Betfair Dutching Calculator: How to Use It Properly

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This is a sub of our pillar on Betfair trading tools and calculators, and it sits alongside our guides to the lay betting calculator and the matched betting calculator. Dutching is the simplest of the staking calculations to grasp and the easiest to get quietly wrong, so it's worth doing once, slowly, with real numbers.

What dutching actually is

Dutching means backing several runners in the same event so that you collect the same net profit no matter which of your selections wins. Instead of putting £50 on one horse and praying, you might split that £50 across three you fancy, sized so each one returns, say, £8 profit if it wins. You've widened your chance of a return at the cost of a smaller return — you're trading hit-rate for payout. It's named, the story goes, after Al Capone's accountant “Dutchy” Schultz, and the principle is identical to dutching as a trading strategy: convert several selections into one synthetic bet with a known, level outcome.

On the Betfair Exchange dutching is cleaner than at a bookmaker because the back prices are usually better and you're not fighting an inflated overround on every runner. But the exchange also takes commission on winnings, and that's the variable most calculators ignore unless you tell them to.

What a dutching calculator does

The calculator answers one question: given these odds and this total stake, how much do I put on each selection so the profit is equal whichever wins? Doing it by hand for two runners is easy; for four or five it's fiddly and error-prone, which is exactly why the tool exists. You feed it the back odds for each selection and either your total stake or your desired profit, and it returns the individual stakes and the resulting profit. Good ones — including the dutching mode in our own trading calculator — also let you input a commission rate so the profit figure is the real, post-commission number rather than a flattering gross.

How to use a dutching calculator, step by step

1. Pick your selections. Decide which runners you're backing in the one market — typically two to four. More than that and the maths leaves you with a tiny profit margin that commission can wipe out.
2. Take the real back odds. Read the available to back price on the ladder or grid, not last traded, not the bookmaker price. Liquidity matters: if there's only £12 available at 6.0, you can't get £40 on at 6.0.
3. Enter your total stake or target profit. Decide whether you're working from “I want to risk £50 total” or “I want £10 profit whichever wins”, and enter that.
4. Set the commission rate. Put your actual rate in (commonly 2%–5% depending on market and discount rate). This is the step most people skip.
5. Place each stake at the shown price. The calculator gives you a stake per selection — place each as a back bet at the price you read. Get them matched before the market moves.
6. Confirm matched. If one leg doesn't match, your level profit is broken; either chase the fill at the same price or rebalance with the calculator using the price you actually got.

The formula behind it (so you can sense-check)

You don't need the maths to use the tool, but knowing it stops you trusting a wrong answer. For each selection the stake is your total stake multiplied by (1 / that selection's odds) divided by the sum of (1 / odds) across all selections. The sum of the reciprocals of the odds is the combined implied probability of your selections — and it has to be below 1.0 (100%) for dutching to be possible at a profit. If your selections' implied probabilities add up to more than 100%, you're locking in a guaranteed loss before commission, and a good calculator will warn you. That single check — do the implied probabilities sum to under 100%? — is the sanity test for whether a dutch is worth placing at all.

The commission trap nobody mentions

Here's the bit that catches people: most generic dutching calculators show you gross profit, and on the exchange you pay commission on net market winnings. On a healthy dutch like the example above, commission is a small slice and you're clearly ahead. But on a tight dutch — say three short-priced favourites where your implied probabilities sum to 0.95 — your gross edge might be only a percent or two, and 5% commission on the win can flip the whole thing negative. Always enter your real commission rate, and if you trade enough to have earned a discount rate, use that number. The difference between a 5% and a 2% assumption is the difference between a profitable dutch and a losing one on the margins.

When dutching makes sense — and when it doesn't

Dutching earns its keep when you have a genuine opinion that several runners are collectively underpriced — you think the true chance of one of your three winning is higher than the 41.6% the market implies. It's also useful for reducing variance when you'd rather hit small and often than swing big, and for trading in-running where you want to cover a couple of outcomes. It does not make sense as a way to “feel safer” by backing more runners — every extra selection lowers your payout and adds another price that has to be value. Dutching is a tool for expressing a multi-runner opinion efficiently, not a magic trick that turns guessing into profit. If you don't have an edge on the selections, dutching just spreads the same losing bet across more horses.

Common dutching mistakes

The recurring errors are predictable. Using bookmaker or last-traded odds instead of the real available-to-back price, so the stakes are calculated for prices you can't actually get. Ignoring liquidity — the calculator assumes you can place the full stake at the shown price, but if the money isn't there your dutch is unbalanced the moment one leg part-fills. Forgetting commission and celebrating a gross profit that's smaller net. Dutching too many runners until the margin is so thin that any slippage or commission eats it. And not rebalancing when one leg matches at a worse price than planned — if you got 7.6 instead of 8.0 on a leg, your profit is no longer level until you adjust. Each of these is avoidable by reading the market properly and re-running the calculator with the prices you actually achieved.

Calculators and tools to use

You don't need to pay for a dutching calculator. Our free trading calculator includes a dutching mode with a commission field, and the dedicated trading software — Bet Angel and others reviewed in our software rankings — has dutching built into the one-click interface, sizing and placing all legs together so you don't get caught by a partial fill. For the full landscape of free tools, the best free Betfair tools list is the place to start. If you dutch regularly, integrated software is worth it purely for placing all legs simultaneously; for occasional use, a calculator plus careful manual placement is fine.

The verdict

A dutching calculator is a five-minute skill that removes all the arithmetic from a genuinely useful technique — but it's only ever as good as the three things you feed it: real back prices you can actually get, your true commission rate, and selections you have an honest edge on. Master those and dutching becomes a clean way to back a multi-runner opinion for level profit. Skip them and the tidy on-screen number is a fiction. Start with the calculator, sense-check with the implied-probability rule, and never let the gross figure fool you into ignoring commission.

Dutching versus backing one selection

The fundamental trade-off in dutching is hit-rate for payout, and it's worth making explicit because beginners often dutch for comfort rather than for a reason. Back one selection at 5.0 with £30 and you win £120 one time in five (at fair odds); dutch three selections whose chances sum to the same total and you win a smaller amount more often. Neither is “safer” in expectation — if every price is fair, both have the same expected value, and dutching simply reshapes the distribution of outcomes into smaller, more frequent wins. That reshaping is genuinely useful when you value lower variance (you'd rather a steadier equity curve than occasional big hits), or when you genuinely believe several runners are collectively underpriced. It is not useful as a psychological crutch to feel like you're “covering yourself”, because every extra selection you add has to be value in its own right — adding a no-hope runner to a dutch just bleeds expected value for the illusion of safety. Before you dutch, ask honestly: am I doing this because I have a multi-runner opinion, or because backing one runner feels too scary? Only the first reason justifies it.

Liquidity and the order in which you place legs

A subtlety the calculator can't capture is that a dutch is only level if every leg actually matches at the price you planned, and on the exchange that's not guaranteed. If you're dutching runners at a range of prices, place the longest-priced, thinnest legs first, because those are the ones most likely to move or run out of money — the short-priced favourite with thousands available will still be there in ten seconds, but the 11.0 outsider with £40 showing might not. If a leg part-fills, your profit is no longer level and you must re-run the calculator using the stakes and prices you actually achieved, then adjust the remaining legs. This is exactly why dedicated trading software is worth it for anyone dutching regularly: tools like Bet Angel place all legs simultaneously at the press of a button, so you never end up with two legs matched and one hanging while the market moves. For manual dutching with a calculator, work fast, watch the available money, and accept that occasionally a leg won't fill and you'll need to rebalance on the fly.

Dutching in-running and dutching to lay

The same calculation works in two situations beginners rarely think of. In-running dutching lets you cover two or three outcomes once a match or race is underway — useful when, say, two horses have pulled clear and you want a return whichever of them wins. The catch is the same as any in-play trade: prices move fast, the in-play delay bites, and a leg that doesn't fill breaks your level profit, so it suits liquid markets and fast tools only. Dutching to lay flips the logic — instead of backing several runners to win, you lay several to lose for an equal profit if none of them wins, which is really a multi-selection version of laying and carries the combined liability of every leg. A good calculator handles both modes; the discipline is identical — real available prices, your true commission rate, and an honest view that your selections are mispriced. Don't let the novelty of in-running or lay dutching tempt you into trades where you've no actual edge; the calculator makes the maths easy but it can't supply the opinion.

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Related reading

Compare dutching with the lay betting calculator and the matched betting calculator, read the full trading tools pillar, and see dutching used as a live tactic in our dutching strategy guide. The free tools list rounds up everything else worth installing.