Free Rent Proration Calculator

Calculate exactly what you owe for a partial month — instantly.

✓ Free, no sign-up ✓ Actual days in month ✓ Instant results ✓ Mobile friendly
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Optional — add deposits and fees to get your Total Due at Move-In:

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Enter your monthly rent and move-in date above, then click Calculate.

What is Rent Proration?

Rent proration is the process of calculating a partial month's rent when a tenant moves in or out on a day other than the first of the month. Instead of charging a full month, the rent is divided by the number of days in that month and multiplied by the days the tenant actually occupies the unit.

It's one of the most common calculations in property management — and one of the easiest to get wrong when done by hand.

How is Prorated Rent Calculated?

The formula is straightforward:

Daily Rate = Monthly Rent ÷ Days in Month
Prorated Rent = Daily Rate × Days Occupied

For example, if rent is $1,500 and a tenant moves in on the 10th of a 30-day month, they owe 21 days × $50/day = $1,050. Our calculator handles the math instantly for any move-in date.

When Do You Need a Proration Calculator?

Tenant moves in mid-month and owes a partial first month's rent
Calculating total move-in costs including deposits and fees
Move-out refund for a tenant who vacates before month end
Lease start or end dates that don't align with billing cycles

More Than Just Rent Proration

ProrateCalculator.com is built for property management professionals who need more than a basic calculator. Create a free account to unlock all tools.

Move-In Worksheet

Full move-in breakdown including deposits, fees, and incentives.

Business Move-In

Branded PDF summaries for senior living communities.

Team Accounts

Invite your team, share worksheets, assign roles.

Salary Tools

Salary proration and hourly-to-annual conversion.

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