Prorated Rent Calculator
Landlords sometimes "forget" to prorate and charge you a full month for 16 days. Your prorated rent is (monthly rent / days in month) x days occupied. This calculator handles both the standard 30-day method and actual calendar day method — and February prorations can differ by $25-50 between the two, so pick the one that favors you.
Prorated rent is the exact amount you owe for a partial month when moving in or out mid-month. Divide your monthly rent by the number of days in the month (or use the standard 30-day method), then multiply by the days you'll occupy the unit. Enter your rent and dates below for an instant calculation with both methods compared.
Rent Details
Divides rent by 30 days regardless of month length. Most common method.
How This Calculator Works
Enter Your Details
Fill in amounts, people, and preferences. Takes under 30 seconds.
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See an instant breakdown with data-driven calculations and Fairness Scores.
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Frequently Asked Questions
How do you calculate prorated rent?
Prorated rent = (Monthly Rent ÷ Number of Days in Period) × Number of Days Occupied. For a $1,500 rent moving in on the 15th of a 30-day month, that's ($1,500 ÷ 30) × 16 = $800. Our calculator offers both 30-day standard and actual calendar day methods.
What is the difference between 30-day and actual day proration?
The 30-day method always divides by 30 regardless of month length — simpler but less precise. The actual day method divides by the real number of days (28-31), giving the mathematically exact amount. February prorations can differ by $25-50 between methods.
Should I prorate rent for a partial first month?
Yes — most leases require prorated rent for the first partial month plus the full next month's rent. Some landlords charge the full month regardless. Our calculator shows both scenarios so you can negotiate.
How is prorated rent calculated for move-out?
Move-out proration works the same way: you pay for the days you occupied the unit. If your lease ends mid-month, you owe (Monthly Rent ÷ Days in Month) × Days Occupied. Many leases require 30-day notice for move-out proration.
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