Enter your gross monthly income and existing debts to see rent ceilings at three common guidelines, plus whether rent and debts together stay within a healthy range.
The 1969 Brooke Amendment first capped what a public-housing tenant could be charged at 25% of income. The Omnibus Budget Reconciliation Act of 1981 raised that federal standard to 30%, primarily to reduce how much the government needed to subsidize each household — a budget decision, not a discovery about what tenants could comfortably afford. The number spread far beyond public housing into general financial advice and lender screening over the following decades, but it is worth knowing the 30% line was set by Congress balancing a federal budget, not derived from any study of household finances.
At $6,000/month income, the 30% rent figure is $1,800, and the 40% combined ceiling this page checks against is $2,400 — meaning existing debts can run up to exactly $600/month before a warning appears. One dollar more than that, and the combined total crosses 40.0% of gross income. That threshold moves proportionally with income: at half the income, the same ceiling is half the dollar amount, but the same 40% share.
Each 5-percentage-point step is $300/month at this page's $6,000 default — the difference between $1,500, $1,800, and $2,100. A landlord's screening minimum (often 2.5–3× the rent) is a floor for approval, not a ceiling for comfort, so qualifying for the 35% scenario is not the same as it being the wiser choice. For the equivalent question on the buying side rather than renting, the House Affordability Calculator runs the same kind of income-based ceiling against a mortgage payment instead of a rent check.
The 30% rule is a long-standing rule of thumb stating that housing costs — rent, in this case — shouldn't exceed 30% of gross monthly income. It traces back to US federal housing assistance guidelines rather than any hard financial law, so it functions as a useful starting benchmark rather than a rule everyone must strictly follow. This calculator shows it alongside a more conservative 25% ceiling and a more aggressive 35% ceiling so you can see the full range before deciding what fits your situation.
This calculator uses gross (pre-tax) monthly income, matching how the 25/30/35% guidelines and most landlord screening criteria are typically quoted. Since your actual take-home pay is lower than gross income, budgeting against gross income builds in a natural cushion — just keep in mind the percentage of your real spendable (net) income going to rent will be noticeably higher than the percentage shown here.
Rent alone doesn't tell the whole story — car payments, student loans, and credit card minimums all compete for the same income. This calculator adds your existing monthly debts to the 30%-rent scenario and flags it if the combined total climbs above 40% of gross income, a commonly used combined-obligation ceiling similar to the "back-end DTI" limit mortgage lenders apply. See the dedicated Debt-to-Income Ratio Calculator for a deeper breakdown of that ratio on its own.
A landlord's income requirement (often 2.5x to 3x rent, which lines up closely with the 30-35% guidelines used here) is a screening minimum, not a recommendation for your personal budget. If you carry significant debts, have irregular income, or are chasing aggressive savings goals, the more conservative 25% ceiling may leave you in a healthier financial position even if you'd qualify for a higher rent. For a companion view of your full monthly budget rather than just the rent line item, see the Budget Calculator.
Worked example: at $6,000/month gross income with $300/month in existing debts, the three ceilings come to $1,500 (25%), $1,800 (30%), and $2,100 (35%). Checking the 30% scenario against the combined-debt guideline: $1,800 rent + $300 debts = $2,100, which is exactly 35% of gross income — comfortably under the 40% combined ceiling, so no warning appears. If existing debts were higher, say $700/month, the same $1,800 rent would push the combined total to $2,500, or 41.7% of income, and the tool would flag it.
Considering buying instead of renting? See the House Affordability Calculator. Want to map out your full monthly budget, not just the rent line? Try the companion Budget Calculator.