Budgeting for gambling

Spending, not investing

An investment has an expected return above zero. Gambling does not. Every commercial game is designed so that the player gets back less than is staked over time, and the Gambling Commission describes the published return figure as "an average achieved over a significant number of plays, not each time a game is played"⁴.

The practical consequence is that a gambling budget is a spending budget. It belongs in the same mental category as a night out or a subscription, and the correct question is not "will I be up?" but "what will this cost me per hour, and can I afford that?"

GambleAware puts the first step in one sentence: "Before you gamble, decide what your spending limit is for the day, week, or month, and commit to it"⁷.

The cost of an hour

You can work out the average cost before you start. Three numbers are needed.

1. Stake per round. What you commit each time.
2. Rounds per hour. How fast you play.
3. House edge. The share of each stake the game keeps on average.

House edge is "the ratio of the average loss to the initial bet"⁵. For a game with one fixed return figure it is 100% minus the return, so a 96% game has a 4% edge. The derivation is set out in our house edge guide, and the meaning of the return figure in return to player explained.

The formula is then:

Expected cost per hour = stake per round × rounds per hour × house edge

Why speed is the term people forget

Stake size gets all the attention, but it is multiplied by pace, and pace varies enormously.

Great Britain sets a floor: "It must be a minimum of 2.5 seconds from the time a game is started until the next game cycle can be commenced"¹. At that minimum, an hour of uninterrupted play is at most 1,440 rounds, calculated as 3,600 seconds divided by 2.5. Autoplay is not permitted there either, since "The gambling system must require a customer to commit to each game cycle individually"².

Markets without such rules can run faster. The point stands in either case: doubling your speed costs the same as doubling your stake.

Worked example (hypothetical)

The stakes and pace below are invented to show the arithmetic. The house edge used is 4%, which corresponds to a 96% return. Each cell is stake × rounds × 4%.

Working for the middle cell: 800 rounds × £1 = £800 staked in the hour. £800 × 4% = £32.

Note what the £800 figure represents. It is turnover, not money brought to the session. Most of it is the same money being recycled through wins and restaked.

The same session at different house edges

Holding stake and pace fixed at 800 rounds of £1, only the edge changes.

Slot house edges published by the Wizard of Odds span a wide band, from 2% to 15%⁵. Table games sit lower and narrower: single-zero roulette carries a 2.70% edge on all bets, double-zero roulette 5.26%⁶.

Turning the number into a limit

Once you have a cost per hour, a budget becomes a decision about time as well as money.

• Decide the amount first, then the session length. If £30 is the limit and the game costs roughly £32 an hour at your pace, the session is about an hour, not an evening.
• Set the limit in the account, not in your head. Regulators in Great Britain require operators to provide facilities "to enable them to set and maintain a gambling budget that is suitable for their personal circumstances", including deposit limits and loss limits where the amount lost is restricted³.
• Expect a delay on increases. Customer-led limits there "must only be increased at the customer's request, only after a cooling-off period of at least 24 hours has elapsed", with positive action needed afterwards to confirm³. That delay is the feature, not the obstacle.
• Watch the net position, not the last spin. All gaming sessions in Great Britain must "clearly display a customer's net position" since the session started, defined as total winnings minus total losses⁸.

The available tools and how to set them are covered in responsible gambling tools.

Why chasing losses fails

Chasing is the attempt to win back what has been lost by continuing to play, usually at a larger stake.

It fails for a reason that has nothing to do with luck. Every additional round carries the same expected cost as the ones before it, because results are independent. Adding rounds adds turnover, and expected loss rises with turnover. Raising the stake raises it faster.

So the expected size of the hole grows with every attempt to fill it. GambleAware states the practical version: "If you've lost the money that you set as your limit, it's time to walk away. Trying to win back your losses often leads to even bigger losses"⁷.

Regulators treat it as a design risk too. Products in Great Britain "must not actively encourage customers to chase their losses, increase their stake or increase the amount they have decided to gamble, or continue to gamble after they have indicated that they wish to stop"¹.

Chasing losses also appears on the NHS list of questions used to identify gambling problems, alongside betting more than you can afford to lose and borrowing money to gamble⁹.

Never stake borrowed money

This is the one rule with no trade-off attached.

When Great Britain prohibited credit card gambling from 14 April 2020, the Commission cited research finding that "22% of online gamblers using credit cards to gamble are classed as problem gamblers – with even more at some risk of harm"¹⁰.

Borrowing converts a capped entertainment cost into an uncapped debt with interest attached. Overdrafts, buy-now-pay-later arrangements and loans from friends all create the same structure as a credit card, whatever the local rules say.

Signs the budget is not working

• The limit has been raised more than once.
• Money intended for something else has been used.
• Sessions run longer than planned, routinely.
• The account balance is checked more often than the net position figure.
• Losses are hidden from people close to you.

Any of these is worth acting on early. signs of gambling harm sets out the fuller picture and the screening tools used to assess it.

Gambling involves financial risk and is not a way to make money. If you are worried about your gambling, our responsible gambling page lists free support.