Rent Affordability Calculator — 30% Rule, 3× Gate & 50/30/20

Real-world use cases

• Set a hard rent ceiling before you start touring apartments

  Before you open a single listing, plug in your gross income, your car payment, and roughly what you spend on utilities and groceries. The recommended number is the most conservative of the three rules, so you walk into every showing already knowing the line you won't cross. It stops the slow creep where each "just $150 more" apartment looks reasonable in isolation but adds up to a lease you resent six months in.

• Check whether a listing will even accept your application

  You found a $2,200 place and your gross income is $6,000. The landlord 3× gate wants income ≥ 3 × rent = $6,600, so you're under the bar and the application will likely bounce — before you pay a $50 screening fee. Read the "Landlord 3× gate" figure first; if your income is below 3× the asking rent, either find a co-signer, look lower, or skip the application entirely.

• Budget rent honestly when you carry student or card debt

  The 30% rule says a $5,000 earner can spend $1,500 on rent. But with $600/month of student loans and credit-card minimums, the 50/30/20 number drops to something far lower — and that's the figure that keeps you from skipping a debt payment to make rent. Enter your real monthly debt and trust the debt-aware number over the blunt 30%.

• Figure out the raise or roommate you need for a specific place

  Switch to reverse mode, type the rent you actually want, and read back the gross income that clears every gate. If the number is $8,400 and you make $7,000, you now know the exact gap — a $1,400/mo raise, a roommate covering that share, or a cheaper unit. Concrete targets beat vague "I should earn more" feelings.

• Sanity-check a relocation offer against a new city's rents

  A job offer in a pricier metro looks great until you map the salary onto local rent. Convert the offered salary to a monthly figure, enter your debts, and compare the recommended rent here against what 1-bedrooms actually list for there. If the affordable ceiling sits below the market median, the raise isn't really a raise once housing eats it.

Common pitfalls

• Budgeting rent off gross income when you actually pay it out of net. The 30% rule uses gross because applications do, but your bank account only ever sees take-home pay. Always cross-check against the 50/30/20 figure, which is computed from net minus your debts.

• Forgetting the landlord 3× gate and falling in love with a place your application can't clear. Even if your personal budget allows $2,200, a landlord requiring 3× income will reject you at $6,000 gross. Check the 3× number before you tour or pay a screening fee.

• Leaving existing debt out of the calculation. The blunt 30% rule ignores your car loan and credit-card minimums entirely. Enter them so the 50/30/20 ceiling reflects what you can sustain without skipping a payment somewhere else.

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