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Rent Increase Calculator UK

Estimate future rent using annual percentage increases or fixed cash increases, with optional rounding for percentage-based rent reviews.

Calculator inputs

Estimate how rent may change over time with either annual percentage increases or fixed cash increases.

Starting annual rent £8,400.00
Projection period 10 years
Enter the annual percentage increase.
Examples: 5, 10, 25, 50, 100

Rent increase results

See the final rent, total paid over the full projection, and the extra cost compared with keeping rent flat.

Final monthly charged 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
Projection period 10 years
Starting monthly rent £700.00

Year-by-year rent schedule

In percentage mode with rounding enabled, raw rent can keep rising in the background while charged rent only changes once it reaches the next rounding threshold.

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

Core assumptions and totals from the existing calculator logic.

Increase method Percentage (%)
Increase value 3.00%
Rounding used Yes
Round charged rent 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.

NEXT STEPS

What to check after projecting rent increases

Once you know how rent could rise over time, these related UK finance calculators can help you compare renting with buying, check mortgage costs, estimate affordability and plan your wider housing budget.

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Rent Increase Calculator UK

This rent increase calculator helps you project how rent could change over time if it rises each year by either a percentage or a fixed cash amount. It is useful for tenants, landlords, and anyone planning ahead for housing costs in the UK.

You can use it to estimate future monthly rent, compare different rent review assumptions, and understand how optional rounding affects the amount actually charged.

What this calculator includes

  • Starting monthly rent
  • Projection period over multiple years
  • Annual percentage increases
  • Annual fixed £ increases
  • Optional rounding for percentage-based rent reviews
  • Underlying raw rent tracking alongside charged rent

How it works

The calculator starts with your current rent and applies either a percentage increase or a fixed cash increase once per year. In percentage mode, it can also round the visible charged rent to a chosen figure such as the nearest £10, £25 or £50.

Importantly, when rounding is enabled, the tool still tracks the true unrounded rent in the background. That means a year with little or no visible change in charged rent can still influence the next year’s increase.

Why results may not match a real rent review

This is a planning tool, so actual outcomes may differ depending on tenancy terms, negotiation, local market conditions, legal requirements, or whether a landlord applies the increase exactly as modelled here. Some rent reviews may also happen at different intervals rather than once per year.

Who it’s for

  • Tenants budgeting for future rent increases
  • Landlords projecting rental income
  • Home movers comparing long-term renting costs
  • Anyone modelling the effect of annual rent reviews

Rent increase examples

  • £700 rent rising by 3% each year over 5 years
  • £950 rent rising by £25 per year over 10 years
  • Rounded rent reviews where the visible charge changes less often than the underlying raw rent

Important note

This calculator provides estimates only and does not constitute financial, tax, or legal advice. It does not check whether a proposed rent increase is valid under your tenancy agreement or current housing rules.

Use the calculator above to estimate how future rent increases could affect your housing costs over time.

Rent Increase Calculator FAQs

It starts with your current rent and applies either a yearly percentage increase or a fixed yearly cash increase. It then shows how the rent could change over time based on those assumptions.

Raw rent is the exact mathematical result after applying the increase. Charged rent is the rounded figure that may actually be shown if rounding is enabled.

When rounding is switched on, the raw rent can rise in the background without crossing the next rounding threshold. In that case, the visible charged rent stays flat until that threshold is reached.

It supports both. You can model annual rent reviews as a percentage or as a fixed £ increase each year.

No. This is a planning calculator only. It does not check tenancy agreement terms, notice requirements, or whether a proposed increase complies with current rules.

Yes. It is useful for estimating how repeated annual rent increases could affect your monthly housing budget over time.

Real rent reviews may depend on negotiation, market rents, contract wording, legal limits, and whether increases happen every year or at different intervals.