How much can I spend this week?
Your salary arrives once a month, but the spending happens every day. Put in what comes in and what is already committed, and this turns the month into one weekly number — and, if you tell it what you have spent so far this week, what is left for today.
How the weekly number is worked out
Bills and savings come off the top first, because neither is optional. Whatever is left is the only money you are genuinely free to spend this month, and that is the part that gets split into weeks.
per week = free to spend ÷ 4
left for today = (per week − spent this week) ÷ days left in the week
Doing it in that order means the two views always agree: four weeks of spending plus the bills plus the savings adds back up to your income. If a weekly figure and a monthly figure ever disagree, one of them has stopped subtracting the bills.
Four weeks or 4.33?
A year has 52 weeks, so an average month has 4.33 of them. Dividing by four gives a rounder, slightly larger weekly number and leaves the two or three extra days of a long month unfunded — which is why the calculator tells you how much to keep aside for them. Dividing by 4.33 is exact, but the figure is awkward and no longer lines up with a calendar week. Most people who stick with weekly budgeting choose four and treat the number as a ceiling, not a target. The full argument is in weekly budget vs monthly budget.
Which day should the week start?
Start the week on the day your spending naturally resets — the day after the big grocery shop, or the first working day. In the UAE the federal working week moved to Monday to Friday in 2022, so a Monday start fits most households; if your weekend shop happens on Sunday, start on Sunday instead. What matters is that it never moves, because a fixed reset day is what makes a weekly budget feel fair.
What "left for today" means
It divides what remains of this week by the days remaining, counting today. Spend more on Tuesday and Wednesday's figure simply comes out a little smaller. Nothing needs to be re-planned; the correction happens on its own and stays proportionate, which is the reason a daily figure is easier to live with than a weekly total.
Weekly budgets in a shared household
One person with one weekly number is easy. Two people spending from the same number is where it breaks, because each of them only knows what they spent. By Thursday the number in each head is wrong in a different direction. A shared weekly budget needs a shared view of what has already gone, updated when anyone spends — that is the problem EXPENDR was built for.
This weekly number, kept up to date for the whole family
EXPENDR takes your bills off the top, splits the rest into weekly budgets, and updates everyone’s “left for today” the moment anyone adds an expense. Weekly budgets, budget alerts and the weekly recap are free. English and Arabic, 55 currencies.
More free tools
- Daily budget calculator — what you can safely spend today
- 50/30/20 budget calculator — split your salary into needs, wants and savings