Guide
March 26, 2026
8 min read
Beginner
How Matched Betting Works — Complete 2026 Guide
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Matched betting is a mathematical technique that converts sportsbook promotional offers — free bets, bonus bets, and profit boosts — into guaranteed cash profit. It is not gambling. The outcome of the event is irrelevant. You profit either way.
The Core Concept
Every sportsbook promo relies on you placing a bet with them and hoping you win (or lose, so you keep playing). Matched betting uses a counter-bet at a second platform to neutralise the outcome risk, leaving only the value of the promo as guaranteed profit.
There are two types of matched betting:
- Bonus Bet Conversion — Convert free bet / bonus bet credits into cash
- Profit Boost Extraction — Lock in the extra profit from a percentage boost token
How Bonus Bet Conversion Works
A bonus bet (also called a free bet in the UK) is a credit from a sportsbook that lets you place a bet without risking your own money. The catch: if you win, you only receive the profit — your stake is NOT returned. A £30 bonus bet on +300 (+3.00 decimal) returns £90 profit, not £120.
The strategy: place the bonus bet on an underdog with high odds (typically +250 to +400 in American, or 4.0–5.0 decimal). Then place a cash bet on the opposing side at another sportsbook. One side wins, one loses — you collect net profit regardless of outcome.
Worked Example — $200 Bonus Bet
Sportsbook A: Bonus Bet on Warriors +350+350
Sportsbook B: Cash hedge on Lakers -400-400
Bonus Bet Size$200
Hedge Stake (calculated)$155
If Warriors win: Profit from Sportsbook A+$700 − $155 = +$545... wait
If Warriors win: Net (win $700, lose hedge $155 stake + lay)+$149
If Lakers win: Hedge wins, lose $0 (bonus bet)+$149
Guaranteed profit either way~$149 (74.5% of $200)
The PromoGrind Bonus Bet Converter calculates the exact hedge stake and guaranteed profit automatically. You never need to do this math by hand.
Step-by-Step: Your First Matched Bet
- Get the bonus bet credit. Sign up at DraftKings (or any book) and complete the qualifying requirement — usually a first deposit and a bet. Your bonus credit appears in your account (e.g., $200 in bonus bets).
- Find a game with an underdog at +250 to +400. Look across your sportsbook apps. You want both the underdog AND the favorite available at two different books so you can hedge. DraftKings and FanDuel are ideal pairs.
- Enter the numbers into PromoGrind. Open the Bonus Bet Converter. Enter: bonus bet size, the underdog odds (where you'll place the bonus), and the favorite odds (where you'll hedge with cash). The calculator shows your hedge stake and guaranteed profit instantly.
- Place both bets immediately. First place the bonus bet at Sportsbook A. Then immediately place the cash hedge at Sportsbook B for the calculated amount. Speed matters — odds can move.
- Collect your profit. One side wins. You collect the winning payout. Subtract the losing stake. The net result is your guaranteed profit — no matter who won the game.
Conversion Rate: How Much of the Bonus Bet Can You Keep?
The conversion rate — the percentage of the bonus bet face value you capture as cash — depends on the underdog odds. Higher odds = higher conversion rate, up to a point.
| Underdog Odds | Hedge Odds (approx.) | Conversion Rate | $200 Bonus Profit |
|---|
| +200 | -250 | ~58% | ~$116 |
| +250 | -300 | ~64% | ~$128 |
| +300 | -350 | ~68% | ~$136 |
| +350 | -400 | ~72% | ~$144 |
| +400 | -450 | ~75% | ~$150 |
| +500 | -600 | ~75% | ~$150 |
| +700 | -850 | ~68% | ~$136 (drops due to vig) |
The +300 to +400 range is optimal — high enough for good conversion, but with enough exchange/second-book liquidity to find a reliable hedge.
Profit Boost Conversion
Profit boosts are recurring daily promos — DraftKings, FanDuel, and Caesars all offer 2–5 per day. A 50% profit boost on a -110 moneyline effectively gives you +EV odds. Hedge the boosted side against the opposing side at another book to lock in profit.
Use the PromoGrind Profit Boost Converter to calculate the exact hedge amount. With 5–10 boosts per day across 5–6 books, experienced grinders lock in $300–$1,000/month in recurring profit.
Common Mistakes to Avoid
- Not hedging immediately. Odds move. If you place the bonus bet and wait to hedge, the lines can move against you.
- Using the bonus bet on a heavy favorite. Betting your free bet on -200 odds means low payout if it wins — terrible conversion rate. Always use the bonus bet on the underdog side.
- Ignoring the vig. The spread between book A and book B creates a small qualifying loss. The calculator accounts for this automatically.
- Using one book for both legs. Both bets must be at different sportsbooks. Some books will restrict accounts that show large offset betting patterns.
Important: Matched betting involves real money transactions. Always verify the calculator's output before placing bets. Odds can change between when you calculate and when you place — recheck if more than a few minutes have passed.
How Much Can You Make?
Realistic estimates for a new US matched bettor in 2026:
- Month 1 (sign-up season): $1,000–$3,500 from welcome promos across 6–8 sportsbooks
- Ongoing (monthly recurring): $300–$1,200/month from daily profit boosts and reload bonuses
- Year 1 total: $4,000–$12,000 depending on hours committed and state availability
Results vary by state (more legal books = more income), time investment, and willingness to track and optimise each promo. The PromoGrind Promo Calendar shows you exactly which promos to run each day.
Ready to Start?
Use the free PromoGrind calculator to convert your first bonus bet. Enter the numbers and get the exact hedge stake in seconds.
Open Bonus Bet Converter →