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The deposit math nobody teaches you.
Landlords, budgeting rules, and your own bank account all answer "how much rent can I afford" differently. This calculator runs both classic guardrails — the 30%-of-take-home cap and the 50/30/20 needs bucket — takes the stricter one, then prices the upfront hit: first month, deposit, and fees.
New grads use it before apartment hunting to get one honest rent ceiling instead of three conflicting rules of thumb — and to see whether their savings survive signing day. Parents send it to kids to make the deposit math concrete before co-signing anything.
Originally it was 30% of gross income (the old HUD guideline), but on a first salary with student loans, 30% of take-home is the safer read. This calculator uses take-home and cross-checks against the 50/30/20 budget so rent cannot crowd out food, transport, and minimum payments.
Plan on first month plus a security deposit equal to one month, plus $100–$200 in application and admin fees — roughly 2.1× monthly rent before movers, furniture, or utility deposits. Many landlords also require proof you earn 3× the rent monthly, which is its own affordability filter.
Then the honest answers are roommates (splitting a 2BR usually beats a studio by 25–35% per person), a longer commute to a cheaper area, or a few months at home stacking the move-in fund. Signing a lease the math does not support is how the first credit-card spiral starts.