Fair Market Rent Calculator

Getting Approved Is Not the Same as Affording It

The 30% rule above answers "what can I genuinely afford long-term." A different question, "what will a landlord approve me for," usually has a higher answer. Most property managers and screening services use an income-verification threshold instead of the 30% guideline, most commonly requiring gross monthly income to be at least 3 times the rent. Because dividing income by 3 is a smaller divisor than the 30% rule's effective annual-income ÷ 40, the 3x screening standard always clears you for a higher rent than the 30% rule calls affordable, the two numbers update live above as you adjust the calculator.

That gap matters because passing a landlord's screening check doesn't account for the rest of a real budget, student loans, a car payment, childcare, or a savings goal all compete with rent for the same paycheck. A renter who qualifies under the 3x rule but budgets to the 30% figure instead typically has more room to absorb an unexpected expense without becoming rent-burdened.

A related shorthand some landlords use is the "40x rent" rule: annual income should be at least 40 times the monthly rent. That is not a third, stricter standard, it is the same math as the 30% rule stated a different way (30% of annual income ÷ 12 months is algebraically identical to annual income ÷ 40), so a renter who clears the 30% guideline automatically clears a landlord's 40x income check too.

How the PlainRent Calculator Works

This calculator is an educational tool. It takes the inputs you provide, applies a documented formula, and shows the result along with the intermediate steps where those steps are useful for understanding. The formula is published on the methodology page so you can verify it, reproduce it on paper, or implement it yourself. We do not use the calculator to collect personal data, inputs are processed client-side or, when server-side, are not associated with any account or profile.

When the Calculator Is Reliable

The calculator is most accurate when the inputs you enter reflect your actual situation and when the formula we use matches the regulatory or industry standard you are trying to approximate. It is less reliable when your situation contains a non-standard factor, an exception, a waiver, a grandfathered term, or a jurisdiction-specific variant, that the public formula does not express. When in doubt, treat the calculator's output as an order-of-magnitude estimate, not a binding number. For legal, medical, financial, tax, or safety decisions, verify with a licensed professional.

What We Do Not Do

We do not tune calculator outputs for commercial reasons, do not shade them upward or downward to flatter a sponsor, and do not run A/B tests on the formula to improve engagement at the cost of accuracy. When we update the formula, for example, to reflect a new regulatory threshold or a new reference rate, we publish the change on the methodology page along with the effective date, so that anyone citing an earlier calculation can still find the prior formula.

Privacy and Your Inputs

By default, calculator inputs are processed in your browser and never leave the device. A small number of calculators require a server round-trip (for example, to look up a rate from a public dataset); those requests are logged only in the same aggregate fashion as any other page view. We do not build a profile from calculator usage, do not share inputs with advertisers, and do not retain inputs across sessions. If you would like your interaction logs disregarded entirely, browse privately or use a tracker-blocker, we respect both.