What the ratio tells you
Rent-to-income compares monthly rent and utilities to gross monthly income. A lower ratio usually means more room for the rest of life.
For tenants, it helps avoid becoming house poor. For landlords, it helps identify applications that may need a closer look.
What it does not tell you
It does not know debt payments, childcare, medical costs, household size, local transportation costs, or savings. Treat it like a warning light, not the whole dashboard.
Use it carefully
The goal is not to reduce people to a single number. The goal is to spot whether the rent looks sustainable enough for a healthy tenancy.