Quick answer
A common guide caps rent at about 30% of gross monthly income. On $5,000 a month, the maximum rent is $1,500, leaving $3,500 for other spending.
Enter gross monthly income and the share you are willing to spend on rent. The calculator returns the maximum rent and what remains.
Related tools: Prorated Rent Calculator: Rent for a partial month. Net Effective Rent Calculator: Average monthly rent after free-rent concessions. Rent vs Buy Calculator: Compare the total cost of renting with the net cost of buying over a time horizon.
How to use the Rent Calculator
- Enter gross monthly income ($) (above 0).
- Enter share of income for rent (%) (between 0 and 100). It starts at 30.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Gross monthly income | A number, in $ | > 0 |
| Share of income for rent | A number, in % | > 0, ≤ 100, starts at 30 |
Formula and method
Formula
maximum rent = income × share ÷ 100
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
30% is a common guideline and is editable; it is not a lending rule.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Gross monthly income = 5000; Share of income for rent = 30.
| Result | Value |
|---|---|
| Maximum monthly rent | $1,500.00 |
| Left for other spending | $3,500.00 |
Example 2
Inputs: Gross monthly income = 3200; Share of income for rent = 35.
| Result | Value |
|---|---|
| Maximum monthly rent | $1,120.00 |
| Left for other spending | $2,080.00 |
The first line is the headline result (maximum monthly rent). Below it the rent Calculator lists left for other spending, which describe the same case from other angles. IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
The 30% rule
The guideline comes from US housing affordability measures: households spending over 30% of income on housing are considered cost-burdened. Many landlords require income of 2.5 to 3 times the rent.
Adjusting
The share is an editable guideline. High-cost cities may need 40%, and people with debts may want less. Landlord checks use gross income, but you pay from take-home pay, so budget with net income too.
How the result changes with gross monthly income
Holding every other input at the first worked example, this table changes only gross monthly income. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Gross monthly income | Maximum monthly rent | Left for other spending |
|---|---|---|
| 2500 | $750.00 | $1,750.00 |
| 5000 | $1,500.00 | $3,500.00 |
| 10000 | $3,000.00 | $7,000.00 |
| 20000 | $6,000.00 | $14,000.00 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Gross monthly income: entering "0" shows "Gross monthly income must be greater than 0." beside that field and no result.
- Share of income for rent: entering "0" shows "Share of income for rent must be greater than 0." beside that field and no result.
Choosing between the Rent Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Prorated Rent Calculator](/real-estate/prorated-rent/) | monthly rent, days in the month and days occupied | Prorated rent |
| [Net Effective Rent Calculator](/real-estate/net-effective-rent-calculator/) | monthly rent, lease term and free months | Net effective rent |
| [Rent vs Buy Calculator](/real-estate/rent-vs-buy-calculator/) | monthly rent, yearly rent increase and home price | Cheaper over the horizon |
| [Property Management Fee Calculator](/real-estate/property-management-fee-calculator/) | monthly rent and management fee | Management fee per month |
| [Rent Split Calculator](/lifestyle/rent-split-calculator/) | total rent and each person's income | Shares |
Background: rental property metrics
Rental property metrics answer different questions. The cap rate is net operating income divided by the purchase price and ignores financing; cash flow is income minus operating expenses minus debt service; cash-on-cash return divides annual cash flow by the cash you actually invested. Rules of thumb such as the 1% rule (monthly rent at least 1% of the price) are quick screens, not decisions.
Check the assumptions behind any result: vacancy, management fees, repairs and taxes. Published benchmark ranges for a good cap rate or return vary between sources.
Assumptions and limitations
- The share is an editable guideline
Estimates only. Taxes, fees and lender or authority rules vary by place and date, so confirm figures with the relevant authority or professional.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for gross monthly income and share of income for rent to confirm this.
Frequently asked questions
What income do I need for $1,500 rent?
About $4,500 to $5,000 a month.
Should utilities count?
Include them in your housing budget.
Is 30% mandatory?
No. 30% is a budgeting guideline, and you can change the share to 25%, 35% or whatever fits your finances.
What does the Rent Calculator calculate?
Maximum rent for a share of monthly income. It returns Maximum monthly rent and Left for other spending.
What formula does the Rent Calculator use?
maximum rent = income × share ÷ 100. 30% is a common guideline and is editable; it is not a lending rule.
What do I need to enter in the rent Calculator?
You enter Gross monthly income ($) and Share of income for rent (%).
How is the result rounded or limited?
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice. The share is an editable guideline.
What is an example of a rent result?
With gross monthly income 5000 and share of income for rent 30, the maximum monthly rent is $1,500.00.
Can I rely on this calculator for a decision?
Estimates only. Taxes, fees and lender or authority rules vary by place and date, so confirm figures with the relevant authority or professional. For this calculator in particular: The share is an editable guideline.
Related calculators
- Prorated Rent Calculator — Rent for a partial month.
- Net Effective Rent Calculator — Average monthly rent after free-rent concessions.
- Rent vs Buy Calculator — Compare the total cost of renting with the net cost of buying over a time horizon.
- Property Management Fee Calculator — Monthly management fee as a percentage of rent plus any flat fee.
- Rent Split Calculator — Split rent in proportion to each person's income.
- Mortgage Calculator — Monthly mortgage payment with property tax, insurance and HOA.
Sources
- Standard time-value-of-money relations (e.g. Brealey, Myers & Allen, Principles of Corporate Finance)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.