Rent Increase Calculator
Work out a new rent from a percentage increase, or the percentage between old and new rent, with the extra cost per year and an optional cap check.
When a renewal notice arrives, the first questions are how big the increase really is and what it costs over a year. Enter the percentage to get the new rent, or enter the old and new rent to get the percentage. You can also check the new figure against a local cap or a limit in your lease, and see where rent ends up if the same increase repeats.
How to use this tool
- Choose whether you know the percentage or the new rent.
- Enter your current monthly rent.
- Enter the increase in percent, or the new monthly rent.
- Optionally enter the maximum increase your local rule or lease allows.
- Pick how many years to project the same increase.
Formula
New rent = current × (1 + p ÷ 100)
p = (new ÷ current − 1) × 100
p is the increase in percent. Extra rent per year is the monthly increase × 12. The projection compounds: after n years the rent is current × (1 + p ÷ 100)^n.
Example
Rent of $1,500 going up 5% becomes $1,575 a month: $75 more each month and $900 more over a year ($18,900 instead of $18,000). If the same 5% increase came every year, rent would reach about $1,914.42 after five years.
Frequently asked questions
What is a typical rent increase?
It depends heavily on the market and the year. Compare the percentage with recent asking rents for similar units nearby; a large gap gives you a basis to negotiate or to look elsewhere.
Is there a legal limit on rent increases?
Rules depend on the location, property and tenancy. Check the housing agency and lease before entering a cap. This arithmetic comparison does not determine whether the notice is lawful.
Why does a repeated increase grow faster than expected?
Each increase applies to the already higher rent. Five years at 5% raises rent by about 27.6%, not 25%.
This tool gives an estimate for general information only. It is not financial, tax, legal or medical advice — check with a qualified professional before you rely on the result.
Last updated: 2026-10-30