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Rent Increase Calculator UK

Project future rent with either annual percentage increases or fixed £ increases. For percentage reviews you can also round the charged rent while still tracking the true raw increase in the background.

Calculator inputs

Starting annual rent £8,400.00
Projection period 10 years
Enter the annual percentage increase.
Examples: 5, 10, 25, 50, 100
Final monthly rent £900.00
Total rent paid £96,000.00
Extra paid vs no increases £12,000.00
Final increase vs start 28.57%
Final raw rent before rounding £913.34

Year-by-year rent schedule

For percentage mode with rounding enabled, the raw rent continues to grow in the background while the charged rent only changes once the rounded threshold is reached.

Year Raw monthly rent Charged monthly rent Annual rent Annual increase Extra vs starting rent
Year 1 £700.00 £700.00 £8,400.00 £0.00 £0.00
Year 2 £721.00 £700.00 £8,400.00 £0.00 £0.00
Year 3 £742.63 £750.00 £9,000.00 £600.00 £600.00
Year 4 £764.91 £750.00 £9,000.00 £0.00 £600.00
Year 5 £787.86 £800.00 £9,600.00 £600.00 £1,200.00
Year 6 £811.49 £800.00 £9,600.00 £0.00 £1,200.00
Year 7 £835.84 £850.00 £10,200.00 £600.00 £1,800.00
Year 8 £860.91 £850.00 £10,200.00 £0.00 £1,800.00
Year 9 £886.74 £900.00 £10,800.00 £600.00 £2,400.00
Year 10 £913.34 £900.00 £10,800.00 £0.00 £2,400.00

Summary breakdown

Increase method Percentage (%)
Increase value 3.00%
Rounding used Yes
Round payments to £50.00
Total with increases £96,000.00
Total with no increases £84,000.00
Extra paid vs flat rent £12,000.00

How to read this calculator

  • This tool assumes one rent review per year and shows the monthly rent charged for each year of the projection.
  • For percentage increases, the calculator tracks the raw unrounded rent in the background before applying any optional rounding to the rent actually charged.
  • Rounding is applied to the charged rent only. Example: if raw rent moves from £721 to £742.63 and you round to £50, the charged rent would move from £700 to £750 once the raw value crosses the next rounding point.
  • Use the output as a planning estimate rather than a legal or contractual rent review notice.

What this rent increase calculator does

This tool helps you model what rent could look like over time if it rises each year by either a percentage or a fixed cash amount. It is particularly useful for sense-checking long-term affordability and understanding how repeated small increases can build up.

How the rounding option works

In percentage mode, the calculator can round the charged rent to a figure such as the nearest £10, £25 or £50. Importantly, it still tracks the raw unrounded rent behind the scenes. That means a year with no visible change can still feed into the next increase, exactly as you described in the £700 to £721 to £742.63 example.

Why this matters

Rent reviews are often easier to understand when you separate the mathematical increase from the actual rent charged. This lets you compare the “true” movement in rent with the amount a tenant may actually see after rounding rules are applied.

This calculator provides general estimates only and does not constitute financial, tax, or legal advice.