Bet Builder Lay Helper
Work out which market to lay against a football bet builder, then take the maths to the Matched Betting Calculator.
The principle: exchanges won't let you lay the exact bet builder you built at the bookmaker. What you're actually laying is the market whose winning outcomes overlap with your builder's legs, usually Correct Score. Pick your legs below and this checks which scorelines qualify, and whether they narrow down to something you can safely lay.
How this works
A bet builder combines two or more markets from the same match into one price. Exchanges don't offer a matching custom market, so matched bettors lay the closest existing market instead, most often Correct Score. Betfair's Correct Score market lists every scoreline from 0-0 to 3-3 individually, then folds anything bigger into three catch-all bets: Any Other Home Win, Any Other Away Win, and Any Other Draw.
This tool checks your legs against all of those scorelines and both buckets, and tells you which ones actually satisfy every leg you picked. Two legs will often collapse down to a single scoreline. Three or four legs usually leave a small, still layable group. If a catch-all bucket only partly matches your legs (some of the scorelines inside it qualify, others don't), it gets left off the list rather than risking a mismatched hedge.
What this doesn't check
This tool works out the football logic, not what your specific bookmaker allows inside its own bet builder, or whether your exchange even lists a catch-all bucket for that competition. Lower leagues and smaller in-play markets sometimes only offer the explicit scorelines with no Any Other bucket at all, so confirm the market exists and has enough liquidity before you commit.
Once you know which scoreline or scorelines to lay, head to the Matched Betting Calculator to work out the actual lay stake for each one. If more than one scoreline qualifies, splitting the liability evenly across them is the simplest approach.
As with any matched bet, this only identifies the hedge, it doesn't guarantee a profit. Prices move, markets thin out close to kick-off, and correct score liquidity in particular can be poor on smaller fixtures.