ローン計算ツール
返済額、利息、返済スケジュールを計算
この電卓は情報提供のみを目的とした概算を提供します。実際の結果は異なる場合があります。個別のアドバイスについては、ファイナンシャルアドバイザーにご相談ください。
Payment Breakdown
Balance Over Time
This calculator provides estimates for informational purposes only. Actual loan terms,rates, and payments may vary. Consult a financial advisor for personalized advice.
出典と方法論
M = P[r(1+r)ⁿ] / [(1+r)ⁿ-1]Loan amortization formula
How to Use the Loan Calculator
What is a Loan Calculator?
A loan calculator is a financial tool that computes your monthly payment, total interest paid, and overall cost of borrowing money. Whether you're financing a car, consolidating debt, or funding a home improvement project, understanding your loan payments before you borrow helps you make informed financial decisions.
The Loan Payment Formula
Loan payments are calculated using the standard amortization formula:
M = P × [r(1+r)^n] ÷ [(1+r)^n - 1]
Where:
- M = Monthly payment
- P = Principal (loan amount)
- r = Monthly interest rate (annual rate ÷ 12)
- n = Total number of payments (years × 12)
For example, a $25,000 loan at 7% for 5 years: Monthly payment = $495.03, Total interest = $4,701.80
Real-World Loan Examples
- Auto Loan: $30,000 at 6.5% for 60 months = $586/month, $5,160 total interest
- Personal Loan: $10,000 at 10% for 36 months = $323/month, $1,628 total interest
- Student Loan: $50,000 at 5% for 120 months = $530/month, $13,640 total interest
- Home Improvement: $15,000 at 8% for 48 months = $366/month, $2,568 total interest
- Debt Consolidation: $20,000 at 12% for 60 months = $445/month, $6,700 total interest
How Interest Rates Affect Your Loan
Even small rate differences have a major impact on total cost:
- $25,000 at 5% for 5 years: $472/month, $3,307 total interest
- $25,000 at 7% for 5 years: $495/month, $4,702 total interest
- $25,000 at 9% for 5 years: $519/month, $6,138 total interest
The difference between 5% and 9% is $2,831 in extra interest—a 15% higher cost!
Loan Term Trade-offs
Shorter terms mean higher monthly payments but less total interest:
- 3-year term: Higher payments, lowest total cost
- 5-year term: Balanced payments and total cost
- 7-year term: Lower payments, but significantly more interest paid
Types of Loans
- Secured Loans: Backed by collateral (auto, home), typically lower rates
- Unsecured Loans: No collateral required, higher rates
- Fixed-Rate: Same rate throughout the loan term
- Variable-Rate: Rate can change based on market conditions
Extra Payments Save Money
Making extra payments reduces principal faster, saving interest. On a $25,000 loan at 7% for 5 years, adding just $50/month extra:
- Pays off the loan 8 months early
- Saves $590 in interest
Related Calculators
For specific loan types, try these specialized tools:
- Mortgage Calculator – Home loans with taxes, insurance, PMI
- Auto Loan Calculator – Vehicle financing with trade-in values
- Amortization Calculator – Full payment schedules
- Compound Interest Calculator – See how savings grow
About Our Calculations
Our loan calculator uses the standard amortization formula used by banks and financial institutions. Rates shown are for illustrative purposes—your actual rate depends on credit score, income, and lender policies. We display current Federal Reserve reference rates but always recommend getting quotes from multiple lenders.
よくある質問
The formula is: M = P[r(1+r)^n]/[(1+r)^n-1], where M is payment, P is principal, r is monthly interest rate, and n is number of payments. For a $25,000 loan at 5% for 5 years: monthly payment is $471.78. Our calculator handles this automatically.
Good personal loan rates range from 6-12% for borrowers with excellent credit (720+). Average rates are 12-18% for good credit. Rates above 20% are high. Your rate depends on credit score, income, debt-to-income ratio, and lender.
Lenders typically limit total debt payments to 36-43% of gross monthly income. If you earn $5,000/month with existing debts of $500, you could afford roughly $1,300-$1,650 in total monthly payments, including the new loan payment.
Shorter terms have higher monthly payments but save significantly on interest. A $20,000 loan at 7% costs $3,761 in interest over 3 years vs. $7,579 over 5 years. Choose shorter terms if you can afford the payments; longer if you need payment flexibility.
Interest rate is just the cost of borrowing. APR (Annual Percentage Rate) includes the interest rate plus fees like origination fees and closing costs, giving you the true annual cost of the loan. Always compare APRs when shopping for loans.
Extra payments go directly to principal, reducing the balance that accrues interest. Paying $50 extra monthly on a $20,000 loan at 7% for 5 years saves $763 in interest and pays off the loan 8 months early.
最新情報を入手
新しい計算機とヒントをメールで受け取りましょう。