# What Is Overround? The Fee Hidden Inside the Odds Source: https://cricketin.org/guides/what-is-overround [By Nikhil Varma](/authors/betting-analyst), Betting and Odds Analyst. [Reviewed by Rajeev Sathe](/authors/editor-in-chief), Editor-in-Chief. Updated 28 Aug 2026. Editorial policy: https://cricketin.org/editorial-policy 18+ Betting money on cricket carries a direct risk of financial loss, and it can become an addiction. Real-money online gaming is banned across India under the PROG Act 2025, which came into force on 1 May 2026. If betting is already costing you money you need, or sleep, or people close to you, the free Tele-MANAS helpline is **14416**, and it runs in 20 languages. Our [page on help for gambling harm](/guides/help-for-gambling-harm-india) lists what else exists. --- Overround is the fee inside betting odds. See the formula built step by step, the rupee cost on turnover, and how it stacks up over many bets. Overround is the amount by which the chances implied by a set of prices add up to more than 100%. That extra is the seller's fee, and it is charged inside the odds rather than shown as a line item. Two prices of 1.90 imply 52.63% each, so the book adds to 105.26% and the overround is 5.26%. Below we build the formula from scratch, put a rupee figure on six margin levels, explain why small markets cost more, and show what the same fee does to a bankroll over fifty bets. ## The fee nobody puts on the screen Overround is the fee built into the odds. It has other names. Margin, vigorish, vig, hold and juice all mean the same thing ([Whelan, Estimating Expected Loss Rates in Betting Markets](https://www.karlwhelan.com/Papers/Overround.pdf)). You never see it charged. No line on any slip says "fee". It is inside the price itself, so it is taken from every bet, win or lose. The idea is simple. Add up the chance each price implies. If the total goes past 100%, the extra is the fee. A book that adds to exactly 100% is a fair book ([Wikipedia on the mathematics of bookmaking](https://en.wikipedia.org/wiki/Mathematics_of_bookmaking)). Before the maths, one fact. Real-money online gaming is banned in India by the PROG Act 2025, in force from 1 May 2026, and offshore apps are covered too ([Nishith Desai](https://nishithdesai.com/research-and-articles/hotline/gaming-law-wrap/setting-the-rules-of-the-game-indias-online-gaming-law-comes-into-force-15586)). We explain the fee so you can see the cost. Not so you can pay it. ## Where the formula comes from, step by step Start with one price. The chance a decimal price implies is 1 divided by that price ([Wikipedia](https://en.wikipedia.org/wiki/Mathematics_of_bookmaking)). Our page on [reading cricket odds](/guides/how-cricket-odds-work) covers that step in full. Now take every outcome in the market. Add all the implied chances. That total is called the book. Real events have to add to 100%. Something must happen. So any total above 100% is money the seller has priced in for itself. In a research paper the sum of the inverse decimal odds is written as the overround, and the plain margin is that sum minus one ([Whelan](https://www.karlwhelan.com/Papers/Overround.pdf)). **Inputs.** A two-way market. Both sides priced at 1.90. **Formula.** Step 1: chance = 1 ÷ odds. Step 2: book = sum of all chances. Step 3: overround = book − 100%. **Result.** 1 ÷ 1.90 = 52.63%. Both sides: 52.63% + 52.63% = 105.26%. Overround = 105.26% − 100% = 5.26%. **Assumptions.** Only two outcomes exist, so no draw and no tie. Both prices are the ones actually offered at the same moment. The figures are an illustration we built, not a reading taken from any operator. Compare that with a fair pair on the same match. Two prices of 2.00 give 50% plus 50%, which is 100% exactly. Nothing extra. That pair is what a no-fee market would look like. ### Two ways to state the same margin There are two accepted formulas, and they give slightly different numbers. The simple one subtracts 1 from the book. The stricter one is 1 minus (1 ÷ book), which measures the expected payout on a stake ([Whelan](https://www.karlwhelan.com/Papers/Overround.pdf)). **Inputs.** The same 1.90 / 1.90 pair. Book = 1.0526. Turnover ₹10,000. **Formula.** Simple margin = book − 1. Stricter margin = 1 − (1 ÷ book). **Result.** Simple = 1.0526 − 1 = 5.26%, so ₹526 of ₹10,000. Stricter = 1 − (1 ÷ 1.0526) = 5.00%, so ₹500 of ₹10,000. **Assumptions.** Both readings are honest. For small margins the two land close together ([Whelan](https://www.karlwhelan.com/Papers/Overround.pdf)). The tables below use the simple version and label it. ## What the fee costs in rupees A percentage is easy to shrug off. A rupee figure is not. The table takes a turnover of ₹10,000 and shows the expected fee at six margin levels. **Table 1. Six two-way price pairs, the book they add to, and the expected fee on ₹10,000 of turnover** | Price pair | Book (sum of implied chances) | Overround | Fee on ₹10,000, simple formula | Fee on ₹10,000, stricter formula | |---|---|---|---|---| | 2.00 / 2.00 | 100.00% | 0.00% | ₹0 | ₹0 | | 1.95 / 1.95 | 102.56% | 2.56% | ₹256 | ₹250 | | 1.90 / 1.90 | 105.26% | 5.26% | ₹526 | ₹500 | | 1.85 / 1.85 | 108.11% | 8.11% | ₹811 | ₹750 | | 1.80 / 1.80 | 111.11% | 11.11% | ₹1,111 | ₹1,000 | | 1.72 / 1.72 | 116.28% | 16.28% | ₹1,628 | ₹1,400 | Read one row and the point lands. At 1.80 on both sides you hand over about a ninth of everything you stake, on average, before any luck is counted. Skill in picking sides does not remove that. It is charged on the side you back and on the side you avoid. These pairs are illustrations we chose to show the shape of the maths. They are not measurements of any app or any market. ### Markets with three outcomes A Test match can end in a draw, so the market has three prices. The method does not change. Add all three. **Inputs.** Three-way market priced 2.10, 3.40 and 3.60. **Formula.** Book = (1 ÷ 2.10) + (1 ÷ 3.40) + (1 ÷ 3.60). Overround = book − 100%. **Result.** 47.62% + 29.41% + 27.78% = 104.81%. Overround = 4.81%. On ₹10,000 of turnover that is about ₹481. **Assumptions.** Prices are our example, not a quote. A tie is treated as part of the draw price. More outcomes means more places to hide the fee, so always add every one. If you are unsure what counts as an outcome in a given market, our [guide to the twelve common markets](/guides/cricket-bet-types-explained) lists them. ## Why small markets carry a bigger fee Match winner is usually the cheapest market. Small side markets are dearer. There are four reasons, and none of them is a favour to you. - Less information. A seller cannot price a single over as well as a whole match, so it adds padding for its own safety. - Less competition. Popular markets are checked by many people. A niche market is checked by almost nobody. - Fewer bets to balance. A balanced book needs money on both sides ([Wikipedia on bookmakers](https://en.wikipedia.org/wiki/Bookmaker)). Thin markets rarely balance, so the padding stands in for it. - Integrity risk. Small in-match events are the ones targeted in spot-fixing, which is fixing a specific event that a betting market exists on ([Wikipedia on spot-fixing](https://en.wikipedia.org/wiki/Spot-fixing)). Extra margin is the seller's insurance. Exchanges sit at the other end. Users set the price, and the platform takes a commission on net winnings instead of widening the price, so the overround is smaller ([Wikipedia on betting exchanges](https://en.wikipedia.org/wiki/Betting_exchange)). Smaller is not free. The widest fees we found in our own worked examples sit on in-match markets. Our page on [fancy bets](/guides/fancy-bets-explained) shows how those quotes are built, and the [session bet page](/guides/what-is-a-session-bet) covers the fastest-moving ones. ## How the fee stacks up over many bets One bet feels cheap. The fee is not designed for one bet. It is designed for a habit. Think of a bankroll that goes round and round. Each time it is staked, the same percentage is shaved off, on average. That is compounding, and it runs against you. **Inputs.** Bankroll ₹10,000. Margin 5.26% per bet. Whole bankroll re-staked each time. **Formula.** Bankroll left = 10,000 × (1 − 0.0526) raised to the number of bets. **Result.** After 1 bet, ₹9,474. After 5 bets, ₹7,633. After 10 bets, ₹5,826. After 20 bets, ₹3,394. After 50 bets, ₹671. **Assumptions.** This is the average path, not a promise about any real run. It assumes every bet carries the same margin and the whole balance is recycled. Luck makes real results jump around this line. Tax is not included, and tax only makes it worse. Fifty ordinary bets at an ordinary margin turn ₹10,000 into a few hundred rupees on the average path. Nothing unusual happened in that run. No bad luck, no bad picks. Only the fee. Add tax on top of that. A flat 30% tax applies to winnings from online games, under Section 115BBJ ([Income Tax Department](https://www.incometaxindia.gov.in/w/section-115bbj)). Losses cannot be set off against that income ([Income Tax Department](https://www.incometaxindia.gov.in/w/winnings-from-online-games)). Our [page on TDS](/legal/tds-on-winnings-india) works through the withholding rules. ## Measure the fee yourself in one minute You do not need a tool for this. A calculator and four steps are enough. - Write down the decimal price of every outcome in the market. - Divide 1 by each price. Note each percentage. - Add the percentages together. - Subtract 100%. That is the overround. Do it on a match winner market and then on a small in-match market. Compare the two numbers. That comparison tells you more than any review ever could. One point of care. Take all prices at the same moment. Prices move, so a book measured across two minutes is not a book. ## What overround does not tell you The number is useful but narrow. Keep four limits in mind. - It is not your loss on one bet. One bet either wins or loses. The fee shows up over many bets, and the [expected value page](/guides/expected-value-explained) shows how. - It does not say the true chance of the outcome. It only says what the prices imply. - It says nothing about payment, KYC or account limits. Those risks sit outside the maths, and our [page on frozen payments](/guides/payment-freeze-and-chargebacks) covers them. - A margin quoted by anyone selling you something is a claim, not a measurement. Measure it yourself. We have not measured the live margin on any Indian-facing app, and we do not publish operator figures . Any real market margin would need repeated screen captures with time stamps, and our [testing method page](/how-we-test) explains the standard we would need to meet first. The wider set of explainers sits on the [guides hub](/guides), and the law behind the ban is in our [PROG Act explainer](/legal/prog-act-2025-explained). ## Questions people ask ### Is overround the same as commission? No. Overround is inside the price. Commission is charged on top, usually on net winnings, and it is the model exchanges use ([Wikipedia](https://en.wikipedia.org/wiki/Betting_exchange)). ### Does a low overround mean a good bet? It means a cheaper market, nothing more. A cheap fee on a bad pick is still a loss. Margin and value are two separate questions. ### Why do the two margin formulas give different answers? They measure different things. Book minus one measures the padding in the book. One minus the inverse of the book measures the expected payout per rupee staked. For small margins they are close ([Whelan](https://www.karlwhelan.com/Papers/Overround.pdf)). ### Can the overround ever be zero or negative? A book of exactly 100% is a fair book ([Wikipedia](https://en.wikipedia.org/wiki/Mathematics_of_bookmaking)). Below 100% would mean paying out more than is taken, which a seller does not plan for. Where it happens by mistake, it is corrected fast. ### How big is the margin on cricket markets in India? We do not publish a figure. Measuring it would need timed captures from live markets, which we have not done . The tables here are worked illustrations, so use the method on whatever prices you see. ## More from the guides - [APK Sideloading Risks on Android](/guides/apk-sideloading-risks) - [Cricket Bet Types Explained](/guides/cricket-bet-types-explained) - [Cricket Betting Glossary](/guides/cricket-betting-glossary) - [Cricket Formats Explained](/guides/cricket-formats-explained) - [Cricket ID and Agent Accounts](/guides/cricket-id-and-agent-accounts) - [Data Privacy on Gaming Apps in India](/guides/data-privacy-on-gaming-apps) - [DLS Method Explained](/guides/dls-method-explained) - [Expected Value in Betting](/guides/expected-value-explained) - [Fancy Bets in Cricket Explained](/guides/fancy-bets-explained) - [PROG Act 2025 Explained](/legal/prog-act-2025-explained) - [State Gambling Laws in India](/legal/state-by-state) - [Caribbean Premier League 2026 — live schedule and table](/leagues/cpl)