THE NUMORIX GUIDE
How to use the Rent Calculator
Last reviewed September 14, 2026
What this calculator does
The route converts annual income to monthly income and applies each selected income-to-rent ratio: monthly income x 0.
Formula and method
The route converts annual income to monthly income and applies each selected income-to-rent ratio: monthly income x 0.30, 0.40, or 0.50. It also projects annual income by multiplying the initial income by (1 + annualRaise)^year and shows the three corresponding rent ceilings for each year.
Variables and inputs
Enter annual income, monthly debt payments, target ratio of 30%, 40%, or 50%, annual raise, and projection years. Income and debt are dollars; rates are percentages; years controls the displayed income schedule.
Worked example
With $60,000 annual income, monthly income is 60,000 / 12 = $5,000. At the selected 30% ratio, the first-year maximum rent is 5,000 x 0.30 = $1,500. With a 3% raise, year-two income is 60,000 x 1.03 = $61,800 and the 30% rent figure becomes 61,800 / 12 x 0.30 = $1,545.
How to interpret the result
The selected result is a ratio-based rent ceiling, while the schedule shows how that ceiling changes with projected income. It is not a lease approval or a complete affordability budget. Debt can matter to a household even when the route's displayed ratio is based only on income.
Common mistakes to avoid
Check whether the ratio is meant to be a ceiling or a target. Enter annual income rather than monthly income in the annual field. Do not infer that the displayed 50% option leaves enough money for debt, utilities, savings, or irregular costs.
Assumptions and limitations
The monthlyDebt input is accepted by the engine but is not used in the selected rent calculation or schedule. The route models income growth but not rent inflation, utilities, deposits, insurance, location, household size, or landlord screening rules.