How the math works
Days count both the first night and the last night. October 12 through October 31 is 20 days, and October has 31 days.
actual: prorated = rent 梅 days_in_month 脳 occupied_days
30-day: prorated = rent 梅 30 脳 occupied_days
365-day: prorated = rent 脳 12 梅 365 脳 occupied_days
If the range crosses a month boundary, each month is calculated separately, then added. This is not legal advice; the lease or local rule wins. Amounts are not converted between currencies.
FAQ
Do I pay for the move-out day?
This tool treats both dates as inclusive nights of occupancy. If your landlord charges through the morning you leave, that is the same as last night = the day before you hand back keys. Adjust the last-night date to match the lease.
Why is the 30-day method different?
A 30-day month ignores that February has 28 days and October has 31. Daily rent is slightly higher in long months under the actual-days method, and slightly lower under 30-day.