Money kept

How much money have you kept by not drinking?

Use your own spending as the baseline. LastGlass turns clear days into an estimate of money kept, with a formula you can check and assumptions you can change.

Updated 2 November 2026 · 4-minute read · By VANTH Studio, The Netherlands

Start with the spending you recognise

Your weekly baseline should describe your previous usual drinking, rather than an unusually expensive night out. Include the mix of drinks you actually bought: supermarket purchases and bar prices can be very different. If you do not know the average, use a cautious figure and update it when you have better information.

The average price is an input, not a fact LastGlass can discover from your bank. The app does not inspect your purchases or connect to a bank account.

Three examples you can check

Each row uses the same formula. A week of seven clear days corresponds to one previous week of spending. Thirty days corresponds to 30 ÷ 7 weeks, so it should not simply be treated as four weeks.

LastGlass rounds the result to two decimal places. The website calculator uses the same weekly-baseline formula and shows cents or pennies, rather than rounding the entire estimate to a whole currency unit.

What the number leaves out

The estimate does not include restaurant meals, taxis, delivery orders or other spending you might associate with drinking. It also does not subtract alcohol-free replacements, hobbies or rewards you buy instead. Those choices may matter to your budget, but the tracker has no evidence of them.

It does not predict investment returns or future wealth. And it is not a full estimate of reduced drinking on days when you still drank: its input is clear days. For a moderation goal, your recorded drinks and weekly target answer a different question.

Clear days and an uninterrupted date range

In the app, recorded drinking days affect your clear-day total. This website’s calculator knows only the date you enter and assumes an uninterrupted alcohol-free period. If your journey includes drinking days, do not treat that date-only result as your app’s actual spending total. See how the counts differ.

Keep the estimate useful

Use one currency for both your baseline and result; selecting a different currency label does not convert exchange rates. Recheck your baseline when it no longer describes the habit you are comparing against.

The money-kept estimate is a free LastGlass feature. Optional LastGlass+ savings goals let you give that estimate a purpose, such as a trip or gift. A goal does not move or reserve money. Try your numbers in the browser, then decide whether you want a daily record in the app.