I have tried Mint. I have tried YNAB. I have tried spreadsheets with 47 categories and color-coded graphs that took longer to update than the money was worth. Every system worked for about six weeks, then I stopped logging things, then I felt guilty, then I deleted the app.

The system that finally stuck — and has been sticking for over two years — is so simple it is almost embarrassing. But it works. Here it is.

The Weekly Number Method

Instead of budgeting by month — which is too long to track and too abstract — I budget by week. Here is how:

1. Add up your necessary expenses: rent, utilities, subscriptions, insurance. These are fixed.
2. Subtract that from your monthly take-home pay.
3. Divide what remains by 4.3 — the average number of weeks in a month.
4. That number is your weekly spendable amount.

For me, that number is $175 per week. That covers groceries, gas, eating out, random purchases, entertainment — everything that is not a bill. If I spend less than $175 this week, the leftover rolls into next week. If I spend more, I cut back next week.

Why Weekly Works Better Than Monthly

A month is too long. By week three I have lost track. A week is short enough that I can remember every purchase. I do not need an app. I just know if I have spent $140 by Thursday, I have $35 left for the weekend. That is actionable.

Monthly budgets tell you you overspent three weeks after you did it. Weekly budgets tell you on Thursday that you should probably cook dinner instead of ordering delivery.

The One Spreadsheet I Keep

I do track one thing: a simple spreadsheet with four columns — date, amount, category, and “needed?” The last column is the most important. Every purchase gets a yes or no. At the end of the month I look at the “no” column. That is where all the real savings are hiding.

Last month my “no” items — things I bought but did not actually need — totaled $87. That is over $1,000 a year on stuff I cannot even remember buying a month later.

The Rule That Stopped Impulse Buys

Anything over $30, I wait 48 hours before buying. If I still want it two days later, I buy it. Most things — probably 80% — I forget about entirely within those 48 hours. The things I do buy, I feel good about because I know they were not impulsive.