full-coverage system bets. A Lucky 31 covers 5 selections (5 singles + 10 doubles + 10 trebles + 5 four-folds + 1 five-fold = 31 bets). A Lucky 63 covers 6 selections and produces 63 bets (6 singles + 15 doubles + 20 trebles + 15 four-folds + 6 five-folds + 1 six-fold). Each step up in selections dramatically increases both the total cost and the potential return from a full set of winners. For 5 selections at 3.0 each with a £1 unit stake, a Lucky 31 full win returns £993. For 6 selections, a Lucky 63 full win at 3.0 each returns £3,276. These bets are popular in horse racing and golf tournaments where bettors want full coverage across several fancied runners.

Many bookmakers offer a consolation bonus for Lucky 15, 31, and 63 bets — often doubling the odds if only one selection wins, or paying a small bonus if all four win. Check your bookmaker's terms; the calculator uses standard returns without bonus multipliers.