Calculate Your California Property Tax
The California property tax calculator estimates annual and monthly property taxes by multiplying the property’s assessed value by its total tax rate.
Property assessed value: $[__________]
Total property tax rate: [____]%
Estimated annual property tax: $[__________]
Estimated monthly amount: $[__________]
To use the California property tax calculator:
- Enter the assessed value shown on the latest county assessment notice or property tax bill.
- Enter the total tax rate for the property’s tax-rate area, including voter-approved debt.
- Multiply the assessed value by the rate expressed as a decimal.
- Divide the annual estimate by 12 to calculate a monthly budgeting amount.
The California property tax calculator should not use the purchase price or current market value if the county has established a different taxable assessed value. If you are unsure which amount applies, check the records maintained by the county assessor or tax collector.
These inputs determine how to interpret the calculator’s results.
Understand the Calculator Results
The California property tax calculator result is an estimate of the property’s annual tax and its monthly budgeting equivalent.
The assessed value is the taxable value maintained by the county assessor. The total tax rate combines California’s general 1% property tax limit with applicable voter-approved debt.
The California Board of Equalization, the state authority responsible for property tax oversight, explains that additional assessments may also appear on a tax bill.
The California property tax calculator groups possible estimates into three practical ranges:
- Low estimate: Uses only the 1% general levy and excludes local debt, direct assessments and special charges.
- Middle estimate: Uses the actual percentage rate for the property’s tax-rate area but excludes fixed-dollar charges.
- High estimate: Adds known direct assessments or parcel charges to the percentage-based calculation.
The California property tax calculator does not predict supplemental bills, penalties, exemptions, assessment appeals or future local measures. It also does not calculate mortgage escrow requirements.
These limits lead directly to the calculation methodology.
Methodology, Formula and Sources
The California property tax calculator applies a percentage-based formula to the assessed value supplied by the user.
Formula:
Estimated annual property tax = assessed value × total tax rate ÷ 100
Estimated monthly amount = estimated annual property tax ÷ 12
The California property tax calculator rounds displayed dollar amounts to the nearest cent. It does not round the assessed value or tax rate before applying the formula.
California Proposition 13 generally limits the base property tax rate to 1% of assessed value, plus amounts needed for qualifying voter-approved debt. It also generally limits annual increases in assessed value to the lower of inflation or 2%.
However, a change in ownership or completed new construction can trigger reassessment. The California Board of Equalization is the primary state authority for these property tax rules.
County authorities administer assessments and bills. For example, a property in Alameda County must use the applicable Alameda County records, while a property in Contra Costa County must use the records and tax-rate area assigned there.
Rates from Boulder County, Cook County, Cobb County, Collier County, Collin County or Comal County do not apply because those counties are outside California.
Source and update date: The California property tax calculator methodology was reviewed against California Board of Equalization property tax guidance on August 8, 2026. Local rates and assessments can change, so verify the current figures with the responsible county authority.
The following worked example shows how the formula operates.
Worked Example
The California property tax calculator can check a hypothetical $625,000 assessed value using an estimated total rate of 1.18% supplied by the user.
The California property tax calculator performs these steps:
- Convert 1.18% to a decimal:
1.18 ÷ 100 = 0.0118. - Multiply the assessed value by the decimal rate:
$625,000 × 0.0118 = $7,375. - Divide the annual estimate by 12:
$7,375 ÷ 12 = $614.58.
The California property tax calculator therefore returns an estimated annual property tax of $7,375 and a monthly budgeting amount of $614.58. The 1.18% rate is an estimate used for illustration, not a published rate for any named city or county.
If the actual bill includes a fixed $300 parcel assessment, the California property tax calculator’s percentage-based result remains $7,375. The broader planning total becomes $7,675 after adding that known charge separately.
This example provides context for the inputs and limitations covered in the following result checks.
Check Accuracy, Assumptions and Privacy
The California property tax calculator is accurate only when its assessed value and total rate match the property’s current county records.
Is this an official California government calculator?
No. The California property tax calculator is an independent planning tool.
It is not operated or endorsed by the State of California, the California Board of Equalization or any county agency.
Does the calculator account for California Proposition 13?
The California property tax calculator uses the assessed value entered by the user, so it can reflect California Proposition 13 only if that input already incorporates the county’s assessment rules. It does not independently reconstruct the property’s assessment history.
Can I use the purchase price as the assessed value?
The California property tax calculator can use a purchase price for an early planning estimate, but the county assessor determines the taxable assessed value. A recent purchase may also generate a supplemental assessment that this basic calculation does not include.
Does the calculation include exemptions and special assessments?
No. The California property tax calculator does not automatically subtract exemptions or add fixed-dollar parcel charges, special assessments and penalties.
Review the actual county bill for those items.
Is my information private?
The California property tax calculator described here requires only an assessed value and tax rate. Do not enter an address, Social Security number, bank information or other sensitive data into these fields.
What should I do before paying or appealing?
Use the California property tax calculator to establish an estimate, then compare its assessed value, rate and added charges with the county bill. Contact the county assessor about valuation and exemptions.
Contact the county tax collector about billing and payment. That comparison turns the opening estimate into an informed next decision.