Complete matched betting calculator: qualifying bet + free bet extraction. Calculate both steps and see your total guaranteed profit.
Step 1 (Qualifying bet): Place a bet with the bookmaker and lay the same outcome on an exchange. You'll lose a small amount (the qualifying loss), but this unlocks the free bet.
Step 2 (Free bet): Use the free bet at higher odds (5.0+) and lay again. Since the free bet stake isn't returned, you keep the difference as guaranteed profit.
The net profit = free bet profit − qualifying loss. For a typical "Bet £10 Get £30" offer, expect to net around £20-24 profit.