Useful next calculations
When to use this calculator
- Before buying, renting, refinancing or reviewing a property investment.
- When you want to compare cash flow, tax, yield or ownership costs.
- When you need a fast estimate before speaking to an agent, lender or adviser.
- When you want to see how a rate or price change moves the result.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Current Monthly Rent ($) | $1,000 |
| Increase (%) | 5% |
For those figures the calculator returns:
- New rent: $1,050.00/month
- Monthly increase: $50.00
- Annual extra: $600.00
Method & assumptions
This calculator helps landlords and tenants understand the financial impact of a proposed rent increase. Enter the current monthly rent and the proposed new amount, or use a percentage-based increase, to see the annual difference and cumulative effect over one to five years. The calculator also shows the equivalent increase expressed as a percentage of CPI to help contextualise whether the rise is broadly in line with inflation. It does not determine whether a proposed increase is lawful or constitutes a fair market rent — that assessment requires knowledge of comparable local rents. For guidance on the correct notice procedure under the Renters Rights Act, including the required notice period and prescribed form, refer to the official government guidance guidance for private landlords.
Common mistakes
- Using an assumption that is not supported by a current local quote, bill, statement or official source.
- Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- Mixing monthly and annual inputs without converting them consistently.
- Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.