Calculate rent increase

Compare a proposed monthly rent with the current amount as both a percentage and a yearly cash difference.

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ToolRent Increase Calculator
Input
Output
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How it works

A percentage proposal multiplies current monthly rent by one plus the percentage divided by 100; a target proposal instead uses the entered monthly amount directly. The difference is multiplied by 12 for a full-year effect, and exactly one proposal method must be supplied because combining them would be ambiguous.

Formula
new monthly rent = current monthly rent × (1 + percentage ÷ 100)
annual difference = monthly difference × 12
  • A target below current rent produces a negative percentage and annual difference rather than being relabeled as an increase.
  • The arithmetic does not decide whether a proposed amount is lawful or reflects open-market rent.

Worked example

A 1,000 rent raised by 5%
Input
											Current monthly rent: 1000
Increase percent: 5
Output
												New monthly rent: 1050
Monthly difference: 50
Annual difference: 600
Effective increase percent: 5

When to use this

In England, Form 4A notices under the section 13 process state a proposed monthly rent; tenancy-renewal discussions and household annual budgets also compare that amount with the rent currently paid.

Edge cases

  • Entering both a percentage and a target amount is rejected because they can imply different new rents.
  • A target below the current amount remains a negative change, which supports negotiated reductions as well as rises.
  • The result compares 12 full months at each amount; a change starting partway through a year needs a separate prorated budget.

References