Khai-Lagai Calculator
Lock in guaranteed profits with Back-Lay betting
BACK
Lagai - Bet FOR
LAY
Khai - Bet AGAINST
What is Khai-Lagai Betting?
Khai-Lagai is simply the Indian terminology for Back and Lay betting on an exchange. Unlike traditional sportsbooks where you play against the house, exchange betting allows you to trade positions against other punters.
Back (Lagai): You are betting for an outcome. If the event happens, you profit.
Lay (Khai): You are betting against an outcome. You act as the bookmaker, offering odds to the market. You win if the event does not happen.
Professional traders use these opposing bets to create arbitrage. By Backing high and Laying low (or vice-versa), you execute a "Book Set" (or Green Book)—guaranteeing a profit regardless of the match result.
How Khai-Lagai Works
Lock in profit by betting both sides at different odds:
- Back at higher odds (e.g., 2.00)
- Wait for odds to move in your favour
- Lay at lower odds (e.g., 1.50)
- Profit guaranteed either way!
Example
Back India ₹10,000 at 2.00. Odds drop to 1.50. Lay ₹13,333 and lock in ₹3,166 profit.
Frequently Asked Questions
What is the difference between Back and Lay?
Backing is placing a bet for an outcome to happen (Long position). Laying is betting against that outcome (Short position). In a Lay bet, you accept Liability—meaning you pay out if the selection wins.
What is a "Green Book" or "Book Set"?
A Green Book (often called a "Book Set" in India) is a trading state where you have locked in a profit on every possible outcome. You achieve this by arbitrage—Backing at higher odds and Laying at lower odds.
How do I calculate Liability?
Liability is the capital you
risk losing on a Lay bet. The formula is Stake × (Odds - 1). For example, Laying ₹1,000 at odds of 1.50 creates a Liability of
₹500. Exchanges lock this amount from your balance until the bet
settles.
What is a "Loss Cut"?
A Loss Cut is a defensive trade used when the market moves against you. You place an opposing bet to neutralize your Liability, ensuring you exit the market with zero loss rather than risking your full stake.
How does Commission affect my profit?
Exchanges (like Betfair or Matchbook) charge a commission on net winnings, typically 2-5%. This calculator automatically deducts this fee to show your actual realized profit, preventing calculation errors.
Why is the Lay stake different from my Back stake?
To achieve an equal profit (Green Book), the math must adjust for the odds difference. Your Lay stake will differ from your Back stake to ensure the net profit is identical regardless of which team wins.