Weekly Budget Calculator
Budget on a weekly rhythm: fixed costs, flexible spending and what is left — annualized.
Weekly pay often means weekly budgets. This calculator works in weekly numbers and also shows the annual picture so nothing gets lost between “this week” and “this year”.
At a glance
- What you enter
- Weekly income, Fixed weekly costs, Flexible weekly spending
- What you get
- Left each week, Left over a year
- Formula shown
- Yes — every step, right below your results.
- Cost and privacy
- Free, no account needed, and nothing you type is stored.
See worked examples ↓ Read the FAQ ↓ Share this calculator ↓
Results are estimates for general information only — always verify with a professional or official source before acting on them.
How to use the Weekly Budget Calculator
- 1 Enter Weekly income
- 2 Enter Fixed weekly costs
- 3 Enter Flexible weekly spending
- 4 Press Calculate. You get Left each week, Left over a year, and every intermediate step stays visible under “How is this calculated?”
- 5 Change one number at a time to see what moves the result — that is usually the most useful thing a calculator can tell you.
Worked examples
Real numbers run through this calculator. Open any example to load it into the form above and change it.
$800 a week with half going to fixed costs
Rent, bills and transport of $400 against $250 of flexible spending.
You enter
- Weekly income
- $800.00
- Fixed weekly costs
- $400.00
- Flexible weekly spending
- $250.00
You get
- Left each week
- $150.00
- Left over a year
- $7,800.00
The weekly leftover is $150, which is $7,800 over a year. Fixed costs take exactly half of income and flexible spending 31.25%, so there is not much room left to cut if the leftover needs to grow.
$1,200 a week with higher commitments
A larger income carrying $550 of fixed costs each week.
You enter
- Weekly income
- $1,200.00
- Fixed weekly costs
- $550.00
- Flexible weekly spending
- $400.00
You get
- Left each week
- $250.00
- Left over a year
- $13,000.00
The leftover rises to $250 a week, or $13,000 a year, and flexible spending is 33.33% of income. Compared with the first example the spare cash is larger, but the fixed commitments also grew.
Guides that go with it
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Frequently asked questions
How do I turn monthly rent and bills into weekly fixed costs?
Multiply the monthly amount by 12 and divide by 52 — or simply divide by 4.33. Dividing by 4 instead is the classic error: it understates a monthly bill by about 8%, so a $1,300 rent becomes $300 a week rather than the correct $325. Add every monthly bill up first, then convert the total once.
Why does the annual figure assume 52 weeks?
Because 52 weeks is what a year contains, and multiplying the weekly leftover by 52 is the only way to see what the rhythm is really worth over a year. Be careful with the opposite direction though: if you are paid weekly, four or five months each year contain five paydays. The annual figure is a reliable average, not a promise for any particular month.
What is the flexible spending share telling me?
It shows how much of each week’s income is genuinely discretionary, as opposed to committed to rent, bills and other fixed costs. That share is where every short-term saving has to come from, so it is worth knowing before you promise yourself a cut. If it is already low, cuts have to come from the fixed column — renegotiating a bill, not skipping lunches.
My weekly income changes from week to week. What do I enter?
An average that includes the bad weeks, not the good ones. Add up your last eight to twelve weeks of income and divide by the number of weeks — that is the figure your fixed costs have to survive. Budgeting from a good week is how people end up short in a quiet one, and this calculator has no way to warn you about that.
Terms used here
Short, plain-language definitions of the words this calculator uses.