How to Calculate Prorated Rent: 3 Methods + Free Calculator
How to Calculate Prorated Rent: 3 Methods + Free Calculator
Prorated rent is the amount a tenant owes for a partial month of occupancy — typically at move-in or move-out. Instead of paying a full month's rent, you pay only for the days you actually lived in the unit.
If you move in on March 15th with $1,500/month rent, you shouldn't pay the full $1,500. You should pay for 17 days (March 15–31). The exact amount depends on which calculation method your landlord uses.
Want the math done for you? Use the Free Prorated Rent Calculator →
The 3 Ways to Calculate Prorated Rent
Method 1: Daily Rate Method (Most Common)
Formula:
Monthly Rent ÷ Days in the Month × Days Occupied = Prorated Rent
This is the most common method used by landlords and courts. It accounts for the actual number of days in that specific month (28, 29, 30, or 31 days).
Example: Move-in on March 15
- Monthly rent: $1,500
- Days in March: 31
- Days occupied (March 15–31): 17
$1,500 ÷ 31 × 17 = $822.58
Example: Move-in on February 15 (non-leap year)
- Monthly rent: $1,500
- Days in February: 28
- Days occupied (Feb 15–28): 14
$1,500 ÷ 28 × 14 = $750.00
Method 2: 30-Day Method
Formula:
Monthly Rent ÷ 30 × Days Occupied = Prorated Rent
Some landlords use a flat 30-day divisor regardless of the actual days in the month. This slightly benefits tenants in longer months (31 days) and slightly benefits landlords in shorter months (28–29 days).
Example: Move-in on March 15
- Monthly rent: $1,500
- Days occupied: 17
$1,500 ÷ 30 × 17 = $850.00
vs. the daily rate method result of $822.58 — a $27.42 difference in March.
Method 3: Annual (Daily) Method
Formula:
(Monthly Rent × 12) ÷ 365 × Days Occupied = Prorated Rent
This method calculates a true daily rate based on annual rent. It's less common but produces the most consistent daily rate throughout the year.
Example: Move-in on March 15
- Monthly rent: $1,500 → Annual: $18,000
- Daily rate: $18,000 ÷ 365 = $49.32
- Days occupied: 17
$49.32 × 17 = $838.36
Method Comparison Table
| Method | Formula | March 15 Move-In ($1,500/mo) |
|---|---|---|
| Daily Rate | ÷ days in month × days occupied | $822.58 |
| 30-Day | ÷ 30 × days occupied | $850.00 |
| Annual | × 12 ÷ 365 × days occupied | $838.36 |
Industry standard: The daily rate method (Method 1) is the most widely used and the method recommended by most property management associations.
How to Count Days Occupied
This is where many landlords and tenants disagree. The general rules:
Move-in proration:
- Count the move-in day as Day 1
- Count every day through the last day of the month
- Example: Move in March 15 → Days = 15, 16, 17... 31 = 17 days
Move-out proration:
- Count every day from the 1st through (but sometimes not including) move-out day
- If you vacate March 20: Days = 1, 2... 19 = 19 days (common) or 20 (varies by lease)
- Check your lease — it should specify whether the move-out date is included
Tip: Your lease agreement should specify both the proration method and day-counting rule. If it doesn't, ask your landlord in writing before signing.
Prorated Rent at Move-Out
Move-out proration works the same way — you pay only for the days you occupied the unit that month.
Example: Move out on March 20
- Monthly rent: $1,500
- Days in March: 31
- Days occupied (March 1–19): 19
$1,500 ÷ 31 × 19 = $919.35
If you already paid full March rent, you'd be owed a $580.65 refund.
Quick Reference: Prorated Rent by Move-In Date
Using the daily rate method for a $1,500/month lease in a 31-day month:
| Move-In Date | Days Occupied | Prorated Rent |
|---|---|---|
| March 1 | 31 | $1,500.00 |
| March 5 | 27 | $1,306.45 |
| March 10 | 22 | $1,064.52 |
| March 15 | 17 | $822.58 |
| March 20 | 12 | $580.65 |
| March 25 | 7 | $338.71 |
| March 28 | 4 | $193.55 |
Last Month's Rent and Proration
If you pre-paid last month's rent at move-in and your move-out date is mid-month, you may be owed a prorated refund. How this works:
- You paid $1,500 as "last month's rent" at move-in
- You vacate on March 20 (19 days occupied)
- Prorated rent owed: $919.35
- Refund due: $1,500 – $919.35 = $580.65
Request this refund in writing before your move-out date. Your landlord should return the overpayment within the security deposit return deadline for your state (typically 14–30 days).
State-Specific Proration Rules
Most states do not mandate a specific proration method — the method is governed by your lease. However, a few states have guidance:
| State | Notes |
|---|---|
| California | No statutory method; daily rate most common |
| New York | No statutory method; 30-day method common in NYC |
| Texas | No statutory method; daily rate standard |
| Florida | No statutory method; daily rate standard |
| Illinois | No statutory method; either method acceptable |
If your lease is silent on proration method, ask your landlord in writing which method they use before your first prorated payment.
When Is Prorated Rent Due?
Prorated rent is typically due:
- At move-in: On or before the day you take possession of the unit
- Separate from security deposit: Never combine prorated rent with your security deposit
- Before or with first full month's rent: Many landlords collect prorated rent + first full month's rent + deposit at lease signing
Example lease start: March 15
- Due at signing: Prorated rent (March 15–31) + April's full rent + security deposit
- First regular payment: May 1 (for May)
Common Proration Mistakes
Mistake 1: Paying full rent for a partial month If you moved in mid-month and paid full rent, ask your landlord for a prorated credit. This is your right in most states.
Mistake 2: Not counting correctly Many tenants count wrong by forgetting to include the move-in day itself, or by stopping the count one day early. Always include the move-in date.
Mistake 3: Using the wrong method If your lease specifies "monthly rent divided by 30," don't use the daily rate method — even if it gives you a lower number. Follow the lease method.
Mistake 4: Missing the move-out refund Tenants who paid full last month's rent but vacated mid-month often forget to request the prorated refund. Put the request in writing before you vacate.
Free Prorated Rent Calculator
Calculating proration by hand is error-prone. Use the free calculator to get the exact amount instantly:
Free Prorated Rent Calculator →
Enter:
- Move-in or move-out date
- Monthly rent amount
- Calculation method (daily rate, 30-day, or annual)
The calculator shows the exact prorated amount, days occupied, daily rate, and a breakdown you can save or share as a PDF record.
Frequently Asked Questions
Q: Is landlord required to prorate rent? No federal law requires proration. However, if your lease specifies a start date of the 15th, you generally owe rent only from that date. Most landlords prorate automatically because requiring full rent for a partial month would be difficult to enforce.
Q: What if my landlord won't prorate? If your lease clearly states a mid-month start date, you owe rent only from that date. Paying full rent and then requesting a credit is common. If the landlord refuses, consult your local tenant rights organization.
Q: How does proration work with first and last month's rent? Proration applies to the first partial month only. Last month's rent (if collected at move-in) is typically held at the full monthly rate and applied to your last full or partial month.
Q: Do I have to pay prorated rent and first month's rent? Yes — if you move in mid-month, you typically owe both: the prorated amount for the partial first month AND the first full month's rent for the upcoming month. This is standard practice.
Q: Can I just pay half a month's rent if I move in on the 15th? Only if the 15th is exactly the midpoint of that month. For a 31-day month, the 15th is not the halfway point (day 16 is). Use the daily rate formula or calculator for the precise amount.
Related Tools & Guides
- Free Prorated Rent Calculator — Get your exact prorated amount instantly
- California Prorated Rent Guide — CA-specific rules and examples
- Florida Prorated Rent Guide — FL landlord-tenant rules
- Security Deposit Calculator — Know your state's deposit limits
- Rent Late Fee Calculator — Calculate late fees if rent goes unpaid after the grace period