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Rent Calculator Prorated

Work out prorated rent for a move-in or move-out date with all four common methods (actual days, 30-day month, yearly ÷ 365 and leap year), then check how much rent your income supports.

Updated November 4, 2026. Free, no sign-up; everything runs in your browser and nothing you type is stored.

Rent calculator prorated

Monthly rent ($)Date

Prorated rent (actual days)

–

–Days charged

Budget calculator: how much rent can I afford?

Gross yearly income ($)Take-home pay per month ($)

–Rent at 30% of gross

–Max rent landlords' 40× rule allows

–50/30/20 budget

How to prorate rent

Prorated rent is the partial rent for the days you actually live in the home in your first or last month. The lease decides the method; if it doesn't say, the actual-days method is the most common:

Actual days: monthly rent ÷ days in that month × days occupied. Moving in November 18 at $1,800: $1,800 ÷ 30 × 13 = $780.00.
Banker's month: monthly rent ÷ 30 × days, regardless of month length.
Yearly ÷ 365: (rent × 12) ÷ 365 × days, same daily rate all year ($59.18 at $1,800).
Yearly ÷ days in the year: like the previous one but 366 in leap years (2028).

Move-in counts the move-in day; move-out counts days up to and including the last day you're responsible for. Some landlords skip proration and start rent on the 1st; ask before you sign.

Budget calculator: the 30% and 50/30/20 rules

A common guideline keeps rent at or under 30% of gross income: $72,000 a year allows about $1,800 a month. Many landlords require income of 40 times the monthly rent ($72,000 → $1,800). The 50/30/20 budget splits take-home pay into 50% needs (rent, utilities, groceries, minimum debt payments), 30% wants and 20% savings and extra debt payments.

Common questions

How do I calculate prorated rent?

Monthly rent ÷ days in the month × days you occupy it. $1,800 for 13 days in November is $780.

Which proration method is fairest?

Yearly rent ÷ 365 gives the same daily rate every month; actual days is the most common.

Do I pay rent for my move-in day?

Yes, the move-in day is usually counted.

How much rent can I afford?

About 30% of gross income: $72,000 a year → about $1,800 a month.

What is the 40× rent rule?

Landlords often require annual income of at least 40 times the monthly rent.

Sources

General information, not financial, tax or legal advice. Check important numbers with the official source before acting on them.