Does prorated rent depend on the number of days in the month?

Yes. The daily rate changes based on whether the month has 28, 29, 30, or 31 days. Moving in on the 15th of February (28 days) gives a different result than moving in on the 15th of March (31 days). This calculator automatically uses the correct number of days for the month and year you select.

When do landlords charge prorated rent?

Prorated rent applies whenever a tenant moves in or out on a day other than the first of the month. Most leases start on the first, but landlords commonly allow mid-month move-ins. The tenant then pays prorated rent for the partial first month and normal rent on the 1st every month after that.

Can my landlord refuse to prorate rent?

Landlords are generally not legally required to offer prorated rent unless your lease agreement specifies it. Many states and local ordinances do not mandate proration. Always clarify the prorated amount in writing before signing the lease.

What is the difference between prorating by days in the month vs. 30 days?

Some landlords use a flat 30-day divisor regardless of the actual days in the month, which simplifies calculation. Using actual calendar days is more precise. This calculator uses actual calendar days, if your landlord uses 30 days, you can adjust or divide rent by 30 manually.

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Prorated Rent Formula and Daily Rate: Why a $1,800 Apartment Costs $58.06 per Day in March but $64.29 in February

The daily rate is not fixed, it recalculates every month based on the actual number of calendar days. March has 31 days, so $1,800 ÷ 31 = $58.06 per day. February has 28 days, so $1,800 ÷ 28 = $64.29 per day. Moving in on the 15th of February leaves 14 days occupied at $64.29 each ($900.06), while moving in on the 15th of March leaves 17 days at $58.06 each ($987.10). The same move-in day in a shorter month always produces a higher bill.

Daily Rate  = Monthly Rent ÷ Days in Month
Move-In Due = Daily Rate × (Days in Month − Move-In Day + 1)
Move-Out Due = Daily Rate × Move-Out Day

The +1 in the move-in formula accounts for move-in day itself counting as a day of occupancy. Moving in on the 15th of a 30-day month means occupying days 15 through 30, that is 16 days, not 15.

Month	Days	Daily Rate ($1,800)	Move-In 15th (Days × Rate)
February	28	$64.29	$900.06
April / June / September / November	30	$60.00	$960.00
January / March / May / July / August / October / December	31	$58.06	$987.02

Move-In vs Move-Out Proration: How the 15th Means 16 Days Owed on Move-In and Only 15 Days Owed on Move-Out

The direction of proration flips depending on whether you are moving in or moving out. On a move-in, you pay for every day from arrival through the end of the month, including move-in day. On a move-out, you pay for every day from the 1st through and including your last day. For a 30-day month, the 15th produces 16 days owed on move-in and 15 days owed on move-out, even though both calculations start from the same day number.

Scenario	Days Occupied	Formula	Amount Due
Move-in on 15th (30-day month)	16 days	30 − 15 + 1 = 16	$960.00
Move-out on 15th (30-day month)	15 days	15 days from the 1st	$900.00
Move-in on 1st (full month)	30 days	30 − 1 + 1 = 30	$1,800.00
Move-out on last day (full month)	30 days	30 days from the 1st	$1,800.00

Some landlords use a flat 30-day divisor regardless of the actual month length. If your landlord calculates that way, the daily rate for $1,800/month is always $60.00. Confirm the method your lease specifies before calculating the final amount owed.

Five Prorated Rent Calculation Errors That Lead to Disputes Between Tenants and Landlords

Using the wrong number of days in the month

The daily rate changes every month. Dividing by 30 is an approximation, moving in on the 15th of February (28 days) leaves 14 days occupied, not 16. Always use actual calendar days for precision, and confirm which method your lease specifies.

Miscounting move-in days occupied by forgetting +1

Move-in day itself counts as a day of occupancy. If you move in on the 15th of a 30-day month, you occupy days 15 through 30, that is 16 days, not 15. The correct formula is: totalDays − moveInDay + 1. Forgetting the +1 underpays by one day's rent.

Selecting move-in mode when the lease requires move-out proration

Move-in proration pays for days from arrival to end of month. Move-out proration pays for days 1 through the last occupied day. Using the wrong mode produces the opposite result, worth confirming with your lease before writing a check.

Not getting the prorated amount confirmed in writing

Verbal prorated rent agreements lead to disputes. Before your move-in date, email your landlord with the calculated figure and ask for written confirmation. This creates a paper trail and prevents surprise charges on your first statement.

Including utilities, pet fees, or parking in the base rent

Only the lease rent amount should be prorated. Utilities, pet fees, parking, and storage add-ons are typically charged at full price regardless of move-in date unless your lease explicitly states otherwise. Prorating add-ons without agreement can create a shortage on the first payment.

Frequently Asked Questions

Prorated rent is calculated by dividing your monthly rent by the number of days in that month to get a daily rate, then multiplying by the number of days you actually occupy the unit. For a $1,800/month apartment with a move-in on the 15th of a 30-day month, the daily rate is $60 and you pay for 16 days: $60 × 16 = $960.

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Sources & References

U.S. Department of Housing and Urban Development, Tenant Rights and Rental Assistance ↗, Background on residential lease provisions, tenant protections, and move-in documentation requirements.

Consumer Financial Protection Bureau, Renting a Home ↗, Guidance on rental agreements, written confirmation requirements, and best practices for partial-month rent disputes.

National Multifamily Housing Council, Lease Administration and Proration Practices ↗, Industry standards for prorating rent on mid-month move-ins and move-outs, including daily rate methodology.

Hassaan Rasheed

Developer and Researcher, CalculatorFlux

Researches and verifies the formulas, methodology, and source data behind each calculator on CalculatorFlux. All tools are built and checked against the cited references before publication.

Last updated: June 2026

Proration Quick Reference

$1,800/mo Move-In Day	30-day month
Move in on the 5th	$1,560.00
Move in on the 10th	$1,260.00
Move in on the 15th	$960.00
Move in on the 20th	$660.00
Move in on the 25th	$360.00

Daily rate = $1,800 ÷ 30 = $60.00/day

Pro Tip

Get the prorated amount confirmed in writing before move-in
Confirm whether your landlord divides by actual days or a flat 30
Only prorate the base lease rent, not utilities or fees
Move-in day itself counts as an occupied day in the formula

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