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California Mortgage Calculator

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This California mortgage calculator helps buyers budget principal, interest, and housing costs in CA. Enter purchase price, down payment, and rate, then add property tax and insurance—California property taxes use Proposition 13 baselines that vary by county and purchase year.

California buyers often face high list prices and competitive markets—budget on full PITI, not P&I alone.

Supplemental tax bills may apply after purchase; first-year tax estimates can differ from seller's current bill.

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Your data never leaves your computer.

How to use this tool

Enter California home price, down payment, rate, and term. Use county tax rate or recent bill for annual property tax; add insurance quote for coastal or wildfire-prone areas.

Worked example

Example: $750,000 home in CA with $150,000 down, 6.5% rate, 30-year term, $9,000/year tax (~1.2%), and $2,400/year insurance gives roughly $3,792/month P&I plus about $950/month for tax and insurance—near $4,742 total.

When to use this

  • Shopping in Bay Area, LA, San Diego, or Sacramento metros.
  • Comparing coastal vs inland tax and insurance costs.
  • Explaining Prop 13 reassessment on purchase to relocators.

Common examples

  • Buying a $350,000 home with 20% down ($70,000), 6.5% APR, 30 years, $4,200/year tax and $1,800/year insurance → principal and interest near $1,770/month; total housing payment near $2,270/month before PMI.
  • Buying a $500,000 home with 10% down ($50,000), 7% APR, 30 years, $6,000/year tax, $2,400/year insurance, and $150/month HOA → P&I near $2,994/month; estimated total near $3,844/month.
  • First-time buyer: $275,000 home with 5% down ($13,750), 6.75% APR, 30 years, modest tax and insurance → P&I near $1,694/month; total near $2,094/month—PMI often applies below 20% down.
  • $425,000 home with 15% down, 6.75% APR, 30 years → P&I near $2,350/month before tax and insurance.
  • Refinance scenario: $280,000 remaining balance at 5.9% for 25 years → compare to current 6.5% payment on the same balance.

What people search for

Common mistakes

  • Using seller's low assessed value instead of purchase price for tax estimate.
  • Underestimating earthquake or wildfire insurance riders.
  • Ignoring Mello-Roos or special assessments in some communities.

Related long-tail tasks

  • los angeles mortgage payment estimate
  • bay area affordability check
  • california first time buyer budget

How it works

Enter the home price, down payment, interest rate, and term. The calculator derives the loan amount and uses the standard amortizing loan formula for principal and interest. Optional annual property tax, home insurance, and monthly HOA fees are added to estimate a total monthly payment. Fees, PMI, and taxes beyond your inputs are not included.

Limitations

Monthly payment estimates exclude HOA, PMI changes, escrow adjustments, and property tax reassessments. Not a loan offer or pre-approval.

Privacy and file handling

Your data is processed in your browser and is not uploaded to our server.

Accuracy & methodology

This section documents how the calculator works, what it leaves out, and when results were last reviewed. Figures are educational estimates—not professional advice—and are not labeled "current" unless tied to automatically updated reference data.

Formula source or methodology
Loan amount = home price − down payment. Monthly principal & interest uses the standard amortizing loan payment formula (same as loan calculator). Optional annual property tax, insurance, and HOA are divided by 12 and added to P&I for total monthly housing payment.
Jurisdiction
General mortgage math (not country-specific underwriting rules)
Unit system
Currency for price, down payment, tax, insurance, HOA; years for term; percent for rate
Rounding method
Currency amounts round to two decimal places (half up via Math.round × 100 / 100).
Assumptions
  • Fixed annual interest rate for the full term
  • Level monthly payments (fully amortizing)
  • Down payment is a dollar amount, not a separate percent field
Known omissions
  • Not tax, legal, investment, or lending advice. Confirm material decisions with qualified professionals.
  • Origination fees, points, PMI/MIP, and lender-specific charges unless a field exists
  • Property taxes, insurance, and HOA unless explicitly entered
  • Prepayment penalties and variable or adjustable rates after the initial period
  • Tax deductibility of interest
Test cases (automated)
  • Typical home price, down payment, rate, and term return positive P&I and total interest
  • Down payment greater than home price is rejected
Version & last verified

Logic version 1.0. Content and formulas last verified .

Important notice

Results are estimates for educational purposes and are not financial advice. Taxes, insurance, HOA fees, and lender-specific costs may not be included. Consult a qualified financial professional for personal guidance.

Related Mortgage Calculator guides

These pages use the same mortgage calculator with guides tailored to specific search intents.

Frequently asked questions

Prop 13 and new purchases?

Tax is often reassessed near purchase price—do not rely on the seller's old assessed value alone.

Earthquake insurance?

Standard HO policies may exclude earthquake—factor separate coverage if required in your area.

Same math as other states?

Loan amortization is standard; California-specific tax and insurance inputs make the estimate local.

Related tools

Related pages

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