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At AiProfit, our matched betting calculator, also known as a lay bet calculator, helps you quickly calculate lay stakes, liability, and profit for both qualifying bets and free bets, and it’s completely free. Whether you're just getting started or already experienced, this tool removes the guesswork so you can place matched bets accurately and consistently.
Instead of doing the maths manually, simply enter your back odds, lay odds, stake, and exchange commission. The calculator instantly returns the exact figures you need. This helps reduce qualifying losses, avoid common mistakes, and move through bookmaker offers faster and more confidently.
Our matched betting calculator is designed to help you turn bonus bets into real, withdrawable cash in the simplest way possible.
Matched betting works by using bookmaker promotions and covering all outcomes on a betting exchange. If you're new, it’s worth first understanding what matched betting is.
Our lay bet calculator makes this process easy by showing you the correct lay stake and liability in seconds, so you know exactly what profit to expect before placing your bets.
If you’re unsure how exchanges work, read our lay betting guide.
Whether you're working through multiple offers or focusing on one at a time, the calculator keeps everything quick, organised, and consistent so you can stay efficient and avoid costly errors.
A matched betting calculator is a tool that helps you work out the correct stakes for your back bet with a bookmaker and your lay bet on a betting exchange.
By entering your odds, stake, commission, and bet type, the calculator returns:
This allows you to aim for a controlled result regardless of the outcome.
Think of it as removing the hardest part of matched betting. Instead of calculating everything manually, the tool handles the maths for you, reducing errors, saving time, and making the process much easier to follow.
This is our primary matched betting calculator for standard back-and-lay workflows, including qualifying bets, free bets, and commission adjustments.
Once you're comfortable with matched betting, you may choose to slightly adjust your lay stake instead of always equalising profit.
These adjustments are optional and typically used by more experienced bettors looking to maximise value over time.
Our calculator supports both overlay and underlay, so you can experiment when you're ready. If you're new, it's best to stick to equal profit while learning the process.
Looking for accumulators and system bets instead? Visit our bet calculator hub for acca, Yankee, Lucky 15, and other multi-line bet structures.
You can learn how to make money with matched betting using AiProfit’s full set of tools, including the matched betting calculator, OddsMatcher, and more. These tools help you stay fast, accurate, and consistent with every offer.
If you're new, start with:
Once you're comfortable, you can use the matched betting calculator to turn offers into real, consistent profit.
It uses your back odds, lay odds, stake, and exchange commission to calculate the lay stake, liability, and expected result. This helps you compare both outcomes before you place the bets.
Use qualifying bet mode when your bookmaker stake is your own money and you want to minimise the qualifying loss. Use free bet mode when the stake is promotional credit and the calculator should not treat the free bet stake as part of the return.
Enter the bookmaker stake and odds, the exchange lay odds, and the commission rate. The calculator returns the lay stake needed to balance the back bet and lay bet as closely as possible.
Liability is the amount you need available at the exchange in case your lay bet loses. The calculator shows liability before you place the lay bet so you can check that your exchange balance is high enough.
Yes. Commission changes the net return from the lay bet, so including it gives a more accurate lay stake and profit estimate.
Underlaying or overlaying shifts more profit to one outcome instead of balancing both sides evenly. Beginners should usually use the standard calculated lay stake until they understand the tradeoff.
Yes. If the bookmaker odds, exchange odds, stake, or commission changes before you place the lay bet, recalculate before continuing.
Manual calculations are slower and easier to get wrong. The calculator updates the lay stake, liability, and estimated result instantly, which reduces the chance of a staking mistake.