Sequential Lay Calculator

Mode

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Back Stake (£)

Back Odds

Comm (%)

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OFF = global · ON = per-leg

Outcomes

How to Sequential Lay

Sequential laying is a calculation method we use when we need to lay outcomes that finish after each other.

Some examples of outcomes you can sequential lay:

Fact To File (15:30) & Arsenal To Win (16:30)
Respond (13:30 Chester) & Galiyan (14:05 Chester) both to win
Arsenal (12:30), Chelsea (15:00) & Man City (17:30) to win

Since each outcome finishes before the next one starts, we can use a sequential lay calculator to work out how much to lay on each one.

Example

Take a profitable boost on two horses to win: Respond (13:30 Chester) & Galiyan (14:05 Chester) both to win, boosted from 7.00 to 8.00. First, make sure the events don't overlap. Then head to Smarkets and find the current lay odds for each horse to win their race.

The current lay odds for Respond to win are 2.84, and for Galiyan they are 2.66. Enter the outcomes in the order they finish, earliest first - the calculator relies on this order to work out the correct lay stakes.

£10 back stake at 8.00 boosted odds, two legs

Only lay each outcome after the previous leg has won. Wait for Respond to win before laying Galiyan. If Respond loses, there's no need to lay Galiyan - the boost is already lost.

The breakdown section then shows the potential profit if all legs win.

Modes

You can switch the mode at the top to Lock In, which increases the lay stake on the final leg so you profit no matter what happens. Like standard laying, this is less profitable long term.

Advanced

The Free Bet (SNR) toggle is for when the back bet is a stake-not-returned free bet. Turning on Advanced unlocks a per-leg in-play lock-in toggle that lets you place a second short-odds lay during a match to insure against a late equaliser.

⚠ Risks with sequential laying

Make sure the events don't overlap, even if they kick off at different times. If a football match is still being played when you lay the next leg and that match then loses, you'll lose both the back bet and the lay, resulting in a double loss.
Be cautious when sequential laying legs spread over a long period, as lay odds can move before each leg starts. Man City's lay odds might be 1.56 when you first calculate, but if they announce squad rotation the next day the odds could drift to 1.95, which would ruin the margin and profit for your acca.
Make sure your exchange balance can cover the liability of every leg, not just the first one. If the earlier legs win, you'll need enough funds to lay each following leg at the odds shown in the calculator. Running out of balance mid-acca means you can't place the next lay, leaving you fully exposed if that leg loses.
Long gaps between legs make it easy to forget the next lay. Set a reminder or note before each event so you don't miss one - a missed lay can turn a profitable boost into a loss.