Rent Proration Calculator
Prorate monthly rent by days occupied in the move month.
What it does
Moving mid month splits rent by days. A 2000 lease with 10 occupied days in a 30 day month bills 666.67, not half. Daily rate times occupied days keeps both sides fair.
The tool above takes monthly rent, days in month, and occupied days and returns prorated rent, daily rate, and unused share. The defaults 2000, 30, and 10 match the worked example, so the page opens showing $666.67.
Daily rate is rent over days in month: 2000 / 30 = 66.67 per day. Prorated multiplies by occupied days. Unused subtracts from full rent. Leases vary on counting move in versus move out day, so confirm which nights count before billing.
This is cash math, not legal advice. Deposits, fees, utilities, and local proration rules sit outside. February needs 28 or 29 days to stay exact.
This page shows the formula, one full hand checked example at 2000 for 10 of 30, a reference table, and practice checks that run through the tool.
How to use
- Type full monthly rent.
- Type days in that month: 28, 29, 30, or 31.
- Type occupied days with keys.
- Read Prorated rent as the main result.
- Read Daily rate to quote per day.
- Read Unused share to reconcile the month.
Formula
- rent
- Full monthly rent in dollars.
- days
- Days in the specific month.
- occupied
- Days billed in that month.
Some leases use 30 days always or bankers 30/360. This tool uses actual month length you enter. Confirm move in versus move out counting in the lease.
Worked example
Example: 2000 for 10 of 30 days
Rent 2000, 30 day month, 10 days occupied. Find prorated rent.
- Daily: 2000 / 30 = 66.6667.
- Round daily: $66.67 per day.
- Prorated: 66.6667 x 10 = 666.6667.
- Formatted: $666.67.
- Unused: 2000 minus 666.67 = $1,333.33.
- Check: 666.67 + 1333.33 = 2000.
Reference table
| Month | 10 days | 15 days |
|---|---|---|
| 28 days | $714.29 | $1071.43 |
| 30 days | $666.67 | $1000.00 |
| 31 days | $645.16 | $967.74 |
Limits
- Cash only. Lease terms and local rules control disputes.
- Actual month length form. 30/360 leases need other math.
- No fees, deposits, or utilities here.
- Rounding to cents can leave a cent gap. Agree where it goes.
Common mistakes
- Using 30 days for February.
- Counting move out day on both sides.
- Dividing by occupied instead of month days.
- Forgetting daily rounding versus prorated rounding.
- Billing full month after early move out without lease basis.
Try it yourself
Quick checks. Answers sit tucked under each question.
1500 rent, 31 days, 15 occupied?
Daily $48.39, prorated $725.81, unused $774.19.
2400 rent, 28 days, 7 occupied?
Daily $85.71, prorated $600.00, unused $1,800.00.
Questions
How is prorated rent figured?
Rent over month days times occupied days.
2000 for 10 of 30?
$666.67.
February?
Use 28 or 29 days for that year.
Move in or move out day counts?
Lease decides. Confirm before billing.
Daily rate?
Full rent over month days.
Unused share?
Full rent minus prorated.