Pro-Rata Rent Payments Calculator for Landlords

Pro-Rata Rent Payments (Move-In & Move-Out)

Tenancies rarely begin or end exactly on a rent due date. The August Pro-Rata Rent Calculator gives you a fair, consistent figure for partial months, so tenants know what they owe on day one (or what they’re due back at the end), and landlords keep ledgers accurate. Model pro-rated rent for mid-month move-ins, early terminations, renewals with changed due dates, and weekly/four-weekly rents. Ready to try August?

What the calculator does and why it’s different

Most tools give one number. Ours shows the amount and the method behind it, so everyone can see the working:

• Choose Monthly / Weekly / Four-weekly rent schedules.

• Pick a calculation method (see below) and we show the daily rate used.

• Handle move-in or move-out pro-rations, including rent-due-date alignment.

• Generate a clean breakdown for the tenancy file and export it to August in one click.

Two accepted methods for monthly rents

Both approaches are used in UK lettings. The key is to pick one method and apply it consistently, preferably as stated in your tenancy agreement.

1. “Exact Month” method (calendar-accurate)
   Daily rate = Monthly rent ÷ number of days in that calendar month
   Pro-rata amount = Daily rate × number of occupied days

• Pros: Mirrors the actual month length (28–31 days).

• Cons: The daily rate changes each month.

• Typical for: Managing agents and most ASTs that reference calendar months.

2. “365-day” method (annualised)
   Daily rate = (Monthly rent × 12) ÷ 365 (use 366 in a leap year if you want strict accuracy)
   Pro-rata amount = Daily rate × number of occupied days

• Pros: One unchanging daily rate (transparent across months).

• Cons: Slightly different to the Days-in-Month figure in 28/29/31-day months.

• Typical for: Portfolio reporting and lenders’ pro-rations.

Which should I use?
If your AST specifies a method, use that. If not, the Exact Month method is the most intuitive for tenants. The 365-day method is best for portfolio consistency. The calculator supports both and shows the difference.

Worked examples for monthly tenancy

Example A — Move-in mid-month (Exact Month)

• Monthly rent: £1,500 (due on the 1st of each month)

• Tenancy start: 15 September 2025 (30-day month)

• Occupied days in Sept: 16 (15th–30th inclusive)

• Daily rate: £1,500 ÷ 30 = £50.00

• Pro-rata due at move-in: 16 × £50.00 = £800.00

• Next full payment: £1,500 on 1 October.

Example B — Move-out part-way (365-day method)

• Monthly rent: £1,200 (due on the 10th)

• Move-out: 28 February 2026 (leap year; choose 366 for strict accuracy)

• Occupied days in final period: 19 (10th–28th inclusive)

• Daily rate: (£1,200 × 12) ÷ 366 = £39.34

• Final pro-rata: 19 × £39.34 ≈ £748.

• If the tenant paid the full £1,200 on 10 Feb, the landlord refunds ≈ £452.

Weekly and four-weekly tenancies

Some tenancies legitimately use weekly or four-weekly rent (common in HMOs). Use these rules:

• Weekly rent- Daily rate = Weekly rent ÷ 7. Pro-rata = daily rate × occupied days.

• Four-weekly rent - Daily rate = Four-weekly rent ÷ 28.

• If converting weekly to monthly for comparables, use Weekly × 52 ÷ 12 (not 4.33 rounded by hand, use the calculator).

Best practice for fairness

• Write the method into your tenancy agreement or offer letter (“Pro-rata rent will be calculated using the [Exact Month / 365-day] method”).

• Show your working - Share the breakdown (daily rate × days).

• Keep dates consistent - Count the start and end dates you agree (inclusive), and use the same approach for refunds.

• Separate rent from fees/deposit - Pro-rata rent is rent. Keep deposits, damages, and any permitted fees distinct in the ledger.

How to use the August Pro-Rata Calculator

1. Select rent schedule (Monthly / Weekly / Four-weekly) and enter the headline rent.

2. Choose Move-in or Move-out, add the relevant start/end dates, and (for monthly) select Exact Month or 365-day method.

3. Optional: Align to due date, set rounding.

4. Hit Calculate for the pro-rated amount and the daily-rate working.

Disclaimer

This calculator provides pro-rata rent payment estimates for guidance only and does not constitute legal, financial, or tenancy advice. Actual amounts payable or refundable may vary depending on your tenancy agreement, landlord policies, and applicable regulations. Always confirm amounts with your landlord, letting agent, or a qualified housing adviser before making payment decisions.

Related August Calculators

1. Tenant Rent to Income Calculator

2. HMO Calculator

3. Rent Payment Term Calculator

4. Main Calculator page