Rent Increase Calculator

Background.

The practical question behind Rent Increase Calculator is whether you can express a proposed rent change as dollars and a percentage of current rent. In this context, rent-increase percentage uses current contract rent as the base; it does not measure market rent or tenant affordability. The calculator therefore applies “rent increase percentage = (proposed monthly rent - current monthly rent) / current monthly rent.”

The editable entries are current monthly rent, proposed monthly rent. Use values from the document or measurement that governs this rent increase question; the defaults are only the worked fixture below. Notice periods, caps, renewal timing, subsidy rules and local rent regulation determine whether an increase is lawful. That rent increase boundary is part of the answer, not a generic disclaimer.

Fannie Mae Selling Guide B3-3.1-08, Rental Income; documented gross and net rental-income treatment documents the convention or governing rule used here. The rent increase output is a transparent scenario under those facts: it does not manufacture an unentered market price, professional determination, carrier quote, legal eligibility finding or locally adopted code value.

What is rent increase calculator?

Rent Increase is the relationship behind this decision: rent-increase percentage uses current contract rent as the base; it does not measure market rent or tenant affordability. On this page it means rent increase percentage = (proposed monthly rent - current monthly rent) / current monthly rent. Notice periods, caps, renewal timing, subsidy rules and local rent regulation determine whether an increase is lawful; that is the line between the reported quantity and a broader real estate analysis.

How to use this calculator.

1. 01Confirm that “rent increase percentage = (proposed monthly rent - current monthly rent) / current monthly rent” matches the rent increase convention you need.
2. 02Replace the fixture values for current monthly rent, proposed monthly rent with dated values from the governing record.
3. 03Keep all currencies, measurement units and time periods on the same basis before calculating.
4. 04Read rent increase together with this boundary: Notice periods, caps, renewal timing, subsidy rules and local rent regulation determine whether an increase is lawful.

The formula.

The calculation uses rent increase percentage = (proposed monthly rent - current monthly rent) / current monthly rent. In this rent increase model, the entered terms are current monthly rent, proposed monthly rent. Rent-increase percentage uses current contract rent as the base; it does not measure market rent or tenant affordability, which is why the relationship is presented under this name rather than as a universal alternative. Notice periods, caps, renewal timing, subsidy rules and local rent regulation determine whether an increase is lawful. Calculations keep full decimal precision through the relationship and round only the returned display values.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Fannie Mae Selling Guide B3-3.1-08, Rental Income; documented gross and net rental-income treatment. Retrieved 2026-08-07. access: open unless marked otherwise.
2. [2]Freddie Mac, Modeling Multifamily Potential Rental Income; current rent roll, concessions and vacancy treatment. Retrieved 2026-08-07. access: open unless marked otherwise.
3. [3]National Association of Realtors. Research and statistics. Retrieved 2026-08-07. independence: secondary-check; access: open.