Calculator
Prorated rent calculator
Calculate exact prorated rent for a mid-month move-in or move-out. Both the actual-days and 30-day methods, with the math shown.
Frequently asked questions
How is prorated rent calculated?
Prorated rent is the portion of monthly rent a tenant owes for a partial month. The most common method divides the monthly rent by the actual number of days in the month to get a daily rate, then multiplies by the number of days occupied. For a $1,500/month unit and a May 15 move-in: $1,500 ÷ 31 days × 17 days (May 15–31) = $822.58. Some landlords use a 30-day month instead (always divide by 30), which gives $850.00 for the same scenario.
Which proration method should I use: actual days or 30-day?
The actual-days method (dividing by the real number of days in the month) is the most common in residential leasing and is what most tenants expect. The 30-day method produces a consistent daily rate regardless of the month, which some property management software uses by default. Check your lease agreement; if it doesn't specify, the actual-days method is the safer default. Whichever you choose, be consistent and transparent with your tenants.
What is the difference between move-in and move-out proration?
Move-in proration covers the days from the tenant's first day through the end of that month. Move-out proration covers the days from the 1st of the month through the tenant's last day (inclusive). Both use the same daily-rate math. The only difference is which portion of the month you're calculating.
Is prorated rent required by law?
Most states do not have a law that specifically requires prorated rent, but landlords generally must charge rent proportional to the period of occupancy. Charging a full month's rent for a partial month could be considered a breach of the implied covenant of good faith in many jurisdictions. Check your state's landlord-tenant law for specifics. Offering prorated rent is also simply good practice and reduces move-in friction.
Does prorated rent include security deposit?
No. The security deposit is a separate, fixed amount (typically 1–2 months' rent) and is not prorated. Only the rent charge for the partial first month is prorated. At move-in, a tenant typically pays: prorated first month's rent + security deposit (+ any last month's rent your lease requires).
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