What does this calculator do?
The percentage tells you how large a change is relative to your existing rent. The annual difference shows the budget effect if the proposed rent applies for a full twelve months. The projection repeats the same percentage once per year, starting with the proposed rent in year one. It is useful for stress-testing, but it is not a prediction of future renewal offers.
How to use it
- Compare base rent with base rent. Keep new fees and utility changes in a separate list.
- Enter current and proposed rent to see the monthly and annual difference.
- Use a longer period only to explore what repeated increases would mean for your budget.
The math, made clear
Change (%) = (proposed rent − current rent) ÷ current rent × 100A worked example
A change from $1,800 to $1,890 is $90 per month, or 5%. Over twelve months that adds $1,080. If the same 5% change repeats, year-three monthly rent would be $2,083.73.
What to keep in mind
This tool measures a change; it does not determine whether it is permitted. Notice requirements, regulated rents, lease terms, concessions, and local exemptions must be checked separately. Negative changes are supported and represent a rent reduction.
All default values are illustrative. Results are rounded for display; calculations use full precision except where a split must allocate exact cents. Read our methodology for shared definitions and report a calculation issue if a result looks wrong.