- Fact-checked by Josh Miller
- Edited by Diana Westfield
Value betting means backing a price that’s bigger than the real chance of the outcome deserves. Nothing else in betting matters as much. A team that wins half its games is fairly priced at 2.0; at 2.2 it’s value, at 1.8 it isn’t, and whether the bet wins on Saturday has nothing to do with which side of that line you were on. Over hundreds of bets, though, it decides whether you end up in profit.
What is value betting, with numbers?
Convert the odds to a chance: implied probability is 1 divided by the decimal odds. 2.2 implies 45.5%. If you believe the true chance is 50%, the bet is worth 0.50 × 2.2 = 1.10 per £1 staked, a 10% edge. Bet £10 a hundred times on chances like that and you’d expect to finish about £100 up, give or take a lot.
The “give or take a lot” matters. Even with a real 10% edge, a run of a hundred bets at around evens can easily finish down. The CasinoCalcs betting variance calculator shows how wide the range is, and the expected value calculator does the edge sum for any bet.
Where value comes from
You need a better estimate than the market’s, at least on some bets. Bookmakers’ prices include a margin, so to find value you have to beat the price by more than that margin. Common sources are specialist knowledge of smaller leagues, quick reactions to team news, or comparing soft bookmaker prices with sharp exchange prices. The no-vig calculator strips the margin out of a market to give a fair price to compare with.
A good test of whether you’re finding value is closing line value: do the prices you take tend to shorten before kick-off? If they do, you’re usually ahead of the market. The CLV calculator tracks it.
Value betting vs sure bets
Sure bets, also called arbitrage, back every outcome at different bookmakers so that you win a small amount whatever happens. There’s no variance, but the margins are thin and bookmakers restrict accounts that arb. The arbitrage calculator sets the stakes. Value betting is the opposite trade: you accept losing bets in return for a better average. To size your bets once you’ve found an edge, the Kelly criterion calculator is the standard tool.
Value is about averages, not certainties. BeGambleAware.org has free support if losing runs are hard to take.