Landlord Calculator

Prorated Rent Calculator

When a tenant moves in or out partway through the month, here's exactly how much rent they owe for that partial month.

Opens live in the Rental Flow app, no account needed.

What this calculator does

Charging a full month's rent to a tenant who only occupies part of the month isn't right, and most leases call for prorating. This calculator divides the monthly rent by the actual number of days in that calendar month, then multiplies by the days occupied.

The formula

Prorated Rent = (Monthly Rent ÷ Days in the Month) × Days Occupied

Use the actual number of days in that specific month (28-31), not a flat 30. This is the standard method most leases and property managers use.

Worked example

$1,500/month rent, 30-day month, 12 days occupied

Monthly rent	$1,500
Days in the month	30
Days occupied	12
Prorated rent	$600

A tenant moving in on day 19 of a 30-day month occupies the final 12 days, and owes $600 of that month's rent.

How is prorated rent calculated?

Prorated rent is the partial rent owed when a tenant moves in or out partway through a month. The usual method divides the monthly rent by the number of days in the month to get a daily rate, then multiplies by the days the tenant actually occupies the unit.

Proration keeps a mid-month move fair to both sides. Decide and document up front whether you prorate by the actual days in that month or by a flat 30-day month, since the two methods produce slightly different amounts.

Try it with your own numbers →

Frequently asked questions

How do I calculate prorated rent?

Divide the monthly rent by the number of days in the month to find the daily rate, then multiply by the number of days the tenant occupies the unit. For example, moving in with 12 days left in a 30-day month means 12 daily rates are owed.

Should I prorate by 30 days or actual days?

Both methods are used. Dividing by the actual number of days in the specific month is the most precise; some landlords use a flat 30-day divisor for simplicity. Pick one method, state it in the lease, and apply it consistently.

When is prorated rent charged?

Proration usually applies when a tenant moves in after the first of the month or moves out before the last day. It ensures the tenant pays only for the days they actually have the unit, rather than a full month's rent for a partial month.

Does prorated rent apply to move-out too?

Yes, if your lease allows a mid-month move-out. The same daily-rate method applies: the tenant owes rent only for the days occupied in their final month. Confirm your lease terms, since some require a full final month regardless of move-out date.