Prorated Rent Calculator

Prorated rent covers only the days a tenant actually occupies a unit during a partial billing period — most often the month a tenant moves in or out. Divide the monthly (or annual) rent down to a daily rate, then multiply by the number of billable days. The three common methods differ only in how that daily rate is found: actual days in the specific month, a flat 30-day month, or annual rent divided by 365.

Worked example: rent is $1,800 a month and a tenant moves in on June 10. June has 30 days, so under the actual-days method the daily rate is $1,800 ÷ 30 = $60. With the move-in date counted, the tenant owes rent for 21 days (June 10 through June 30): 21 × $60 = $1,260 for that first partial month.

• Which proration method the lease specifies — actual days, 30-day, or 365-day
• Whether the move-in date counts as a billable day (it almost always does)
• Whether the move-out date counts as a billable day — this varies by lease
• The exact number of days in the relevant month, if using the actual-days method

• Switching methods mid-lease instead of using whatever the lease specifies
• Forgetting to decide explicitly whether the move-out day is billable
• Using a 30-day divisor in a 31-day month without checking which method the agreement requires
• Rounding the daily rate too early and compounding the error across many billable days