Prorated Rent Calculator

How Much Rent Do You Owe When You Move In Mid Month?

It is one of the most common small mysteries of renting. Your lease says $1,800 a month, but you are moving in on the 12th, so what do you actually owe on day one? The answer is prorated rent: a fair share of the monthly rent based on the exact days you occupy the unit. Tenants use it to avoid paying for days they never lived there, and landlords use it to keep the books clean when a lease starts or ends mid month.

The idea is simple, but the details matter: which day counts as occupied, how many days are in the month, and which calculation method your lease names. Get any of those wrong and the number can be off by fifty dollars or more. This calculator handles all three standard methods, counts the days from real calendar dates, and compares them side by side before anyone signs anything.

How Prorated Rent Is Calculated

The formula is three steps. First, find the daily rate: divide the monthly rent by the number of days in the month. Second, count the days occupied, including the move-in day itself. Third, multiply the daily rate by the days occupied.

For a move-in, the days occupied run from your move-in day through the last day of the month. Move in on March 12 and you occupy 20 days (the 12th through the 31st), not 19. For a move-out, the days occupied run from the 1st through your move-out day. If both dates fall in the same month, as with a short sublet, count the days between them, including both ends.

The Three Calculation Methods Compared

Not all leases do the division the same way, and the method can change the answer:

Here is where the math gets interesting. In a 31-day month, the actual-days method gives the tenant the lowest daily rate; in February it gives the highest. The 30-day standard and the banking method are identical within a single month (both work out to rent / 30), so the real choice is between actual days and the 30-day flat rate. The calculator above runs all three side by side and flags the difference.

Worked Example: $1,800 Rent, March 12 Move-In

Here are the exact numbers for a $1,800 lease with a March 12, 2026 move-in. March has 31 days.

The tenant saves $38.71 because March is a long month. In February the situation flips: the actual-days method divides by 28, which raises the daily rate. That is why the method in the lease matters more than most renters realize.

What Different Move-In Days Cost

To make the relationship concrete, here is what the same $1,800 lease costs for different March 2026 move-in days under the actual-days method:

Every day you delay a move-in during a long month saves roughly $58 on this lease. Moving in on the 25th instead of the 15th saves about $580, on top of everything else you are paying for the move itself.

Your First Payment Is More Than the Prorated Rent

One more thing catches new tenants off guard: the check you write on move-in day is rarely just the prorated rent. Most landlords collect the prorated rent, the security deposit, and any fees (application, pet, parking) all at once. With the $1,800 lease from our example, a $1,800 deposit, a $75 application fee, and a $250 pet deposit, the move-in total comes to $3,286.29: that is $1,161.29 in prorated rent plus $2,125 in deposits and fees.

Because that lump sum can be the biggest check of the year, plan for it. A savings goal calculator can work backwards from your move-in date to show what to set aside each week, and it helps to rebuild your emergency fund after the move since the deposit has eaten into it. If you are weighing one more year of renting against buying, run the monthly comparison through our mortgage calculator to see how the two really stack up.

How to Use This Calculator

Pick your scenario: moving in, moving out, or both in the same month. Enter your monthly rent and your date using the calendar picker, then choose the method (actual days is the safest default unless your lease names another). Add your deposit and any fees to see the full first-payment total. The tool shows the daily rate, the exact occupancy period, a line-by-line breakdown, and a comparison of all three methods so you can spot the difference before you pay.

Frequently Asked Questions

How do you calculate prorated rent?
Divide the monthly rent by the number of days in the month to get the daily rate, then multiply by the days you occupy the unit. For a move-in, count from your move-in day through the last day of the month. For a $1,800 lease with a March 12 move-in: $1,800 / 31 days = $58.06 per day, times 20 days = $1,161.29.

Should I use actual days or a 30-day month to prorate rent?
Actual days is the most common and the most tenant-friendly method: it uses the real length of the month, so it gives a lower daily rate in 31-day months and a higher one in February. A 30-day standard divides by 30 no matter the month. The method written in your lease is the one that applies.

What is the banking month method for prorated rent?
The banking method assumes a 360-day year, so the daily rate is (monthly rent x 12) / 360. For a single month that is exactly monthly rent / 30, identical to the 30-day standard. It shows up mostly in commercial and corporate leases.

Do you count the move-in day in prorated rent?
Yes. The move-in day counts as a full day of occupancy even if you get the keys in the afternoon. A March 12 move-in means 20 days occupied (the 12th through the 31st), not 19. The same applies in reverse for the move-out day.

Is prorated rent due on move-in day?
Usually yes. Prorated rent for the partial first month is typically due on or before the move-in date, separate from the first full month's rent due on the 1st of the following month. The security deposit and any fees are usually collected at the same time, so budget for the full first-payment total.