Working out what a betting slip is worth used to mean pencil, paper and a fair bit of mental arithmetic. Our free bet calculator at BetIdeas does the same job in seconds, turning any combination of odds and stakes into a clear payout figure.
From a no-frills single to a sprawling Goliath, the tool will reveal what each wager pays out before you commit a penny. Punch in your numbers, set your conditions, and let the maths take care of itself.
In essence, our bet calculator is a mathematical engine that translates odds and stakes into a finished payout figure. It strips out the manual arithmetic that used to trip up bettors and replaces it with a clean, repeatable output you can trust.
Behind the simple interface sits logic that understands win conditions, place fractions, dead heat splits and Rule 4 reductions. None of those layers are exposed to you – they’re applied automatically once you press calculate.
The result is a tool that bridges raw bookmaker prices and the actual return sitting in your account if the slip lands. For free bet promotions, where the stake itself isn’t yours to keep, that distinction matters more than ever.
The betting calculator factors in all the following without any extra input from you:
A six-fold acca with mixed fractional and decimal prices is the sort of slip that invites slip-ups. Run it through the calculator and the figure that appears will be the figure you’d actually collect from the bookmaker.
Bookmaker prices on their own don’t tell you much – 11/4 means little without context, and a six-leg accumulator at varied prices is even harder to picture. The calculator converts those raw odds into a concrete return figure the moment you finish entering them.
The calculator scales from a desk-bound monitor down to a phone screen at the racecourse without losing any functionality. Bookmark it once and you’ve got the same tool wherever a decision needs to be made.
Paid calculator apps live in app stores promising features that our browser-based betting calculator already includes at no cost. Unlimited use, no sign-ups, no nagging upgrade prompts – it sits there ready whenever a slip needs checking.
Bookmakers around the world don’t agree on how to display prices, which is why three competing formats still survive side by side. Our free bet calculator accepts all three and converts internally, so you can paste in whichever style your sportsbook happens to use.
The decimal format expresses the total return per unit staked, including your original wager wrapped inside the figure. A price of 4.50 on a £10 free bet would point to £45 coming back if the selection wins, though only £35 of that is profit.
This style dominates exchanges and most European-facing platforms because multiplying numbers like 1.85, 2.20 and 3.10 across an accumulator is trivially easy.
The drawback is that the relationship to historical fractional pricing isn’t always intuitive at a glance.
British high-street bookmakers still lean heavily on fractions such as 7/2, 9/4 or 100/30. The figure on the left is the profit you’ll receive for staking the figure on the right, with your original outlay returned on top if the bet wins.
So 7/2 on a tenner pays £35 in profit plus the £10 stake back, landing £45 in your account. Some punters find this style more transparent because the profit portion is stated explicitly rather than buried inside a multiplier.
American sportsbooks display prices around a $100 reference point, with a plus or minus sign in front. A line of +180 means $180 profit on a $100 winning stake, while -150 means you’d risk $150 to win $100 back.
The format takes a few minutes to get used to, but it’s everywhere across NFL, NBA, NHL and MLB markets. Our calculator handles the conversion behind the scenes so the equivalent decimal or fractional figure is always there for comparison.
The table below shows the same set of prices written out in all three formats, alongside the return a £10 stake would generate. Use it as a quick reference when switching between bookmakers that display odds differently.
| Fractional | Decimal | American | £10 Stake Returns | Implied Probability |
|---|---|---|---|---|
| 1/4 | 1.25 | -400 | £12.50 | 80.0% |
| 1/2 | 1.50 | -200 | £15.00 | 66.7% |
| Evens (1/1) | 2.00 | +100 | £20.00 | 50.0% |
| 6/4 | 2.50 | +150 | £25.00 | 40.0% |
| 2/1 | 3.00 | +200 | £30.00 | 33.3% |
| 7/2 | 4.50 | +350 | £45.00 | 22.2% |
| 5/1 | 6.00 | +500 | £60.00 | 16.7% |
| 10/1 | 11.00 | +1000 | £110.00 | 9.1% |
| 20/1 | 21.00 | +2000 | £210.00 | 4.8% |
Notice how a single price like Evens flips between formats – 1/1 fractionally, 2.00 decimally and +100 in American notation – while all three describe the same payout. The implied probability column on the right is a bonus reference for spotting where bookmakers may have priced a market too generously.
UK punters enjoy one of the most varied bet menus on the planet, much of it inherited from a century of horse racing tradition. Our calculator covers every option below, from beginner-friendly singles to systems with dozens of moving parts.
The simplest bet on the board involves one selection that either wins or loses outright. A successful £20 single at 9/4 returns £65 in total, of which £45 is the actual profit.
Each-way splits the stake into two equal halves – one on the winner, one on the placed finishers. Place terms vary by race and field size, so the calculator lets you select the right fraction (typically 1/4 or 1/5) to match your bookmaker’s terms.
A double rolls two selections into one slip, with both required to win for any return. Trebles do the same with three picks, and the calculator multiplies the odds chain automatically rather than asking you to compound prices manually.
Stack four or more legs together and you’ve built an accumulator, where the potential return can multiply spectacularly but a single losing leg wipes the slip out. Our acca section accepts up to twenty selections, which covers even the most ambitious weekend football coupons.
Full-cover bets generate every possible combination of multiples from a fixed set of selections. The most common varieties include:
Calculating these by hand is genuinely painful, so the tool earns its keep most clearly with this family of wagers.
Each bet type has its own dedicated page, so a Lucky 31 needs the Lucky 31 calculator rather than the singles version. Selecting the correct one ensures all the right input fields appear from the outset.
Choose fractional, decimal or American before entering anything else, as the input boxes change shape depending on the format you’ve picked. Mixing formats mid-entry is the most common source of incorrect figures.
Enter the cash amount you’ve placed, or plan to place, in the stake field. If you’re sizing up a wager that hasn’t been struck yet, a stake of £1 will tell you the return-per-pound multiplier instantly.
Drop the price for each selection into its corresponding box, taking care to enter Starting Prices if that’s what you took at the time of the bet. Already-settled bets need the exact prices that the bookmaker locked in on your slip.
For each leg, mark whether it won, placed, lost, was voided, or finished in a dead heat. The calculator weighs these statuses correctly rather than treating everything as a flat win or loss.
The total stake, total return and net profit all appear together at the bottom of the page. You can rerun the calculation as many times as you like by tweaking one variable at a time.
The table below summarises every calculator on offer and the type of slip each one is built for. If you’re not sure which option to choose, this rundown will point you to the right page.
| Calculator | Built For |
|---|---|
| Single | One selection on a win-only basis |
| Each Way | One selection split between win and place |
| Double | Two selections combined into one wager |
| Treble | Three selections combined into one wager |
| Accumulator | Four or more selections rolled together |
| Trixie | 4 bets across 3 selections (3 doubles + 1 treble) |
| Patent | 7 bets across 3 selections (Trixie plus 3 singles) |
| Yankee | 11 bets across 4 selections |
| Canadian | 26 bets across 5 selections (also called a Super Yankee) |
| Super Yankee | 26 bets across 5 selections, no singles included |
| Heinz | 57 bets across 6 selections |
| Super Heinz | 120 bets across 7 selections |
| Goliath | 247 bets across 8 selections |
| Lucky 15 | 15 bets across 4 selections, with singles included |
| Lucky 31 | 31 bets across 5 selections, with singles included |
| Lucky 63 | 63 bets across 6 selections, with singles included |
| Alphabet | 26 bets across 6 selections, mixing patents and a six-fold |
| Single Stakes About | 2 conditional bets across 2 selections |
| Double Stakes About | 2 conditional bets across 2 selections at double stakes |
| Round Robin | 10 bets across 3 selections, including Single Stakes About pairs |
| Flag | 23 bets across 4 selections, combining a Yankee with Single Stakes About pairs |
| Super Flag | 46 bets across 5 selections |
| Union Jack Trebles | 8 trebles across 9 selections arranged in a 3×3 grid |
| Union Jack Trixie | 8 Trixies across 9 selections in a 3×3 grid |
| Union Jack Patent | 8 Patents across 9 selections in a 3×3 grid |
| Union Jack Round Robin | 8 Round Robins across 9 selections in a 3×3 grid |
| Rule 4 | Adjusts horse racing returns when a runner withdraws |