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Prorated Rent Calculator

Calculate prorated rent for a partial month based on days occupied, move-in date, or move-out date. Get the exact daily rate and prorated amount instantly.

Author: Naeem Ullah
•Last Updated: July 6, 2026•
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Active Calculation FormulaProrated Rent = (Monthly Rent ÷ Days in Month) × Days Occupied

Adjust Variables

USD
$
monthlyRent
Min: $1Max: $5k
days
daysInMonth
Min: 28 daysMax: 31 days
days
daysOccupied
Min: 1 daysMax: 31 days
Use Real Campaign Presets
Real-Time ResultsUSD
Prorated Rent$0
Daily Rent Rate$0
Amount Not Charged$0
All calculations are compiled with double-precision floating math directly in this browser frame. Perfect precision guaranteed.

Interactive Step-by-Step Calculation Proofs

View how variables resolve algebraically down to peer-reviewed standard outputs.

Why Use This Calculator

Prorated rent is the partial-month amount a tenant owes when they move in or move out on a date other than the first of the month — instead of paying the full monthly rent for a period they didn't fully occupy. Landlords and property managers calculate it by first finding the daily rent rate (Monthly Rent ÷ Days in Month), then multiplying that rate by the number of days actually occupied. There are two common methods: the exact days-in-month method, which divides by the real number of days in the specific month (28–31), and the banker's month (30-day) method, which some leases specify for simplicity by always dividing by 30 regardless of the actual month length. The two methods can produce slightly different results, so it's worth checking which one your lease specifies. Our prorated rent calculator supports three ways to get the answer: enter the days occupied directly, enter your move-in day of the month, or enter your move-out day of the month — each mode returns the prorated rent, the daily rate, and either the days occupied or the amount not charged. For proration outside of rent — insurance premiums, salary, or ownership shares — see the general-purpose pro rata calculator.

Mathematical Formula Explanation

Calculated standard benchmarks are based on direct functional dependencies. The primary calculation logic follows this formula:

Prorated Rent = (Monthly Rent ÷ Days in Month) × Days Occupied

All three modes compute the same daily rate (Monthly Rent ÷ Days in Month) but differ in how they determine days occupied. Prorate by Days Occupied takes that count directly as an input. Prorate by Move-In Date derives it by counting from the move-in day through the end of the month. Prorate by Move-Out Date derives it by counting from the 1st of the month through the move-out day. The daily-rate math is identical across all three — only the days-occupied source changes.

Worked Examples (Step-by-Step)

These examples show rent prorated for a mid-month move-in and a mid-month move-out, each in a different-length month.

Case Scenario 1

Example 1: Moving In Mid-Month

“A tenant signs a lease for $1,500/month rent and moves in on June 15th. June has 30 days. How much rent is owed for June?”

Given Inputs
  • MONTHLYRENT: 1,500
  • DAYSINMONTH: 30
  • MOVEINDAY: 15
Computed Outputs
  • PRORATEDRENT: 800
  • DAILYRATE: 50
  • DAYSOCCUPIED: 16
Case Scenario 2

Example 2: Moving Out Mid-Month

“A tenant pays $1,800/month rent and gives notice to move out on March 10th. March has 31 days. How much rent is owed for March?”

Given Inputs
  • MONTHLYRENT: 1,800
  • DAYSINMONTH: 31
  • MOVEOUTDAY: 10
Computed Outputs
  • PRORATEDRENT: 580.65
  • DAILYRATE: 58.06
  • DAYSOCCUPIED: 10

Frequently Asked Questions (FAQ)

Use two steps: (1) Find the daily rent rate: Daily Rate = Monthly Rent ÷ Days in Month. (2) Multiply the daily rate by the number of days occupied: Prorated Rent = Daily Rate × Days Occupied. For example, at $1,500/month rent in a 30-day month, the daily rate is $50. If the tenant occupies the unit for 15 days, prorated rent = $50 × 15 = $750.

Count the day of move-in as an occupied day, then count every remaining day through the end of the month. The formula is: Days Occupied = Days in Month − Move-In Day + 1. For a June 15th move-in (30-day month): Days Occupied = 30 − 15 + 1 = 16 days. Multiply that by the daily rate to get the prorated rent owed for June.

Count every day from the 1st of the month through and including the move-out day. The formula is simply: Days Occupied = Move-Out Day. For a March 10th move-out, days occupied = 10. Multiply by the daily rate to find how much rent is owed for that final, partial month.

Prorated rent means rent that has been proportionally adjusted for a partial rental period rather than a full month. It applies whenever a tenancy starts or ends on a date other than the first or last day of the month — the tenant pays only for the days they actually occupy the unit, calculated as a fraction of the full monthly rent.

The exact-days method divides monthly rent by the real number of days in that specific month (28, 29, 30, or 31), so the daily rate changes slightly month to month. The banker's month method always divides by a fixed 30 days, regardless of the actual month length, which simplifies the math but can produce a slightly different result — for example, in a 31-day month the banker's method slightly overcharges each day compared to the exact-days method. Always check your lease to see which method it specifies; the exact-days method is more common and generally considered fairer.

Standard practice is to count the move-in day as occupied (the tenant has possession that day) and to count the move-out day as occupied too (the tenant hasn't vacated until that day ends). Some leases instead treat move-out as the last day of occupancy and exclude it — check your specific lease language, since this one-day difference changes the prorated total.

Use February's actual day count — 28 days in a common year or 29 in a leap year — as the 'Days in Month' input, unless your lease specifies the fixed 30-day banker's method. Because February has fewer days, the daily rate is higher than in a 30- or 31-day month for the same monthly rent, so prorated amounts for partial stays in February will be slightly larger per day than in longer months.

Generally no — most leases and state landlord-tenant laws require rent to be prorated fairly based on days occupied, not rounded up or charged as a full month. However, some leases include a flat 'move-in fee' or use the 30-day banker's method (which can be marginally higher than the exact-days method in longer months). Always review your lease terms, since proration methods are set by contract and can vary by state and property manager.

Use the 'Prorate by Days Occupied' mode: enter your monthly rent, the number of days in that month, and the number of days you'll occupy the unit (e.g., 7 for one week). The calculator returns the exact prorated rent and the daily rate, so you can also use it to check partial-week charges or rent credits for maintenance outages.

Sources & Methodology

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