How do I calculate a rent increase percentage?
Subtract the current monthly rent from the proposed rent, divide that increase by the current rent, then multiply by 100. This calculator does that automatically.
Free UK landlord tool
Rent Increase Calculator
See exactly what a proposed rent increase means in pounds and percentage terms, then check the process that applies where the property is located. Arithmetic alone does not make a rent increase legally valid.
Enter the current and proposed rent to see the financial impact and process guidance.
Rent increase calculator versus rent increase notice
This calculator answers two different questions. First, it shows the financial effect of the proposed change. Second, it provides process guidance for the selected jurisdiction. These should not be confused: a mathematically reasonable increase can still be invalid if the wrong notice, timing or tenancy process is used.
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Frequently asked questions
How often can rent be increased in England?
For private assured periodic tenancies under the post-May 2026 regime, rent generally cannot be increased in the first year, can then be increased no more than once a year, and the landlord must use Form 4A with at least two months' notice.
Does the same notice period apply across the UK?
No. Scotland, Wales and Northern Ireland have different tenancy frameworks and procedures, so the calculator does not reuse the England rule for those jurisdictions.
This tool provides general information, not legal advice. Rules can depend on the tenancy, property and local authority. Check the linked official guidance before acting.