CPI Rent Increase Calculator

How this calculator works

The calculator applies the entered increase percentage to the current monthly rent. It shows the new monthly rent, monthly change, annual rent before, and annual rent after so the increase is visible beyond one payment.

When to use this page

Use it to check renewal offers, rent notices, budget changes, CPI-linked clauses, scheduled increases, or before-and-after rent math before you decide whether to move, negotiate, or ask for clarification.

What this result does not include

This is arithmetic only. It does not decide whether a rent increase is allowed, whether notice is valid, whether a unit is exempt, whether local caps apply, or whether fees and utilities can change separately.

• Check whether the amount is a fixed increase, percentage increase, CPI-linked increase, or scheduled escalation.
• Confirm whether the rent amount excludes separate fees, utilities, parking, or service charges.
• For regional pages, verify current official rules before using the result in a dispute or notice response.

How to read the result

The monthly change shows the immediate payment impact. The annual before-and-after amounts show the full-year impact, which is usually the better number for deciding whether a renewal offer, CPI adjustment, or escalation clause fits your budget. If rent is paid weekly, fortnightly, or every 4 weeks, convert the new monthly rent before comparing payment-cycle cash flow.

Before acting on an increase

Use the calculator to check the arithmetic, then compare the result with the lease clause or rent notice. A correct percentage calculation does not prove that the increase is permitted or that every required notice step was followed.