Prorated Rent Calculator
Calculate your prorated rent for a partial month, see total rent for an entire tenancy with move-in and move-out proration, or compare three proration methods side by side. Works with any currency.
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How to Use This Calculator
Tab "Prorated Amount"
Enter your monthly rent and move-in date. The calculator computes your prorated rent for the partial month using the Calendar Days method (actual days in that month). You see the daily rate, remaining days, and exact prorated amount.
Tab "Move-In/Move-Out"
Enter your monthly rent, move-in date, and move-out date. The calculator breaks down your total rent into three parts: prorated first month, full months at the standard rate, and prorated last month. Use this to see exactly how much an entire tenancy will cost.
Tab "Method Comparison"
Enter your monthly rent and move-in date to compare three proration methods side by side: Calendar Days, Banker's Month (divide by 30), and Daily Rate (rent ÷ 30). See which method favors the tenant and which favors the landlord for your specific move-in month.
The Formulas
Prorated Rent = Monthly Rent × (Remaining Days / Days in Month)
Banker's Month method:
Prorated Rent = Monthly Rent × (Remaining Days / 30)
Daily Rate method:
Daily Rate = Monthly Rent / 30
Prorated Rent = Daily Rate × Remaining Days
Remaining days:
Remaining Days = Days in Month − Move-in Day + 1
Total tenancy rent:
Total = Prorated First Month + (Full Months × Rent) + Prorated Last Month
All calculations are pre-tax and assume rent is due for the move-in day and through the move-out day. Actual proration may vary based on lease terms.
Worked Examples
Example 1 — Calendar Days: $2,000 rent, move in March 15
You sign a lease for $2,000/month and move in on March 15. March has 31 days, and you occupy from March 15 through March 31 — that's 17 days.
Using the Calendar Days method, you owe $1,096.77 for your first partial month. This is the most widely used method in residential leases.
Example 2 — Banker's Month (30-day) method: same scenario
Same $2,000 rent, same March 15 move-in, but now using the 30-day (Banker's Month) method. The denominator is always 30 instead of the actual 31 days in March.
The 30-day method costs $36.56 more than Calendar Days in a 31-day month. In months with fewer than 30 days (February), the opposite is true — Calendar Days would cost more.
Example 3 — Full tenancy: March 15 to August 10 at $2,000/mo
You move in March 15 and move out August 10. The calculator breaks this into prorated first month, full months, and prorated last month.
Your total rent from March 15 to August 10 is $9,741.94 — about $258 less than 5 full months would be. The savings come from prorating the two partial months.
Understanding Prorated Rent
When is rent prorated?
Rent is prorated whenever you don't occupy a rental unit for the entire month. The most common situations are:
- Move-in mid-month: Your lease starts on a day other than the 1st.
- Move-out mid-month: Your lease ends before the last day of the month.
- Early termination: You break the lease and vacate before the end of the month.
- Rent changes mid-month: A rent increase takes effect on a day other than the 1st.
Which method should I use?
Check your lease first — it may specify the proration method. If not, Calendar Days is the default in most residential leases. The 30-day (Banker's Month) method is more common in commercial leases. The difference between methods is usually small (under $50 on typical rents), but it's worth knowing which applies to you.
Tips for tenants
- Always get the prorated amount in writing before signing.
- If your landlord uses the 30-day method in a 31-day month, you pay slightly more. Negotiate for Calendar Days.
- Moving in on the 1st avoids proration entirely.
- Keep records of your move-in and move-out dates with photos and written confirmation.
Frequently Asked Questions
Is prorated rent required by law?
In most US states and many other jurisdictions, landlords are required to prorate rent when a tenant moves in or out mid-month. However, the specific rules vary by location. Some leases may specify that rent is not prorated, which could be enforceable depending on local laws. Always check your local tenant rights and your lease agreement.
Can I negotiate the proration method?
Yes. Before signing the lease, you can ask the landlord to use the Calendar Days method (which is the most standard). This matters most in months with 31 days, where the 30-day method results in a slightly higher prorated amount. The difference is usually small, but it's a reasonable negotiation point.
Does prorated rent apply to the deposit too?
No. Security deposits are typically a fixed amount (e.g., one month's rent or a set dollar amount) and are not prorated based on move-in date. Prorating only applies to the rent payment for partial months.
What if I move out on the last day of the month?
If you move out on the last day of the month, you owe the full month's rent — no proration needed. Proration only applies when you don't occupy the unit for the entire month.