Guide · 7 min read
Dropping odds explained: why prices fall, what steam is and what it means for you
Dropping odds are prices that have fallen noticeably since they opened. Sites list them, forums treat them as tips. This guide explains why prices really fall, how a steam move spreads from one bookmaker to the next, what dropping-odds lists leave out, and why a falling price matters to sure bettors mainly as a clock that is running.
Updated 22 October 2026
Contents
What dropping odds are
A price is a probability in disguise: the implied probability is 1 divided by the odds. If the price on a home win falls from 2.40 to 2.10, the implied probability rises from 41.7% to 47.6%. The bookmaker now rates the home win as more likely, or simply wants to take less money on it.
Because a bookmaker spreads its margin across all outcomes, the other prices usually move too. When the home win shortens, the draw and away win often lengthen slightly. A price move is therefore always a shift across the whole market, not just one number getting smaller.
Why odds fall
Behind almost every larger move is one of three causes, often several at once:
- New information. A regular starter is out, a goalkeeper is carrying a knock, the weather changes the pitch. In football, official line-ups usually come out about an hour before kick-off, and that is exactly when many markets move again.
- Money. When a lot of money lands on one side, the bookmaker shortens that price to limit its risk. Bookmakers take stakes most seriously from customers who have often beaten the closing price in the past. One large bet from such a customer can move a price more than many small recreational bets.
- Models and the market. Many bookmakers take prices from data suppliers or follow high-limit, low-margin bookmakers. When the price changes there, they adjust theirs, even without any new information of their own.
How bookmakers build their prices in the first place, and why they differ, is explained in how bookmakers set odds.
Steam: when many bookmakers move at once
Bettors call a fast move in the same direction across many bookmakers steam, or a steam move. The typical sequence: a high-limit bookmaker that prices closely to its customers' money shortens a price. Other bookmakers and odds suppliers see it and follow, the big ones usually within seconds to a few minutes, smaller and local bookmakers sometimes much later.
In the gap between the first and the last to follow, a slow bookmaker briefly shows a price above the new market price. That is where many sure bets come from, and they disappear as soon as the slow book has caught up. There is no fixed time window: it depends on the bookmaker, the sport, the league and the time of day. Books that react fast and books that react slowly are compared in sharp vs soft bookmakers.
What dropping-odds lists show and what they don't
Dropping-odds pages list matches where a price has fallen by a certain percentage since opening. That is useful for seeing where something is happening. What these lists don't show:
- The reason. A falling price can mean an injury, big money, or just the correction of an opening price that was too high.
- Whether the new price is fair. After the drop, the price is often exactly right or even too short. Anyone getting in now gets the worse price.
- How much money is behind it. Opening prices often have low limits. A 10% drop can be triggered by a handful of bets.
- Which bookmakers haven't followed yet. Many lists show only an average or a single bookmaker.
What falling prices mean for sure bets
For sure bets, a falling price is mainly a timing problem. The sure bet often exists only because one bookmaker still offers the old, higher price. A worked example with a tennis match, two outcomes, €500 total stake:
Bookmaker A still offers 2.25 on player 1, bookmaker B offers 1.90 on player 2. The 1/odds test: 1/2.25 + 1/1.90 = 0.4444 + 0.5263 = 0.9708, so below 1.
You stake €228.92 at A and €271.08 at B. Either side returns about €515.06 if it wins: roughly €15, or 3.0%, ahead, provided both bets are accepted at these prices and stand.
1/2.05 + 1/1.90 = 0.4878 + 0.5263 = 1.0141. The sum is above 1 and the sure bet is gone.
If you had already placed the bet at B and A has dropped in the meantime, you hold an open single bet on player 2, not a covered pair.
Two practical rules follow. First: place the leg at the bookmaker whose price is lagging, because that is the one most likely to vanish. Second: check the price on the bet slip before the second leg, not just in the list. What to do when one leg is no longer available at the old price is covered in odds changed or one leg failed. Assumptions in the example: decimal odds, amounts rounded to the cent, no betting fee. If one of the bookmakers passes on Austria's 5% betting fee, calculate with the price after the deduction.
Dropping odds and closing line value
Closing line value (CLV) compares your price with the price just before the start: CLV = your odds / closing odds − 1. If you took 2.25 and the price closes at 2.05, your CLV is 2.25 / 2.05 − 1 = +9.8%. A price that falls after your bet is therefore a sign that you got a price above the later market price.
A sign, nothing more: a single bet with positive CLV can still lose, and even a long run of them says nothing certain about future results. More on CLV and the fair closing price without margin in closing line value. Value bets are not yet available in ArbVantage (coming soon); the live product is sure bets, free-bet conversion and middles.
Myth: a falling price means a safe tip
Many people read a falling price as a signal that "someone knows more". Even if that is true, the maths stays sober: after the drop from 2.40 to 2.10, the market rates the home win at about 47.6%. More than half the time the match ends differently. And anyone following the move gets the new, shorter price, which already has the information priced in, plus the bookmaker's margin.
No price move makes an outcome certain. Following dropping odds still means betting on an uncertain result, and you can lose.
FAQ
Are dropping odds a tip?
No. A falling price only shows that the market now rates an outcome as more likely, or that a lot of money has been staked on it. The new price already contains that information. Anyone following the move gets the shorter price and can still lose.
How fast do bookmakers follow a price move?
Large bookmakers with their own trading teams often within seconds to a few minutes, smaller and local bookmakers sometimes later. There is no fixed time; it depends on the bookmaker, sport, league and time of day. So always check the price on the bet slip before every bet.
What is steam in betting?
Steam is a fast price move in the same direction at many bookmakers at once. It usually starts at a high-limit bookmaker and spreads as other bookmakers and odds suppliers follow.
Why did my sure bet disappear before I placed the second leg?
Usually because the bookmaker with the higher price followed the market and shortened its odds. Sure bets often exist only while one book is slower than the rest. Check both prices on the bet slips and place the lagging leg first.
Sources
- Levitt, S. D. (2004): Why are gambling markets organised so differently from financial markets? The Economic Journal 114(495), 223–246
- Forrest, D., Goddard, J., Simmons, R. (2005): Odds-setters as forecasters: The case of English football. International Journal of Forecasting 21(3), 551–564
- Angelini, G., De Angelis, L. (2019): Efficiency of online football betting markets. International Journal of Forecasting 35(2), 712–721
As of October 2026. The studies describe how prices form and move; no conclusions about individual bookmakers can be drawn from them.
Betting carries risk, sure bets included: odds change, bets get voided and accounts get limited. Only stake money you can afford to lose. Our responsible gambling page lists free, confidential help in Austria and Germany.
Not betting, legal or tax advice. 18+. As of October 2026.