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住宅ローン計算機

税金・保険・償却を含む住宅ローンの支払いを計算します。

はじめに

Mortgage Calculator — Home loan payments with taxes, insurance & amortization. Enter Home price, Down payment, APR (%), Term (years), Annual property tax, Annual insurance to get an instant, accurate result.

計算式

Principal = home price − down payment. Monthly principal & interest uses the standard amortization formula; taxes and insurance are added as (annual tax + annual insurance)/12.

ステップごとの説明

  1. Enter the Home price.
  2. Enter the Down payment.
  3. Enter the APR (%).
  4. Enter the Term (years).
  5. Enter the Annual property tax.
  6. Enter the Annual insurance.
  7. Click Calculate to see your result instantly.

実例

Example: With Home price = 400000, Down payment = 80000, APR (%) = 6.5, Term (years) = 30, Annual property tax = 3600, Annual insurance = 1200, the Mortgage Calculator gives Principal: 320000, Principal And Interest: 2022.6177, Tax And Insurance: 400.

よくある質問

Does the total monthly payment include taxes and insurance?
Yes — "total monthly" adds estimated annual property tax and insurance (divided by 12) on top of principal & interest.
How does a larger down payment help?
It reduces the financed principal directly, lowering both the monthly payment and the total interest paid over the loan.
What inputs does the Mortgage Calculator need?
You'll need to provide: Home price, Down payment, APR (%), Term (years), Annual property tax, Annual insurance. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Mortgage Calculator?
The Mortgage Calculator applies the formula exactly as calculated — Principal = home price − down payment. Monthly principal & interest uses the standard amortization formula; taxes and insurance are added as (annual tax + annual insurance)/12. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Are these results guaranteed?
No. The Mortgage Calculator gives an estimate based on the numbers you enter and standard financial formulas — actual rates, fees, taxes, and terms vary by lender, institution, and jurisdiction, and can change over time. This is not financial advice; consult a qualified financial professional for decisions specific to your situation.
Is the Mortgage Calculator free to use?
Yes, the Mortgage Calculator is completely free, requires no signup, and runs instantly in your browser.

住宅ローン計算機について

The Mortgage Calculator uses a real, verifiable formula — Principal = home price − down payment. Monthly principal & interest uses the standard amortization formula; taxes and insurance are added as (annual tax + annual insurance)/12. — so results are accurate every time, not an approximation.