Prorated rent, calculated to the penny. Free.
Mid-month move-in or move-out? Enter the rent and the date, pick your billing method, and get the daily rate, days occupied, and prorated amount — with the math written out so your tenant can follow it.
Enter the rent and a date and this panel updates live.
The three proration methods, briefly
- Actual days in the month — divide the rent by that month's real day count (28–31). The most common and most intuitive method: a tenant occupying half of June pays exactly half of June's rent.
- Banker's month (30 days) — treat every month as 30 days. Simple and consistent across the year, but slightly overcharges in 31-day months and undercharges in February.
- Days in the year (365 ÷ 12) — annualize the rent (× 12), divide by 365, then multiply by actual days occupied. One uniform daily rate all year; favored by some larger operators.
If your lease specifies a proration method, follow the lease — it controls. If it's silent, pick one method, apply it consistently to every tenant, and put it in writing.
Educational estimate only — not legal or accounting advice. Your lease and local law govern how rent is prorated.
More free tools: AI Lease Summarizer · Schedule E Calculator · Rent Increase Notice Generator
Get the first (and last) rent check right
A prorated rent number you can't explain is a dispute waiting to happen. This calculator shows its work, so the amount on the move-in invoice is the amount everyone agrees on.
All three billing methods
Actual days in the month, the banker's 30-day month, and the 365-day annual method — pick whichever your lease specifies and compare what each one charges.
Math your tenant can check
Every result comes with the arithmetic written out step by step — copy it straight into your welcome email so there's never a dispute about how you got the number.
Move-in or move-out
Flip one toggle to prorate a partial first month or a partial last month. Leap years, 28-day Februaries, and 31-day months are all handled correctly.
Keystead tracks every rent payment automatically.
Prorated first months, regular rent, late fees — auto-matched from your bank to the right tenant and property, with a clean ledger you never have to reconcile by hand.