Quick answer
Prorated rent = monthly rent ÷ days in the month × days occupied. $1,500 of monthly rent for 12 days of a 30-day month is $600, at a daily rate of $50.
Enter the monthly rent, days in the month and days occupied. The calculator returns the prorated rent and daily rate.
Related tools: Rent Calculator: Maximum rent for a share of monthly income. Net Effective Rent Calculator: Average monthly rent after free-rent concessions. Property Management Fee Calculator: Monthly management fee as a percentage of rent plus any flat fee.
How to use the Prorated Rent Calculator
- Enter monthly rent ($) (above 0).
- Enter days in the month (a whole number, between 28 and 31).
- Enter days occupied (a whole number, 0 or more).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Monthly rent | A number, in $ | > 0 |
| Days in the month | A whole number | ≥ 28, ≤ 31 |
| Days occupied | A whole number | ≥ 0 |
Formula and method
Formula
prorated rent = monthly rent ÷ days in month × days occupied
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
Daily-rate method; some leases use a 30-day or 365-day basis instead.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Monthly rent = 1500; Days in the month = 30; Days occupied = 12.
| Result | Value |
|---|---|
| Prorated rent | $600.00 |
| Daily rate | $50.00 |
Example 2
Inputs: Monthly rent = 1850; Days in the month = 31; Days occupied = 17.
| Result | Value |
|---|---|
| Prorated rent | $1,014.52 |
| Daily rate | $59.68 |
The first line is the headline result (prorated rent). Below it the prorated Rent Calculator lists daily rate, which describe the same case from other angles. IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
Move-in and move-out
Prorating handles partial months: if you move in on the 19th of a 30-day month, you occupy 12 days. The daily rate is $1,500 ÷ 30 = $50. Some leases use a 30-day or 365-day basis instead.
Check the lease
The method is set by the lease or local law. Days occupied cannot exceed the days in the month. The result excludes deposits and fees.
How the result changes with monthly rent
Holding every other input at the first worked example, this table changes only monthly rent. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Monthly rent | Prorated rent | Daily rate |
|---|---|---|
| 750 | $300.00 | $25.00 |
| 1500 | $600.00 | $50.00 |
| 3000 | $1,200.00 | $100.00 |
| 6000 | $2,400.00 | $200.00 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Days occupied: entering "31" shows "Days occupied cannot exceed the days in the month." beside that field and no result.
- Days in the month: entering "27" shows "Days in the month must be at least 28." beside that field and no result.
Choosing between the Prorated Rent Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Rent Calculator](/real-estate/rent-calculator/) | gross monthly income and share of income for rent | Maximum monthly rent |
| [Net Effective Rent Calculator](/real-estate/net-effective-rent-calculator/) | monthly rent, lease term and free months | Net effective rent |
| [Property Management Fee Calculator](/real-estate/property-management-fee-calculator/) | monthly rent and management fee | Management fee per month |
| [Rent vs Buy Calculator](/real-estate/rent-vs-buy-calculator/) | monthly rent, yearly rent increase and home price | Cheaper over the horizon |
| [Rent Split Calculator](/lifestyle/rent-split-calculator/) | total rent and each person's income | Shares |
Background: rental property metrics
Rental property metrics answer different questions. The cap rate is net operating income divided by the purchase price and ignores financing; cash flow is income minus operating expenses minus debt service; cash-on-cash return divides annual cash flow by the cash you actually invested. Rules of thumb such as the 1% rule (monthly rent at least 1% of the price) are quick screens, not decisions.
Check the assumptions behind any result: vacancy, management fees, repairs and taxes. Published benchmark ranges for a good cap rate or return vary between sources.
Assumptions and limitations
- Days occupied cannot exceed days in the month
Estimates only. Taxes, fees and lender or authority rules vary by place and date, so confirm figures with the relevant authority or professional.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for days occupied and days in the month to confirm this.
Frequently asked questions
How do I count the days?
Include the move-in day.
Is it 30 days or the actual days?
Follow your lease: some use the actual number of days in the month, others a flat 30 days; the example uses 30.
Does it include utilities?
Only if part of rent.
What does the Prorated Rent Calculator calculate?
Rent for a partial month. It returns Prorated rent and Daily rate.
What formula does the Prorated Rent Calculator use?
prorated rent = monthly rent ÷ days in month × days occupied. Daily-rate method; some leases use a 30-day or 365-day basis instead.
What do I need to enter in the prorated Rent Calculator?
You enter Monthly rent ($), Days in the month and Days occupied.
How is the result rounded or limited?
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice. Days occupied cannot exceed days in the month.
What is an example of a prorated Rent result?
With monthly rent 1500, days in the month 30 and days occupied 12, the prorated rent is $600.00.
Can I rely on this calculator for a decision?
Estimates only. Taxes, fees and lender or authority rules vary by place and date, so confirm figures with the relevant authority or professional. For this calculator in particular: Days occupied cannot exceed days in the month.
Related calculators
- Rent Calculator — Maximum rent for a share of monthly income.
- Net Effective Rent Calculator — Average monthly rent after free-rent concessions.
- Property Management Fee Calculator — Monthly management fee as a percentage of rent plus any flat fee.
- Rent vs Buy Calculator — Compare the total cost of renting with the net cost of buying over a time horizon.
- Rent Split Calculator — Split rent in proportion to each person's income.
- Mortgage Calculator — Monthly mortgage payment with property tax, insurance and HOA.
Sources
- Standard time-value-of-money relations (e.g. Brealey, Myers & Allen, Principles of Corporate Finance)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.