Rent Calculator
Calculate a recommended maximum monthly rent from your gross income and existing debt, using the 30% rule and a 36% debt-adjusted cap.
Calculator Inputs
Sets the currency this calculator's numbers are denominated in. This is presentation only — it does NOT convert your numbers between currencies, it only changes how they're formatted.
Your pre-tax monthly income, before deductions.
Recurring monthly debt payments (auto, cards, student loans), excluding rent.
- Recommended Maximum Rent
- $1,800.00
- 30% of Income
- $1,800.00
- Debt-Adjusted Cap (36% Back-End)
- $2,160.00
- Which Limit Applies
- Standard 30% of income rule
About these results
CalcSpectrum calculators produce automated estimates using established formulas and the specific values you enter. Because real-world outcomes depend on input accuracy, mathematical assumptions, and rounding conventions, please verify critical figures with an appropriately qualified financial, tax, medical, legal, or other professional, as relevant.
Financial Notice: These figures are informational estimates for personal planning only. They do not constitute financial, investment, tax, or legal advice, nor do they represent a lending offer or credit approval. Provider and financial institution figures, rates, fees, and underwriting requirements may differ.
How It's Calculated
Formula
This calculator applies two common financial-literacy conventions for how much rent is affordable, neither of which is a jurisdiction rule or a landlord/lender's actual approval cutoff. The first is the widely cited '30% rule': keep rent at or below 30% of gross monthly income. The second accounts for existing debt: keep total monthly housing plus other debt payments at or below 36% of gross income (the same 36% back-end guideline used in debt-to-income calculations), then subtracts current debt payments to see how much of that 36% budget is left for rent. The recommended maximum rent is whichever of the two figures is lower — existing debt can only push the affordable rent down from the flat 30% figure, never above it.
Worked Examples
Low debt: $6,000/month income, $300/month other debt
- 30% rule: 6,000 × 0.30 = $1,800
- Debt-adjusted cap: 6,000 × 0.36 − 300 = 2,160 − 300 = $1,860
- Recommended max rent: min($1,800, $1,860) = $1,800 — the 30% rule is the binding limit here
Higher debt: $6,000/month income, $1,500/month other debt
- 30% rule: 6,000 × 0.30 = $1,800 (unchanged — debt doesn't affect this figure)
- Debt-adjusted cap: 6,000 × 0.36 − 1,500 = 2,160 − 1,500 = $660
- Recommended max rent: min($1,800, $660) = $660 — existing debt is now the binding limit
Frequently Asked Questions
Why two different rent figures?
The 30% rule alone ignores other debt entirely, so someone with heavy car and credit card payments could still be told they can 'afford' 30% of income in rent, even though total obligations would then be dangerously high. The debt-adjusted cap fixes that by keeping total housing plus debt at or below 36% of income. The recommended figure is always the more conservative (lower) of the two.
What if the debt-adjusted cap is negative?
It's shown as $0, not a negative number — if existing debt payments alone already exceed 36% of income, this method indicates no additional rent fits the 36% guideline at all, which is itself a meaningful signal about the household's current debt load.
Are 30% and 36% official or legally required limits?
No. Both are commonly cited financial-literacy conventions, not government regulations or a specific landlord or lender's real qualification threshold. Actual rental approval and mortgage-lending standards vary and may use different percentages.
Does 'other monthly debt' include existing rent or a mortgage?
No — this field is for debt obligations OTHER than the housing payment being solved for here (auto loans, credit cards, student loans, and similar recurring debts). Don't include a current or prior rent/mortgage payment.