California Rent Increase Calculator
Calculate the maximum allowable rent increase under AB 1482 (California's Tenant Protection Act) — 5% + local CPI, capped at 10%.
Did this tool work for you?
How to use this calculator
- 1
Enter your current monthly rent and select your region — AB 1482 uses regional CPI (Consumer Price Index).
- 2
If your landlord has already raised rent in the past 12 months, enter that percentage — the cap applies to the rolling 12-month total.
- 3
AB 1482 applies to most multi-family housing built more than 15 years ago. Many properties are exempt.
- 4
Always check if your local city has stricter rent control — some cities (Los Angeles, San Jose, Oakland) have stronger protections.
Frequently asked questions
What formula does this tool use?
This tool takes the cap as 5% plus a regional CPI figure from a built-in table, limited to a maximum of 10%. It then subtracts any increases you say were already applied in the past 12 months, floors the remainder at zero, and applies it to your current rent. For example, a Fresno rent of $1,800 with 3% already applied has an 8.0% cap, 5.0% remaining and a maximum new rent of $1,890.
Where do the CPI figures come from, and can I change them?
They are fixed values in the code, labelled as 2024 regional CPI estimates for the period April 2023 to April 2024: 3.4% for Los Angeles, 3.7% for the San Francisco Bay Area, 3.8% for Riverside, 3.5% for San Diego, 3.2% for Sacramento, 3.0% for Fresno and 3.3% for other areas. You cannot enter your own CPI, and the table is not updated automatically. The figure that applies to a real notice depends on the rules and the published data, so check the current numbers.
Does the tool check whether my unit is covered?
No. It calculates a cap for any rent you enter. It does not know the building’s age, the type of owner, whether the unit is single-family, or whether a local rent control ordinance applies, any of which could make the result irrelevant. The tool’s own how-to text points out that many properties are exempt, so confirm coverage separately.
How are earlier increases treated?
The tool subtracts the percentage you enter from the cap in simple percentage points, and does not compound them. If you enter 9% and the cap is 8.8%, the remaining allowance is 0.0% and the maximum new rent equals the current rent. Negative entries are treated as zero, so they cannot raise the allowance.
What does the result not include?
It does not handle notice periods, the dates of earlier increases, the timing of the CPI data, fees, security deposits, or what happens when a tenant moves out. It cannot say whether an increase is legal, and it is not legal advice. The tenant, landlord, or a qualified adviser should check the rules and any local ordinance for the actual limit.
What happens if I enter zero rent?
The percentage lines still show the cap and remaining allowance, while the dollar lines show $0.00. A cleared rent box counts as 0 and gives the same result. The tool formats dollars to two decimals without a thousands separator, so a figure like 2168 appears as $2168.00.
Is the maximum shown the amount a landlord must charge?
No. It is the highest amount the tool’s formula allows. A landlord can charge less, and the tool cannot say what is reasonable or typical. Treat the result as a ceiling under the tool’s assumptions, not as an expected or agreed rent.
California Rent Increase Calculator — a cap built from 5% plus a regional CPI
How the cap is computed
The calculator follows the description in the tool: the lesser of 5% plus local CPI or 10%. It picks the CPI from a fixed list of seven regions, adds 5 percentage points, and caps the sum at 10. It then subtracts increases you report for the past 12 months and uses what is left as the maximum percentage. A rent increase notice involves more than this arithmetic: coverage rules, the timing of the CPI figure, and local ordinances all matter, and none of them are in the tool. Its CPI table is a snapshot, not a feed.
The CPI table in the code
The table shows the regional CPI the code assigns to each choice, labelled in the file as 2024 estimates for April 2023 to April 2024, and the cap each one produces before any prior increases are subtracted. None of the seven regions reaches the 10% ceiling. Because the values are hard-coded and not updated automatically, treat them as an example set and check current published CPI figures and rules for your notice.
| Region | CPI in the tool | Cap (5% + CPI) |
|---|---|---|
| Los Angeles–Long Beach–Anaheim | 3.4% | 8.4% |
| San Francisco Bay Area | 3.7% | 8.7% |
| Riverside–San Bernardino | 3.8% | 8.8% |
| San Diego–Carlsbad | 3.5% | 8.5% |
| Sacramento–Roseville | 3.2% | 8.2% |
| Fresno | 3.0% | 8.0% |
| Other / statewide | 3.3% | 8.3% |
Worked example: Los Angeles and the Bay Area
On the default $2,000 rent in the Los Angeles region with no earlier increases, the tool shows an 8.4% allowance, a maximum dollar increase of $168.00 and a maximum new rent of $2168.00. A $2,500 rent in the Bay Area region uses the 3.7% CPI, so the cap is 8.7%, the dollar increase $217.50 and the new rent $2717.50. The two runs differ only in region and rent, which shows how much of the result rests on the CPI figure the tool assigns to each place.
Worked example: increases already applied
Earlier increases use up part of the allowance. A $1,800 Fresno rent with 3% already applied has an 8.0% cap, leaving 5.0%: a $90.00 increase and a $1890.00 maximum. A $3,000 Riverside rent with 9% already applied exceeds the 8.8% cap, so the remaining allowance is 0.0%, the dollar increase is $0.00 and the new rent stays $3000.00. The subtraction uses percentage points as typed, not a compounded figure, so two increases of 3% each should be entered as 6%.
What to check outside the tool
Before relying on any number, confirm that the unit is covered, which depends on facts the tool never asks about, such as the building and the owner. Check whether a local rent ordinance sets a lower limit, and read the notice requirements in the lease and applicable rules. Rules and CPI data change over time, so a result built on a 2024 snapshot should be compared with the current figure. The tool is an arithmetic aid, not legal advice or a statement of what a landlord may lawfully charge.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →