Rent Increase Calculator

Calculate new rent after increase with CPI comparison and 5-year projection.

By Konstantin Iakovlev · Updated September 2026 · Source: BLS, Consumer Price Index news release (August 2026 data)

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Increase Type
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New Rent

$1,575.00

Increase

$75.00 (5.0%)

Analysis

Monthly Increase$75.00
Annual Increase$900.00
vs CPI1.8% above CPI
Year 1$1,575.00
Year 2$1,653.75
Year 3$1,736.44
Year 4$1,823.26
Year 5$1,914.42

Use the Rent Increase Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only. Results are estimates based on the information you provide and the assumptions described on this page.

How It Works

Rent adjustments hit a budget hard when inflation is in play, and this tool lets tenants and landlords see exactly how an increase plays out. It projects rent five years ahead at the same rate and compares the increase with an inflation rate you enter, so both sides can negotiate from the same set of facts.

Feed in your current rent and the increase, as a percentage or a flat dollar amount, and the calculator shows the new rent, the monthly and annual cost of the increase, and five years of rent compounded at the same percentage. The CPI field is yours to fill in (it starts at 3.2%); for reference, BLS reported that the CPI-U rose 3.4% over the 12 months ending August 2026, and its index for rent of primary residence rose 2.7%. The comparison line is simply the increase percentage minus the CPI rate. The underlying formula is New Rent = Current Rent * (1 + Increase Rate).

CPI is a national average, and your local market can move quite differently from it. Treat it as one input rather than the whole answer, and look into local rent control rules and the typical increases in your own area. The thing most people overlook is how those increases compound across several years, which makes the long-run total larger than a single year suggests.

Example: Apartment Rent Increase Scenario

  1. 1 Step 1: Enter a current rent of $1,500, choose Percentage, enter a 5% increase, and set CPI to 3.4% (the BLS CPI-U change for the 12 months ending August 2026).
  2. 2 Step 2: The increase is $1,500 × 0.05 = $75 a month, so the new rent is $1,575, and the increase costs $75 × 12 = $900 over a year.
  3. 3 Step 3: Compounded at 5% a year, rent reaches $1,653.75 in year 2, $1,736.44 in year 3, $1,823.26 in year 4 and $1,914.42 in year 5.
  4. 4 Step 4: The vs CPI line reads 1.6% above CPI (5% − 3.4%), which is your negotiation point. If the unit is covered by a statewide cap, check the 5% against it too; in Oregon, for example, the 2026 maximum is 9.5%.

Source: BLS, Consumer Price Index news release (August 2026 data) · Last updated: September 2026

Frequently Asked Questions

How much can a landlord raise rent?
In most US states, there is no cap on rent increases for market-rate housing. California, Oregon and Washington set statewide limits for covered rentals: California (Civil Code §1947.12) allows 5% plus the local CPI change, never more than 10% in 12 months, and exempts buildings less than 15 years old; Oregon (ORS 90.323) allows 7% plus CPI, at most 10%, which works out to 9.5% for 2026; Washington (RCW 59.18.700, in effect since May 7, 2025) allows 7% plus Seattle-area CPI, at most 10%, or 9.683% for 2026. Some cities run their own rent-control or rent-stabilization programs.
How much notice does a landlord have to give for a rent increase?
Most states require 30 days notice for month-to-month tenants. Some states require 60-90 days for increases above a certain percentage. Rent cannot be raised during a fixed-term lease unless the lease allows it.
Is a 10% rent increase normal?
A 10% increase is well above the national trend: the CPI index for rent of primary residence rose 2.7% over the 12 months ending August 2026 (BLS). It may be justified in hot rental markets or after years of below-market rent. Where a statewide cap applies, 10% can be over the limit: the 2026 caps are 9.5% in Oregon and 9.683% in Washington, and California's is 5% plus local CPI.

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