Budgets
Expense Radar AI lets you set one spending limit per category. From that single decision, the app shows you whether you're on track this week, this month, and this year — automatically. This page explains why three time windows exist and how the projected amounts are calculated.
Why three time windows?
This Week
Best for variable, frequent spending: groceries, dining out, petrol. A weekly rhythm matches how most people shop.
This Month
Best for recurring fixed costs: rent, subscriptions, utilities, and insurance premiums on a monthly billing cycle.
This Year
Best for low-frequency, high-value spending: travel, annual memberships, year-end gifts. Keeps you on track all year.
One budget per category. You set a single spending limit for Groceries (for example, €250/week). The app projects that amount up to monthly and yearly for you — automatically. You never need to set three separate limits for the same category — each time window draws from the same underlying budget.
How projections work
| Base budget | Projects to | Formula | Label in app |
|---|---|---|---|
| Weekly | This Month | weekly × days_in_month / 7 | ~ amount |
| Weekly | This Year | weekly × days_in_year / 7 | ~ amount |
| Monthly | This Year | monthly × 12 | ~ amount |
| Yearly | — | — | base amount |
The ~ prefix means projected. When Expense Radar AI shows ~€1,071, that is not a limit you set — it is derived from your weekly budget using the formula above. Projected limits update automatically when the month or year has more or fewer days.
Worked example — Groceries, €250/week
Your weekly budget
You set €250/week for Groceries. This is the one value you control.
Monthly projection (June, 30 days)
250 × 30 / 7 = €1,071.43 → shown as ~€1,071. (Why not ×4? Because 30/7 = 4.286, not 4. Multiplying by 4 would undercount by 14%.)
Yearly projection
250 × 365 / 7 = €13,035.71 → shown as ~€13,035.
Your actual spending
You've spent €620 this month. 620 / 1,071.43 = 57.9% → shown as 58%. Status: on track.
On track
€620 spent · ~€1,071 limit this month
Budget preview — This Month
Groceries and Dining Out are tracked weekly — Expense Radar scales each weekly limit across the month so you always have a fair target. A €250/week grocery budget works out to ~€1,071 over 30 days; €50/week for Dining Out becomes ~€214. Subscriptions is different: its €150/month cap is fixed, so it shows exactly as set.