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Prorated Rent Calculator

Estimate rent for a partial month. Enter monthly rent, the billing month, and the move-in and move-out dates for the time you occupy the unit.

Defaults to the last day of the billing month.

Enter rent and occupancy dates to see prorated rent.

Next step: Invoice Due Date Calculator

When to use this calculator

Use this calculator whenever a lease does not cover a full billing month—moving in or out mid-month—and rent needs to be scaled to the days actually occupied.

  • Mid-month move-in

    Estimate first-month rent when a tenant's lease starts partway through the billing month.

  • Mid-month move-out

    Estimate final rent owed when a tenant vacates before the billing month ends.

  • Landlord rent statement verification

    Check a landlord's or property manager's prorated rent figure against your own calculation before paying.

  • Move-month budgeting

    Pair with the Prorated Salary Calculator when budgeting both a partial paycheck and partial rent in the same move month.

Inputs

  • Monthly rent

    The full monthly rent amount stated in the lease, before prorating.

  • Billing month

    The calendar month the rent statement covers—this sets the number of days used as the proration denominator.

  • Move-in date

    The first day of occupancy within the billing month being calculated.

  • Move-out date (optional)

    The last day of occupancy within the billing month. If left blank, it defaults to the last day of the billing month—useful for a move-in-only calculation where the tenant stays through month-end.

How the calculation works

Daily rent is monthly rent divided by the number of days in the billing month—28, 29, 30, or 31 depending on the month and leap year, using the actual calendar rather than a fixed 30-day assumption.

Occupied days are counted inclusively on the UTC calendar between the move-in and move-out dates, clipped to the billing month's start and end—so a move-in date before the month or a move-out date after it does not extend the count beyond that month.

Prorated rent is the daily rate multiplied by occupied days. Pick the billing month that matches your lease statement (for example, the month you are paying for).

Worked example

Monthly rent: $2,000. Billing month: March 2025 (31 days). Move-in date: 10 March. Move-out date: left blank (defaults to 31 March).

Daily rate: $2,000 ÷ 31 ≈ $64.52.

Occupied days: 10 March through 31 March, inclusive = 22 days.

Prorated rent: $64.52 × 22 ≈ $1,419.35.

Edge cases

  • Move-in and move-out in the same short window

    A move-in and move-out date only a few days apart within the billing month prorate correctly to that small day count—useful for short-term sublets billed on a monthly lease.

  • Dates outside the billing month

    A move-in date before the billing month's start, or a move-out date after its end, is clipped to the month's boundaries rather than extending the day count into an adjacent month.

  • 28-day February vs 31-day months

    The same monthly rent produces a higher daily rate in February (28 or 29 days) than in a 31-day month, since the daily rate is the full rent divided by however many days that specific month has.

  • Full-month occupancy

    Setting move-in to the 1st and leaving move-out blank (or setting it to the last day) prorates to the full monthly rent—useful as a sanity check before adjusting dates for an actual partial month.

Related Finance & Billing Calculators

The Net Payment Terms Guide is the primary reference for what Net 10, Net 15, Net 30, Net 45, Net 60, and Net 90 mean, and how calendar vs business days affect an invoice due date.

The Invoice Due Date Guide explains how invoice due dates are calculated step by step, including weekend handling and common mistakes with start dates.

The Invoice Due Date Calculator finds a due date from any invoice date and payment term—Net 7, Net 10, due on receipt, or a custom day count—with optional weekend adjustment.

The Net 15 Calculator, Net 30 Calculator, Net 45 Calculator, and Net 60 Calculator are fixed-term shortcuts for the same due-date math, for the most commonly searched payment terms.

The How Prorated Rent Is Calculated guide and Prorated Rent Calculator cover partial-month rent for a move-in or move-out date that falls mid-billing-period, using the same daily-rate proration logic as prorated salary.

For accounts-payable timing that depends on business days rather than calendar days, see the Business Days Calculator and Add Business Days To Date Calculator in Date & Business Days.

For contract terms tied to invoicing or billing—renewal windows and end dates—see the Contract End Date Calculator in Contracts & Legal.

FAQ

Are utilities or deposits included?
No. This tool prorates base rent only. Deposits, fees, and utilities are separate line items on a lease.
Which month should I select?
Choose the calendar month on your rent invoice. Occupancy dates are clipped to that month for the day count.
Why does my landlord's number differ slightly?
Some landlords use a fixed 30-day month for every proration instead of the actual number of days in the billing month. Confirm which convention your lease uses before comparing figures.
What if I only know the move-in date, not the move-out date?
Leave move-out blank—the calculator defaults it to the last day of the billing month, which works for a standard mid-month move-in where the tenancy continues through month-end.
Is this legal advice for my lease?
No. Leases vary by landlord and region. Use this as a planning estimate and confirm terms in your agreement.

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