Disclaimer: State-cap estimate for a continuing tenancy only; local and emergency restrictions, lease terms, exemptions and notice requirements may prevent an increase.
What is a California Rent Increase Calculator?
A California Rent Increase Calculator estimates the statewide rent ceiling for a continuing tenancy covered by the California Tenant Protection Act. This version applies to increases taking effect from August 1, 2026, through July 31, 2027.
The calculator uses the property’s county group, lowest monthly gross rent during the preceding 12 months, current monthly gross rent, and number of prior increases in the same rolling 12-month period.
Use it only after confirming that the state rent cap applies and that no stricter local rent-control limit applies. It does not decide whether a property or tenancy is legally covered.
How to Use the California Rent Increase Calculator
Review the tenancy, property, local rules, rent history, and proposed effective date before entering the amounts.
Step 1: Confirm Rental Coverage
Select TPA Applies — No Stricter Local Limit only when the tenancy is covered by the California Tenant Protection Act and a lower local cap does not apply.
The calculator will not produce a state-cap estimate if you select local rent control, an exempt or new tenancy, or uncertain coverage. Those situations require a separate review.
Some California cities and counties impose limits below the statewide cap. When a stricter local rule applies, the lower local limit generally controls.
Step 2: Enter the Increase Effective Date
Choose the date on which the proposed increase would begin. The calculator accepts dates from August 1, 2026, through July 31, 2027.
The relevant cap depends on the effective date, not simply the date on which notice is prepared or delivered.
Step 3: Select the Property County Group
Choose the county group containing the rental property. For the supported period, the calculator uses these statewide caps:
- Los Angeles and Orange counties: 8.7%
- Riverside and San Bernardino counties: 8.1%
- San Diego County: 8.2%
- Alameda, Contra Costa, Marin, San Francisco, and San Mateo counties: 8.8%
- All other California counties: 8.6%
These are statewide Tenant Protection Act caps. A city or county rule may impose a lower limit.
Step 4: Enter the Lowest Prior-12-Month Gross Rent
Enter the lowest monthly gross rent charged during the 12 months before the proposed increase takes effect.
Use the gross rent before owner-offered discounts, incentives, or concessions. Do not automatically use the current rent if a lower amount was charged earlier in the rolling 12-month period.
This amount is the base used to calculate the statewide ceiling.
Step 5: Enter the Current Monthly Gross Rent
Enter the current monthly gross rent before discounts. It cannot be lower than the lowest rent entered for the preceding 12 months.
The calculator compares the current rent with the statewide ceiling to determine how much increase may remain under the entered state-limit figures.
Rent affordability is a separate issue from the legal cap. The guide explaining a livable wage in California can help users understand how earnings relate to essential expenses, but it does not determine a permitted rent increase.
Step 6: Enter the Number of Prior Increases
Select zero, one, or two or more prior increases during the same rolling 12-month period.
The calculator reflects the state rule limiting covered rent to no more than two increases during a 12-month period. If two or more prior increases are selected, it displays no remaining increase even when the percentage ceiling has not been reached.
Select Calculate to view the state-cap rent ceiling and remaining increase.
California Rent Increase Formula
The calculator determines the ceiling from the lowest prior-12-month gross rent:
State-cap rent ceiling = Lowest gross rent × (1 + Applicable cap)
Any fractional cent is discarded so the displayed ceiling does not exceed the percentage limit.
The total monthly increase allowed over the base is:
Total increase over lowest rent = State-cap ceiling − Lowest gross rent
The remaining room based on the current rent is:
Remaining increase = State-cap ceiling − Current gross rent
If two increases have already occurred during the rolling 12 months, the calculator sets the remaining increase to zero.
California Rent Increase Calculation Example
Suppose a continuing tenancy has these details:
- Coverage: Tenant Protection Act applies with no stricter local limit
- Effective date: August 15, 2026
- Property location: Los Angeles County
- Lowest gross rent in the preceding 12 months: $2,200
- Current gross monthly rent: $2,300
- Prior increases in the same rolling 12 months: 0
The applicable Los Angeles and Orange county cap is 8.7%.
First, calculate the state-cap ceiling:
$2,200 × 1.087 = $2,391.40
Next, calculate the total increase permitted over the lowest rent:
$2,391.40 − $2,200 = $191.40
Now compare the ceiling with the current rent:
$2,391.40 − $2,300 = $91.40
The calculator will display:
- State-cap monthly rent ceiling: $2,391.40
- Applicable rolling 12-month cap: 8.7%
- Total monthly increase over lowest rent: $191.40
- Remaining monthly increase under state limits: $91.40
- Increase-count check: Below two-increase limit; other rules still apply
These figures exactly match the calculator. The result does not confirm that a $91.40 increase is legally permitted because local restrictions, notice rules, lease terms, emergency orders, or exemptions may change the outcome.
State Cap Versus Local Rent Control
The statewide cap applies to many covered residential properties, but it is not the only rule to check. Several California cities and counties have local rent-stabilization ordinances with lower caps or different calculations.
The calculator intentionally stops when local rent control is selected because applying the statewide percentage could overstate the permitted increase.
Housing costs may be considered alongside broader household expenses using the California Living Wage Calculator. That comparison is for budgeting only and does not affect the legal rent ceiling.
Property Costs Do Not Set the Rent Cap
A landlord’s mortgage, property tax, closing costs, or other ownership expenses do not replace the statutory rent-cap calculation.
The California Property Tax Calculator estimates an annual secured-property tax bill, while the California Mortgage Calculator estimates loan payments. Neither result determines the increase allowed for a covered tenancy.
Similarly, costs estimated by the California Closing Cost Calculator relate to a property purchase rather than a continuing tenant’s allowable rent increase.
Common Mistakes to Avoid
Do not use the current rent as the base when a lower gross rent applied earlier in the preceding 12 months.
Do not reduce the gross-rent base by temporary owner-offered discounts or concessions.
Avoid using the statewide cap without checking local rent control and property exemptions.
Do not ignore earlier increases in the rolling 12-month period. The calculator considers both the cumulative percentage ceiling and the number of increases.
A calculated ceiling is not automatic permission to raise rent. Notice periods, lease terms, local rules, emergency restrictions, and other tenant protections may still apply.
Other California-focused tools are available through California Calculator. Verify current statewide and local limits using the California Attorney General’s official rent-cap guidance before acting.
FAQs
Q1: Which dates does this calculator support?
A: It supports rent increases effective from August 1, 2026, through July 31, 2027.
Q2: What rent amount should I use as the base?
A: Enter the lowest monthly gross rent charged during the preceding 12 months before owner-offered discounts or concessions.
Q3: Can I use the calculator when local rent control applies?
A: No. A stricter local rule requires a separate calculation using the applicable local ordinance.
Q4: What happens if there were already two rent increases?
A: The calculator shows no remaining increase for that rolling 12-month period.
Q5: Does the result confirm that an increase is legal?
A: No. It estimates the statewide cap only and does not decide coverage, notice compliance, exemptions, local restrictions, or lease requirements.