Pro-Rated Rent Formula: We divide your monthly rent by the total number of days in the move-in month to determine a daily rate. That daily rate is then multiplied by the number of days you will occupy the unit (from your move-in date through the last day of the month). For example, if your rent is $1,500 and you move in on January 15th in a 31-day month, your daily rate is $1,500 / 31 = $48.39, and your pro-rated rent is $48.39 x 17 days = $822.58.
Late Fee Calculation: Oregon law (ORS 90.260) requires a minimum 4-day grace period before any late fee can be charged. Late fees are capped at 5% of the monthly rent amount. Our calculator applies the grace period automatically and caps any fee that exceeds the 5% legal maximum. If you enter a percentage-based fee, we calculate it against the full monthly rent and then verify it does not exceed the statutory limit.
Data Sources: All calculations follow Oregon Revised Statutes Chapter 90 (Residential Landlord and Tenant). Grace period and late fee cap rules are based on ORS 90.260 as of 2026. We recommend verifying your specific lease terms, as some agreements may include additional provisions within the bounds of Oregon law.
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Compare Renters Insurance →Pro-rated rent is a partial month's rent calculated based on the number of days you occupy the unit during that month.
Divide monthly rent by total days in the month to get the daily rate, then multiply by the number of days you'll occupy the unit.
Pro-rated rent is typically due on your move-in date along with your security deposit.
Oregon law doesn't explicitly require pro-rating, but most landlords pro-rate rent when a tenant moves in mid-month. Check your lease agreement.
Oregon tenants have rights under ORS Chapter 90, including protections against excessive fees, proper notice requirements, and security deposit limits.