How is prorated rent calculated?

This calculator multiplies a daily rate by actual occupied days. It compares monthly rent divided by calendar days in the month, monthly rent divided by 30, and annual rent divided by 365. The 30-day comparison is a fixed divisor, not a full 30/360 calendar convention; the annualized comparison keeps 365 even in leap years.

Does move-in day count as a day of prorated rent?

This calculator includes the selected move-in day or move-out day as one occupied day. That is a calculation assumption. The lease, agreed possession dates, and applicable local law determine which days are actually chargeable.

Which prorated rent method should I use?

Use the method required by applicable law and the valid terms of your lease. This tool compares arithmetic and does not choose the legally required method or establish whether proration is available.

Prorated Rent Calculator | 3-Way Comparison: Exact Days, 30-Day & Yearly 365

Understanding the 3 Prorated Rent Calculation Methods

These formulas compare arithmetic; they do not establish a right to prorated rent. Check the applicable local law and valid lease terms for the method, notice requirements, and chargeable dates.

Methodology reviewed September 12, 2026. The 30-day option uses actual occupied days and is not a full 30/360 convention. The annualized option always divides by 365, including leap years. Neither option is capped at monthly rent, so a full 31-day month may produce a higher figure. That difference is not an automatic right to charge more.

Method	Daily Rate Formula	Total Rent Formula	Assumption
1. Exact Days in Month	Monthly Rent ÷ Days in Month (28–31)	Daily Rate × Days Occupied	Uses the actual calendar month length
2. Fixed 30-Day Divisor	Monthly Rent ÷ 30	Daily Rate × Days Occupied	Divides by 30; multiplies by actual occupied days
3. 365-Day Annualized	(Monthly Rent × 12) ÷ 365	Daily Rate × Days Occupied	Uses 365 even in leap years

Date Counting and Scope

01. MOVE-IN DAY IS INCLUDED

Inclusive Move-In Assumption

This tool includes the selected move-in day. Moving in on the 15th of a 30-day month gives (30 - 15 + 1) = 16 occupied days. Actual chargeable dates depend on the agreement and local law.

02. MOVE-OUT DAY IS INCLUDED

Inclusive Move-Out Assumption

This tool includes the selected move-out date. Moving out on the 15th gives 15 occupied days in that month. It does not decide when possession legally ends.

03. CHECK THE WRITTEN LEASE FIRST

Lease Terms and Local Law

A lease may specify a calculation method, but applicable law can limit or override lease terms. This comparison does not evaluate whether a clause is enforceable.

04. MONTH-LENGTH VARIATION

28 vs 30 vs 31 Day Variance

In February (28 days), the daily rate is highest under the Exact Days method, whereas in 31-day months (e.g., January, March, July), Exact Days produces the lowest daily rate.

Frequently Asked Questions

When is prorated rent usually due upon moving in?

The payment date depends on the lease, the agreement with the landlord, and applicable law. This calculator estimates amounts only; it does not set a payment deadline.

Can a landlord refuse to prorate rent for mid-month move-outs?

There is no answer that applies to every tenancy. Notice, lease termination, any agreement to prorate, and local law can affect the amount due. The calculated amounts do not determine your entitlement or remaining liability.