How does this calculator count move-in days?
Move-in mode includes the entered move-in date and every calendar date through the end of the selected billing month. The boundary date must be inside that month.
US · USDTransparent educational estimate
Prorated Rent Calculator
Compare a single partial billing month's rent under several explicit mathematical conventions. Model either an inclusive move-in period or an inclusive move-out period without selecting a legally correct method or interpreting a lease.
What this baseline models
- Separate inclusive move-in and move-out counts
- Actual-days, 30-day, and annual/365 conventions
- Optional user-entered lease-defined daily rate
- Side-by-side method differences without a recommendation
- Gregorian date math with no timezone conversion
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Compare one partial-month rent period
Rent, event, and calendar assumptions
Enter monthly scheduled rent, one billing month, and an inclusive move-in or move-out date. Add a custom daily rate only when an explicit lease or policy supplies it.
Chargeable days
18
Includes the move-in date
Lowest modeled charge
$1,053.00
Arithmetic low, not a method recommendation
Highest modeled charge
$1,117.24
Arithmetic high, not a method recommendation
Difference across methods
$64.24
Highest minus lowest modeled charge
Proration period detail
The selected event, inclusive calendar count, and days outside the modeled charge. These arithmetic outputs do not determine an amount legally due.
- Mode
- Move-in
- Billing month
- February 2028
- Move-in date
- 2028-02-12 · included
- Calendar days in month
- 29
- Days outside modeled charge
- 11
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Assumption checks
Deterministic checks based only on this scenario's inputs and outputs.
Lease terms and applicable law control the method
DealYield compares mathematical conventions but does not determine which method a lease, policy, or jurisdiction requires.
The modeled methods produce different charges
Compare the amounts with the governing lease language and applicable requirements rather than treating the lowest or highest result as preferred.
Custom daily rate is user supplied
The custom comparison uses the entered daily rate without interpreting its source, scope, rounding rule, or enforceability.
Annual/365 keeps a 365-day divisor
The selected year has 366 calendar days, but the annual/365 comparison still divides annualized rent by 365. The actual-days method continues to use the selected month's calendar length.
Method comparison
Every row uses the same inclusive calendar-day count. Actual-days is a neutral baseline. Full rent minus charge is arithmetic only—not a determined credit, refund, entitlement, or amount due.
Method comparison details
| Method | Daily rate | Chargeable days | Prorated charge | Difference from actual-days | Full rent − charge |
|---|---|---|---|---|---|
| Actual days in month | $62.068966/day | 18 | $1,117.24 | $0.00 | $682.76 |
| 30-day convention | $60.00/day | 18 | $1,080.00 | -$37.24 | $720.00 |
| Annual/365 convention | $59.178082/day | 18 | $1,065.21 | -$52.03 | $734.79 |
| Custom lease daily rate | $58.50/day | 18 | $1,053.00 | -$64.24 | $747.00 |
Formula reference
Every output is explainable
Money is displayed in USD and rates are entered as percentages where applicable. Formula version prorated-rent@1.0.0 stays attached to the result.
Move-in chargeable days
Days in billing month − Move-in day + 1
Counts the entered move-in date through the last calendar day of the selected billing month, including both boundaries.
Move-out chargeable days
Move-out day of month
Counts the first calendar day of the selected billing month through the entered move-out date, including both boundaries.
Actual-days daily rate
Monthly scheduled rent ÷ Actual calendar days in billing month
Uses 28, 29, 30, or 31 as the divisor based on the selected month and Gregorian leap-year rules.
30-day daily rate
Monthly scheduled rent ÷ 30
Uses a fixed 30-day divisor while retaining the same inclusive calendar-day count used by the other methods.
Annual/365 daily rate
(Monthly scheduled rent × 12) ÷ 365
Annualizes the entered monthly amount and divides by a fixed 365 days. The divisor remains 365 in leap years.
Custom lease daily rate
Entered lease-defined daily rate
Uses the optional daily rate exactly as entered. DealYield does not infer, interpret, or validate the governing lease term.
Prorated charge
Daily rate × Chargeable days
Multiplies without intermediate rounding, then rounds the result half-up to cents. A full chargeable month returns the entered monthly rent without proration.
Method comparison
Method charge − Actual-days charge
Uses actual-days only as a neutral comparison baseline. The difference does not identify a preferred, required, or legally correct method.
Example scenario
A leap-year February move-in comparison
The editable example uses $1,800 monthly rent, a February 12, 2028 move-in, and a $58.50 custom daily rate. It counts 18 chargeable days in a 29-day leap-year February; the four modeled charges range from $1,053.00 to $1,117.24.
Open the example in the calculatorMonthly scheduled rent
$1,800.00
Inclusive move-in date
2028-02-12
Chargeable days
18 of 29
Difference across methods
$64.24
FAQ
Common questions
How does move-out mode work?
Move-out mode includes the first day of the billing month through the entered move-out date. Any difference from full monthly rent is an arithmetic reconciliation comparison, not a determined credit, refund, or legal entitlement.
What is different about the supported methods?
Actual-days divides monthly rent by the selected month's calendar length, the 30-day convention uses a fixed divisor of 30, and annual/365 divides twelve months of rent by 365. All three use the same inclusive chargeable-day count.
What should I enter as a custom lease daily rate?
Enter a USD-per-day value only when a lease, written policy, or other governing source explicitly supplies it. DealYield uses that value as entered and does not interpret whether it applies or is enforceable.
Guide, methodology, and related calculators
Read the supporting methodology, then compare this result with another view of income, financing, or project returns. Each calculator uses its own transparent assumptions.