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Tool: Extra Payment Mortgage Calculator — 無料オンライン計算ツール | HomeCalcPro | 印刷日時:
Extra Payment Mortgage Calculator — 無料オンライン計算ツール | HomeCalcPro
Extra Payment Mortgage Calculatorの即時・高精度シミュレーションと計算式。
Parameters & Values
Computed Financial Summary
Real-timeAdjust parameters to update tax and amortization results.
Accelerated Principal Amortization Formula
Transparent mathematical methodology explained in plain English.
Accelerated Paydown: Balance_t = Balance_(t-1) - (Monthly Principal + Extra Principal Payment)Applying extra cash directly to the loan principal immediately reduces the balance against which all future interest is calculated.
Variables Explained:
- Loan Balance ($): Current mortgage principal balance.
- Interest Rate %: Annual mortgage interest rate.
- Extra Monthly Payment ($): Additional principal added to regular monthly payment.
$350,000 Mortgage at 6.75% (30 Years) with $300/Month Extra Principal
Calculating years saved and total interest reduction.
- Total Monthly Payment with Extra: $2,270.08 + $300 = $2,570.08.
- Original Payoff Time: 30 Years (360 Months) with $467,230 interest.
- New Payoff Time: 22 Years 7 Months (271 Months).
- Time Saved: 7 Years and 5 Months faster payoff.
- Total Interest Saved: $146,850 in interest eliminated.
よくある質問 (FAQ): Extra Payment Mortgage Calculator
Click any question below to expand quick answers, formulas, and expert tips.
Do extra mortgage payments always go directly to principal?
You must specify "Principal Only" on your lender’s payment portal to ensure extra funds are not held in escrow or credited toward future interest payments.
Is it better to pay off a mortgage early or invest in the stock market?
If your mortgage interest rate is high (6.5%–7.5%+), paying it down provides a guaranteed, risk-free, tax-free return equal to your mortgage rate.