Work out your lay stake, liability, and qualifying loss instantly — for normal bets, free bets (SNR/SR), and risk-free bets. No signup needed.
A matched betting calculator works out the lay stake you need to place on a betting exchange to cancel out a "back" bet placed with a bookmaker — leaving you with a small, known qualifying loss (or a locked-in profit, when using a free bet). Instead of doing the maths by hand, you enter your back stake, back odds, lay odds, and commission, and the calculator does the rest instantly.
Choose your bet type — Normal for a qualifying bet, or Free Bet (SNR/SR) and Risk Free for offer-specific calculations. Enter your back stake and back odds from the bookmaker, then your lay odds and commission from the exchange (e.g. Betfair or Smarkets). The calculator shows your lay stake, liability, and the outcome if either side wins.
This calculator is free to use with no account needed. If you're placing matched bets regularly, GreenUp lets you log every bet, track your bankroll across bookmakers and exchanges, and see your overall profit — automatically, without spreadsheets.