Rent Calculator

What is rent affordability?

Rent affordability is the highest monthly rent you can pay while still covering your other obligations and finishing each month with money left over. It depends on three things: what you take home, what you are already committed to paying, and how much you spend on ordinary living costs.

A budget that works on paper in an average month can fail in a bad one. A medical bill, a car repair or a drop in hours can push a tight budget into the red. That is why this tool gives three rent figures instead of one: the further you move toward the high end, the less room you keep for surprises.

How the calculator works

You provide up to three amounts, each of which can be entered per month or per year. The calculator turns every figure into a monthly one (yearly amounts are divided by 12) and then works in two steps.

1. Disposable income = after-tax income − recurring debt payments.
2. If you entered regular expenses, subtract them as well, then take a share of what remains. If you left expenses blank (or at zero), take a smaller share of the disposable income instead, because the tool has to assume that ordinary living costs will use up a good part of it.

Use take-home pay for the income field, not the salary before tax. Recurring debt means repayments such as credit cards, car loans and student loans. Regular expenses covers food, insurance, fuel, phone, utilities and similar costs.

The three risk levels

The shares applied to your remaining money depend on whether you gave an expenses figure:

Risk rises with the share because less cash is left over for irregular costs and savings. If you can enter your real expenses, do so: the result will then reflect your situation instead of a generic assumption.

Worked examples

With expenses. Suppose your take-home pay is $4,200 a month, you repay $400 a month on a car loan, and your regular expenses come to $1,700.

• Money left after debt and expenses: 4,200 − 400 − 1,700 = $2,100.
• Low risk rent: 70% × 2,100 = $1,470.
• Medium risk rent: 80% × 2,100 = $1,680.
• High risk rent: 90% × 2,100 = $1,890.

Without expenses. With the same income and loan but nothing entered for expenses, the base is 4,200 − 400 = $3,800, and the shares are 15%, 25% and 35%: $570, $950 and $1,330. The figures are much lower because the tool no longer knows your spending and plays safe.

Yearly figures. An after-tax income of $66,000 a year, $3,600 a year of debt and $18,000 a year of expenses is $5,500, $300 and $1,500 a month. That leaves $3,700 and gives rents of $2,590, $2,960 and $3,330.

Example scenarios

The table shows the three rent levels for three monthly budgets, with expenses entered.

What a negative result means

If your debt payments, or your debt and expenses together, exceed your income, the calculator reports a negative rent. That is a signal rather than a bug: on the figures you entered there is nothing left to put toward housing. Recheck the amounts, or look at ways to lower your recurring costs or raise your income before committing to a lease.

Costs beyond the rent itself

The advertised rent is only part of what a home costs. Before settling on a figure, add the following to your regular expenses so the result stays realistic:

• Location: commuting costs, parking, and how far you are from shops, school and activities.
• Utilities and services: electricity, gas, water, internet and renter's insurance, especially when they are not included in the rent.
• Size and layout: a larger place usually costs more to heat and cool, while one with no room to work from home may cost you in other ways.
• One-off costs: the security deposit, application fees, pet deposits, moving costs and furniture for an unfurnished unit.

How this compares with the 30% rule

A widely quoted guideline says rent should stay at or below about 30% of gross (pre-tax) income. It is easy to remember but ignores debts and spending. This calculator starts from take-home pay and your own commitments, so it can give a lower or a higher figure than the rule depending on your circumstances. Use both as a sanity check, not as a guarantee.

To work out a share yourself, the percentage calculator gives you percent-of-a-number quickly, and the salary to hourly calculator helps when your income is quoted in a different period.

This is a simple planning tool. Results are estimates for general information and are not financial advice; consult a qualified professional before signing a lease. See our disclaimer.