Whether you are a landlord setting renewal rates or a tenant evaluating a lease renewal, understanding the dollar impact of a rent increase matters. This calculator converts a percentage increase into the new monthly rent, or a proposed new rent into the implied percentage increase — plus the monthly dollar change and cumulative cost over any period. Useful for budgeting, negotiation, and comparing against market comps.
How to use this calculator
- Choose whether you know the increase percentage or the proposed new monthly rent.
- Enter the current monthly rent amount.
- Enter the increase percentage, or the new monthly rent, depending on the mode you selected.
- Set the number of months you want to measure the total impact (default 12 for annual).
- Review the primary result first — new rent from a known percentage, or the implied increase percentage from a known new rent — plus monthly and period cost.
Formula
From a known percentage: New rent = Current rent × (1 + Increase % ÷ 100). From a known new rent: Increase % = ((New rent − Current rent) ÷ Current rent) × 100. In both modes, Monthly increase = New rent − Current rent, and Total increase over period = Monthly increase × Number of months.
Example
A $2,000/month lease with a 5% increase becomes $2,100/month — a $100 monthly increase totaling $1,200 over 12 months. Entering $2,000 current and $2,100 new rent returns the same 5% increase.
Frequently asked questions
Can I calculate the increase percentage from the new rent?
Yes. Choose “I know the new rent,” enter current and proposed monthly rent, and the calculator returns the implied percentage increase, the monthly dollar change, and extra cost over the months you select. This is a math tool only — it does not apply local rent-control caps.
What is a typical annual rent increase?
Market-dependent. Many leases include 3–5% annual escalations. In tight markets, landlords may push higher; in soft markets, increases may be flat or tied to CPI.
Are there legal limits on rent increases?
Rent control jurisdictions (NYC, SF, LA, etc.) cap annual increases. Check local ordinances — some require 30–90 days notice and limit increases to CPI-linked amounts.
How do I negotiate a rent increase?
Research comparable units, highlight your payment history and property care, propose a smaller increase, or negotiate longer lease terms in exchange for a lower rate.
Does this model CPI-linked increases?
Enter the CPI percentage as the increase rate manually. This calculator applies a single-step increase — it does not model compounding or staggered escalations unless you run multiple scenarios.