CalculatorsUpdated 22 Jul 20262 min read
Lay Betting Calculator
Two questions, one tool: what a lay actually risks, and what stake evens out a bet you have already placed.
Held by the exchange until the market settles. Commission never reduces this.
The backer's stake, less 2% commission on the win.
This lay only makes money if the selection wins less than 24.6% of the time. Laying is not the safe side of a bet — it is a bet that something will not happen, at a price.
Liability is the number that matters#
The headline on a lay is the stake you collect; the number that decides whether you can afford it is the liability. Laying 20 at 6.00 risks 100 to win 20 — a bet you will win 80% of the time and still lose money on if your price is wrong.
This is why lay betting is not the cautious side of the market. It is the same wager seen from the other end, with the break-even probability flipped. A lay is only worth taking when you rate the selection's real chance below what the price implies, which is the value test run backwards.
Green-up, honestly#
The second mode answers the back-to-lay question: you backed at one price, the market moved, and you want the result to stop mattering. The stake it gives you locks the same profit either way.
What it cannot do is manufacture value that has gone. If the price has drifted since you backed it, evening the position costs you — the calculator shows that as a locked loss rather than hiding it. And when the price has shortened, taking the certain profit means selling the rest of your edge back to the market. That is a reasonable way to cut variance; it is not free money.
The same logic in bookmaker form is cash out, where the margin is buried in the offer instead of shown, and in the hedging calculator.
Where this fits#
Full method and worked examples in the lay betting guide. If you are laying to close a position rather than to express an opinion, closing line value is the metric that tells you whether the original bet was any good — independently of what you did with it afterwards.
Related
- Lay Betting: Taking the Other Side
- Cash Out: What the Bookmaker Is Actually Offering You
- Arbitrage Betting: Real, Legal, and Mostly Not Worth It
- Fair Odds: What the Bookmaker's Margin Hides
- Closing Line Value: The Only Scoreboard That Answers in a Season
- Hedge Calculator: Lock In a Result and Price a Cash-Out
- Fair Odds Calculator — Remove the Bookmaker Margin from Any 1X2 Book
- Odds Converter — Decimal, Fractional, American & Implied Probability
- Closing Line Value Calculator — Grade a Bet Without Waiting for the Result
Frequently asked questions
How do you calculate lay liability?
Liability = lay stake × (lay odds − 1). Laying 50 at 4.00 risks 150. Commission never reduces liability — it is charged on winnings only, so it lowers what you keep when the lay wins and changes nothing when it loses.
How do you calculate the lay stake to green up?
With a back stake A at odds B, laying at odds L with commission rate c, the equalising lay stake is (A × B) ÷ (L − c). That leaves the same profit whether the selection wins or loses.
Does commission apply to liability?
No. Exchanges charge commission on net winnings, so it applies to the stake you collect when a lay wins and never to the liability you post. Comparing gross numbers makes laying look better than it is.
Is laying safer than backing?
No. Laying a 6.00 shot for 20 risks 100 to win 20 — you win small and often, and lose large and rarely. The risk is the same bet viewed from the other side, and short-priced favourites are where lay liability gets dangerous.