Prorated Rent Calculator
Prorated rent = daily rate × days you occupy. The daily rate depends on the method in your lease: most divide by the actual days in that month; some use a flat 30-day “banker’s month.” This calculator does both.
Move in on the 20th of a 31-day month with $1,800 rent and you owe $696.77 (12 days × $58.06/day). Under the 30-day method it’s $720.00 — check which one your lease names.
- $1,800, move in the 20th (31-day mo.)$696.77
- Same, 30-day method$720.00
- Daily rate (actual)$58.06
- Days billed12 (move-in day counts)
Formula: rent ÷ days-in-month × days occupied; move-in day counts as occupied.
Worked example
Rent $1,800, moving in March 20 (March has 31 days). Actual-days method: $1,800 ÷ 31 = $58.06/day; you occupy March 20–31 = 12 days; 12 × $58.06 = $696.77. Thirty-day method: $1,800 ÷ 30 = $60.00/day × 12 = $720.00. Neither is “correct” in the abstract — the lease controls, and a few states’ courts default to actual days when it’s silent.
Move-out proration
Same math, opposite end: pay daily rate × days through your move-out date. Landlords who require full-month notice may lawfully charge the full month — proration on exit is a lease term, not a right, in most states.
Frequently asked questions
How is prorated rent calculated?
Monthly rent ÷ days in the month × days you occupy (counting move-in day). Some leases instead divide by a flat 30 days regardless of month.
Is the move-in day counted?
Yes — the day you get keys is a day of possession, so it's billed.
Can I demand prorated rent?
For move-in, it's near-universal practice. For move-out, it depends on your lease and notice terms — many require paying through the end of the final month.
Which method is better for me?
In months with 31 days, actual-days gives a lower daily rate; in February, the 30-day method does. The difference is small — a few dollars a day — but check the lease's wording.
Sources & methodology
Sources: NumberBench methodology.
Results update as you type and are general estimates, not financial advice.