Double Bet Calculator
A Double is an accumulator bet that is placed on two selections (e.g. Liverpool and Everton to win). Both results must occur to produce a return on the initial wager. If one leg of the wager fails then all is lost. Double bet odds are the combination of both events with the win from leg 1 being used as the wager for leg 2. The odds will be higher and rewards greater. Alternatively you could place two single bets - this would generate a lower win, but if one leg failed then you'd still get a return provided the other leg was a winner.
Calculate the possible winnings for a Double Bet

Stake £10 For £40 in Bonuses
Betfred
New UK only. Register (excl. 13/04/2024) with promo code WELCOME40, Bet £10+ on Sports in one transaction within 7 days of registering. Get £30 Free Bets & £10 free spins within 10hrs of bet settlement. Bonuses expire 7 days after issue. Min odds, eligibility & payment exclusions apply. Full Terms. 18+. #AD

Double The Odds
Grosvenor Sport
Register as a new player and bet up to £20 on any sport at any odds. You will then get double the odds with all winnings paid in cash. 18+. #AD

Spend £5 For £20 Of Bets
Ladbrokes
New UK+IRE Customers only. Certain deposit methods & bet types excl. Min first £5 bet within 14 days of account reg at min odds 1/2 to get 4x £5 free bets. Free bets available to use on selected sportsbook markets only. Free bets valid for 7 days, stake not returned. Restrictions + T&Cs apply. 18+. #AD