The 30% rule is a widely cited personal-finance guideline suggesting that rent — or total housing costs — shouldn't take up more than about 30% of your gross (pre-tax) monthly income. It isn't a law and no one enforces it, but it's a useful, well-known benchmark: it's the same threshold the U.S. Department of Housing and Urban Development (HUD) uses to define a "cost-burdened" household, and it's a common starting point in personal budgets, mortgage pre-qualification, and rental applications. The calculator above works in both directions: enter your income to get a recommended max rent, or enter a rent to see the income you'd want to comfortably afford it.
How do you calculate the rent you can afford?
- Formula: Max rent = Gross monthly income × 0.30
- Example: $60,000/year → $5,000/month → $1,500/month recommended max rent
- Annual view: $1,500/month × 12 = $18,000/year spent on rent
How much income do you need for a specific rent?
25% vs. 30% vs. 35-40%: which target should you use?
The 30% figure is a starting point, not a strict ceiling. A 25% target is more conservative and leaves more room for savings, debt payments, and emergencies — useful if you have student loans, a car payment, or want to save aggressively. A 35-40% target is common in high-cost metro areas (parts of coastal California, New York City, and similar markets) where median rents simply outpace what 30% of a typical income covers; it isn't wrong, but it does leave a thinner financial cushion and falls into the range HUD classifies as cost-burdened. The right number depends on your other expenses, job stability, and how much you value flexibility versus a bigger space or better location.
The 2.5x-3x rent income rule landlords use
It helps to see how this lines up with the 30% rule mathematically: requiring income at 3x rent is the same as saying rent can be up to about 33% of income (1 ÷ 3 ≈ 33%), while requiring 2.5x rent allows rent up to about 40% of income (1 ÷ 2.5 = 40%). In other words, a landlord's 3x-rent screening is usually a little easier to clear than the more conservative 30% budgeting guideline — so if your income comfortably meets the 30% rule, you'll typically clear standard income screenings too.