How much rent is due for a partial month? Enter the monthly base rent, the year and month, and the first and last days you are charged for. This prorated rent calculator shows three common daily-rate methods side by side. The main limit: your lease and any state or local rules decide which method, if any, applies.
Each method multiplies the included days by a daily rate. The daily rate is the monthly rent divided by the actual days in that month, divided by 30, or multiplied by 12 and divided by 365. The results are estimates to check against your agreement, not an amount you are automatically entitled to pay.
Prorated rent calculator
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How do you count the days for prorated rent?
Enter a numeric calendar year and month, then the first and last included day within that same month. Both the start day and the end day count, so included days = last day − first day + 1.
For April 16 through April 30, that is 30 − 16 + 1 = 15 days. Trulia’s renter guide counts the same way: moving in on June 20 means paying for 11 days of June.
The tool rejects dates that do not exist, such as April 31, or February 29 in a non-leap year. It cannot calculate a span that crosses into the next month. If your agreement calls for it, calculate each month separately.
What does a hypothetical April move-in cost under each method?
Inputs. Hypothetical example: $1,500 monthly base rent, charged from April 16 through April 30, 2026. April has 30 calendar days, so there are 15 included days.
Formula. Actual month: $1,500 ÷ 30 × 15. Flat 30: $1,500 ÷ 30 × 15. Annual 365: $1,500 × 12 ÷ 365 × 15. Daily rates are not rounded before multiplying; only the final total is rounded to cents.
| Basis | Daily-rate formula | Partial-month estimate |
|---|---|---|
| Actual month (30 days) | $1,500 ÷ 30 | $750.00 |
| Flat 30 days | $1,500 ÷ 30 | $750.00 |
| Annual 365 days | $1,500 × 12 ÷ 365 | $739.73 |
Result. The actual-month and flat-30 methods both give $750.00 because April happens to have 30 days. The annual-365 method gives $739.73, about $10 less.
What to check. Ask which method the landlord uses before you pay. In a 31-day month or in February, all three methods can give different answers.
Why do the three daily rates give different answers?
Because each one assumes a different month length. Consider a second hypothetical case: $1,450 monthly rent for February 10–29, 2028. Since 2028 is a leap year, February has 29 days and the range contains 20 days.
- Actual month: $1,450 ÷ 29 × 20 = $1,000.00
- Flat 30: $1,450 ÷ 30 × 20 = $966.67
- Annual 365: $1,450 × 12 ÷ 365 × 20 = $953.42
Short months make the actual-month method the most expensive per day. Long months do the opposite, so no single method is always cheaper for a tenant.
The methods need not agree even for a whole month. With $1,500 rent and all 31 days of January included, actual month gives $1,500, flat 30 gives $1,550 and annual 365 gives $1,528.77.
The calculator does not quietly cap results at the monthly rent. That is a prompt to check the agreement and the actual billing method, not a claim that a landlord may charge more than a full month’s rent.
Which method does your lease use?
Look at the lease first. Trulia’s renter guide notes that leases do not always spell out the proration method, and suggests asking the landlord if it is unclear. It also says there are no nationwide renter rights on prorated rent, though state and local landlord-tenant laws may apply.
The Consumer.gov sample rental agreement shows that rent amount, due date and deposit are separate contract terms. It is a teaching sample, not a template that sets your rights.
24 CFR § 966.4 covers public-housing leases and requires the lease to state the initial tenant rent. It is not a proration formula for private rentals. Trulia’s guide describes the actual-month, 30-day and annual methods as alternatives; its examples are consumer guidance, not law.
If you think a state or local rule applies to your situation, check with your state or local housing agency or a tenant legal-aid office rather than relying on a calculator.
Also confirm whether the date you entered is the first day rent is charged or just a key pickup or moving date. Check notice requirements, whether both boundary days count, and whether any move-in concession changes the base rent.
Prorated rent is only part of move-in cash. The moving out budget checklist lists the other costs due before you get the keys. If you share the unit, the rent split calculator divides the base rent among roommates.
When does this prorated rent calculator not fit?
- Your billing cycle does not follow calendar months. The tool assumes rent is due per calendar month, such as the 1st to the last day.
- Your dates cross two months. Only a range inside one month is accepted; split longer ranges yourself, if the lease supports that.
- You need deposits, utilities or fees prorated. Only base rent is calculated. Parking, pet charges, taxes, late fees and utilities are excluded.
- You need to know whether proration is owed. The tool does not decide whether proration is required or lawful; the lease and applicable rules do.
How the calculator handles inputs and rounding
Daily rates are kept unrounded until the final multiplication, and each final total is rounded to cents. Leap years are years divisible by four, except century years must also be divisible by 400, so February 29 is accepted only in those years.
The annual-365 basis always uses 365, even in a leap year, by definition of this illustrative convention; it is not an actual-year-days method. Results are not capped at monthly rent. Inputs are not stored or transmitted.
Quick decision checklist
- Find the lease clause on the first rent date and on partial months.
- Count days inclusively: last day − first day + 1.
- Ask the landlord which daily-rate method they use, in writing.
- Compare the three results so you know the size of any difference.
- Budget deposits, utilities and fees separately from prorated base rent.
Sources and review
- Consumer.gov, sample rental agreement, contract-term illustration.
- eCFR, 24 CFR § 966.4, public-housing lease terms only (eCFR current as of September 24, 2026).
- Trulia, What Is Prorated Rent?, first-party consumer explanation of alternative daily bases, inclusive day counting and the lack of a nationwide proration right.
Sources rechecked September 28, 2026. Calculation examples were rechecked by hand and against the calculator.
Prepared with AI-assisted research, drafting, and calculation checks. Not independently reviewed by a human financial professional.
