BetArbi is a free suite of betting calculators. The surebet / arbitrage calculator handles 2 to 15 outcomes: enter the odds and your stake, and it splits the bets so you profit no matter the result. There's also a free-bet calculator and an odds converter (decimal, fractional, American, implied probability). No sign-up, no paywall, nothing stored — everything runs in your browser.

Hey Product Hunt 👋 I'm the maker of BetArbi — this one started as a scratch-my-own-itch tool. I do a bit of sports arbitrage ("surebets") — betting on every outcome across bookmakers so you profit no matter the result. The maths is simple but tedious by hand, so years ago I built a little offline calculator just for me. Friends kept asking for it, so I turned it into a proper free site. What it does: • Surebet / Arbitrage Calculator — 2 to 15 outcomes. Enter the odds + stake, it splits the bets for an equal, guaranteed profit. • Free Bet Calculator — turn a free bet into locked-in profit. • Odds Converter — decimal, fractional, American & implied probability. Everything runs in your browser. No sign-up, no account, nothing stored, no paywall. Just the tools. I'd genuinely love feedback — what's confusing, what's missing, which betting calculators you'd want next. Thanks for checking it out 🙏

love that the whole suite runs client-side with no signup or paywall, the kind of "just works in your browser" build that betting tools almost never pull off cleanly.

@ravzakemerci Thank you so much!

love that the whole suite runs client-side with no signup or paywall, the kind of "just works in your browser" build that betting tools almost never pull off cleanly.

@ravzakemerci Thank you so much!

BetArbi

Free surebet & arbitrage calculators, no sign-up

Free surebet & arbitrage calculators, no sign-up