Prorated rent calculator
Work out move-in or move-out rent by actual days, a 30-day month or a 365-day year. Handles weeks-free concessions and writes the note to the tenant.
Rent and dates
Concession (optional)
Note for the tenant
How prorated rent is calculated
Prorated rent charges only for the days the tenant actually has the unit. You work out a daily rate, then multiply it by the number of days.
Worked example
Rent is $2,400 and the tenant moves in on September 15. September has 30 days, so the daily rate is $80 and the tenant is charged for 16 days (the 15th through the 30th): $1,280. With the 365-day method the daily rate is about $78.90, so the same 16 days come to about $1,262.
Weeks free and net effective rent
Concessions such as “6 weeks free” or “8 weeks free” on a 12-month lease are common in new buildings. Six weeks of a $2,400 rent is worth about $3,323, so the net effective rent is about $2,123 a month. Landlords usually advertise both numbers. Some take the free weeks off the first payments, others spread them across the lease.
Things to check
- Your lease is the first place to look. If it names a method, use it.
- Some states and cities have rules for the final month or for rent paid in advance. Check local rules before you charge a move-out proration.
- Many landlords collect the prorated amount plus the next full month when a tenant moves in late in the month, so the first regular payment lands on the 1st.
Questions people ask
How do I calculate prorated rent?
Find the daily rate (monthly rent divided by the days in the month, by 30, or rent × 12 ÷ 365) and multiply it by the number of days the tenant occupies the unit in that month, including the move-in day.
Is the move-in day included in prorated rent?
Usually yes. A tenant who moves in on the 15th of a 30-day month normally pays for 16 days, from the 15th through the 30th. Check your lease if it says otherwise.
Which day-count method is most common?
Many landlords use the actual number of days in the month. Some use a 30-day month for simplicity, and some use the 365-day method so the daily rate is the same all year. Use whatever your lease states.
What does 6 weeks free mean on a 12-month lease?
The tenant gets about 6 weeks of rent free over the lease. On $2,400 rent that is worth about $3,323, making the net effective rent about $2,123 a month.
Do I have to prorate rent?
Not always. Whether proration is required at move-in or move-out depends on your lease and on state or local law. This calculator does the math; it is not legal advice.
Last updated October 30, 2026. Built by Hasham Akram, founder of Closing Scale. Estimates only, not legal, tax or financial advice.