Meet the Rent Affordability Calculator — How Much Rent
Enter your monthly income, actual monthly expenses and a cost-of-living factor to get a real 'You can safely afford $X rent' figure.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
See it in action
Sample input: Monthly take-home income ($) = 4000; Monthly expenses excl. rent ($) = 1400; Cost-of-living factor = 1
What is the Rent Affordability Calculator — How Much Rent?
The classic rule of thumb is to spend no more than 30% of your gross income on rent, but that number ignores whether you already have heavy monthly expenses. This calculator starts from your monthly take-home income, subtracts your real fixed and variable expenses (excluding rent), and works out how much is genuinely left for rent while keeping a safety margin for savings — then compares that adjusted figure against the standard 30% guideline.
The result is the lower of the two numbers: the 30%-of-income guideline and what your actual budget can support after real expenses, adjusted by a cost-of-living factor for your area. That way a low-expense budget in a cheap area isn't capped unnecessarily, and a high-expense budget isn't told it can afford more than it really can.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Calculated from your actual entered income, not a rounded estimate.
Subtracts what you actually spend before deciding what's left for rent.
Scale the result up or down for your specific city or region.
Shows both the 30%-of-income number and your expense-adjusted number side by side.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Apartment hunters
Get a real number to filter listings by before you fall in love with one you can't afford.
Try it freePeople relocating
Adjust for a new city's cost of living instead of reusing an old budget.
Try it freeRoommates budgeting together
Each person can run their own numbers before agreeing on a shared unit.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This calculator | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Is 30% of income always the right rule?
It's a widely used general guideline, not a law — this calculator also checks your real expenses so a high-expense budget gets a more conservative number and a lean budget isn't under-estimated.
What counts as 'monthly expenses' here?
Everything except rent: food, transportation, insurance, debt payments, subscriptions and other recurring costs.
What does the cost-of-living factor do?
It scales the affordability calculation for your area — use above 1.0 for expensive metro areas and below 1.0 for lower cost-of-living regions.
Should I use gross or net income?
Net (take-home) income gives the most realistic result since that's what actually hits your bank account.
Is this financial advice?
No, it's a transparent formula based on a commonly used affordability guideline and your own numbers, not personalized financial advice.
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Try the Rent Affordability Calculator — How Much Rent now
See the real maximum rent you can safely afford from your income and actual expenses. Free to use.
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