What does the Free bet SNR calculator show?

It estimates the SNR lay stake and extracted value before charges and market constraints.

Should I treat the result as a forecast?

No. It's arithmetic on the numbers you entered. Market rules, settlement mechanics and price movement all change how a real bet lands.

Free Bet SNR Calculator for Return and Lay Stake

Last updated: 22 August 2026 Written by Ellie Marsden, Senior Betting Editor Fact checked by Tom Brackley, Odds Analyst

What this calculator answers

Estimate the cash value of a stake not returned free bet by comparing the free bet back position with an entered lay price and commission rate.

Formula and worked example

Formula: Lay stake = free bet stake times (back odds minus 1) divided by (lay odds minus commission). Extracted value is lay stake times (1 minus commission).

For a 10.00 free bet at 5.00, lay odds 5.20 and 2 percent commission, the lay stake is 7.72. If the lay side wins, the extracted value is about 7.57.

Checks before using the result

Using the stake returned formula for a stake not returned bet.
Entering commission as 2 instead of 0.02 in a manual formula.
Ignoring minimum stakes and market availability.

When the calculation does not apply

It applies to a stake not returned free bet only. Price movement, partial matching, limits, charges and market rules can change the outcome.

Keep the number in context

A calculator shows the arithmetic. It doesn't tell you whether the price fits your read of the outcome or your budget. Decide the stake before you enter it. Check the market rules. Keep essential money out of it entirely.

Cross-check on a second tool. The calculator hub, Odds converter or System bet cover the same numbers from a different angle. Same price conventions, so a decimal price in one is a decimal price in the other.

Read the guide to free bets if you're new to the formats. Two minutes.

Reading a rounded result

Money is rounded to two decimals here. A real settlement applies its own rounding sequence, which can differ. Keep the original inputs written down if you're going to check the number later.

Unclear about an input? Find the stated market term. Don't guess. A quick sanity check: change one input by a small amount and see whether the result moves the way you expect.

That doesn't validate the market. It can flag a reversed sign, a mis-entered price format or a duplicated stake. Use the number to understand the arithmetic. It's not a reason to ignore a limit you set in advance.