Pro Rata Rent Calculator

What is pro rata rent?

Pro rata rent (also called prorated or part-month rent) is the rent you pay when you do not occupy a property for a full rental period. It is most common when you move in part-way through the month, move out before the month ends, or when a landlord wants to align all future payments to the 1st of the month. Instead of paying a full month for, say, only 11 days of occupancy, you pay only for the days you are actually liable for.

This calculator is for tenants, landlords and letting agents in the UK who need a fast, transparent figure. Charging rent itself is a permitted payment under the Tenant Fees Act 2019, so a fair pro-rata adjustment for a part month is entirely legitimate — it simply makes sure you pay for the time you have the property and nothing more. The tool supports both UK-standard daily-rate methods and weekly rents, and shows you exactly how the number is built so you can check it against your tenancy agreement.

How it works

The calculation is simple arithmetic: pro-rata rent = daily rate × occupied days. The only thing that varies is how the daily rate is worked out. There are two methods commonly used in the UK for monthly rents:

• Exact-month method: daily rate = monthly rent ÷ the number of days in that specific month. February (28/29 days) gives a higher daily rate than a 31-day month. This is the most common approach for a single part-month.
• Annualised (365-day) method: daily rate = monthly rent × 12 ÷ 365. This produces one consistent daily rate all year and is often preferred by larger letting agents.

For weekly rents the daily rate is always weekly rent ÷ 7. "Occupied days" are counted inclusively — both the first night and the last night you are charged for are included. The calculator also shows the date your first full monthly payment is due, which is normally the 1st of the month after your move-in month once the part-month has been settled.

Worked example

Suppose your rent is £1,200 per calendar month and you move in on 20 June 2026, occupying to the end of the month (30 June 2026).

• Occupied days (20–30 June, inclusive) = 11 days.
• Exact-month method: June has 30 days, so daily rate = £1,200 ÷ 30 = £40.00. Pro-rata rent = £40.00 × 11 = £440.00.
• Annualised method: daily rate = £1,200 × 12 ÷ 365 = £39.4521. Pro-rata rent = £39.4521 × 11 = £433.97.
• Your first full monthly payment of £1,200 would then be due on 1 July 2026.

Both methods are legitimate; your tenancy agreement should state which one applies. The exact-month method is shown by default.

Frequently asked questions

Which pro rata method is correct in the UK?

There is no single legally mandated method. The two accepted approaches are the exact-month method (rent ÷ days in that month) and the annualised method (rent × 12 ÷ 365). Your tenancy agreement should specify which is used; if it does not, the exact-month method is the most common and the easiest to verify.

Are the move-in and move-out days both counted?

Yes. This calculator counts occupied days inclusively, so both the first night you move in and the last night you are charged for are included. For example, 20 June to 30 June inclusive is 11 days, not 10.

Can a landlord charge a fee for working out pro rata rent?

No. Under the Tenant Fees Act 2019 in England, landlords and letting agents cannot charge admin fees for routine tasks like calculating a part-month adjustment. Rent itself is a permitted payment, but extra charges on top are generally banned.

How is pro rata rent calculated for a weekly tenancy?

For weekly rent the daily rate is weekly rent ÷ 7, then multiplied by the number of occupied days. The exact-month and annualised options only apply to monthly (pcm) rents.

Source: GOV.UK – Private renting (tenancy types, rent and tenant rights in England). Daily-rate methods use standard calendar arithmetic (actual days in each month and 365 days per year).