Free Amortization Calculator Online
Full loan amortization schedule with month-by-month payment breakdown, principal vs interest chart and extra payment savings
About the Amortization Calculator
Amortization reveals a mathematical reality most borrowers don't see until too late: on a 30-year $400,000 mortgage at 7%, your first payment of $2,661 allocates only $328 to principal and $2,333 to interest — 87.7% of your money goes to the bank in month one. By year 15, you've paid $239,000 but still owe $315,000.
Extra payments radically change this equation because every additional dollar goes 100% to principal, eliminating years of future interest. Adding $200/month to a 30-year mortgage at 7% on a $400,000 loan: - Saves $83,000 in interest - Cuts the loan term by 5 years and 4 months - Pays off in 24 years 8 months instead of 30 years
The full amortization schedule this calculator generates shows exactly how your loan balance, interest paid, and principal paid evolve month by month — making the long-term cost of a mortgage tangible.
Refinancing is worth evaluating when rates drop 0.75–1% below your current rate. The break-even on $4,000 in closing costs at $200/month in payment savings is 20 months — refinance makes sense if you'll keep the home beyond that. This calculator's schedule helps compare current vs. refinanced scenarios side by side.
Formula Used
Monthly Payment = P × r × (1+r)^n / [(1+r)^n - 1]
Where P = Principal, r = monthly rate, n = number of payments
When Should You Use This?
The Amortization Calculator is ideally suited for individuals, investors, and finance professionals who need to perform quick, accurate calculations related to general calculations. Use this tool when you need to verify figures, compare different scenarios, or get a precise answer without manual computation errors.
What Does The Result Mean?
The results displayed represent the exact financial figures based on your inputs. Use these numbers to compare different loan, investment, or tax scenarios, keeping in mind that actual bank rates may vary slightly due to processing fees or compounding differences.
Example Calculation
Effect of extra $200/month payment on a 30-year $350,000 mortgage at 6.75%
📥 Inputs
- Loan amount: $350,000
- Interest rate: 6.75% APR
- Term: 30 years (360 payments)
- Extra monthly payment: $200
🔢 Calculation Steps
- 1Standard monthly payment: $350,000 × 0.005625 × 1.005625^360 / (1.005625^360 − 1) = $2,270
- 2Month 1 breakdown: Interest = $350,000 × 0.005625 = $1,969; Principal = $2,270 − $1,969 = $301
- 3With extra $200: month 1 principal = $501 instead of $301 — 66% more principal reduction
- 4Total interest (standard): $467,200 over 30 years
- 5Total interest (with extra $200): $388,900 — saving $78,300 and paying off in 25.4 years
Limitations of this Calculator
- Does not account for sudden changes in variable interest rates or dynamic market conditions.
- Excludes hidden bank fees, processing charges, or specific regional tax surcharges unless explicitly inputted.
- Calculations assume consistent compounding periods without accounting for leap years or non-standard payment dates.
How to Use the Amortization Calculator
- 1Enter your values into the Amortization Calculator input fields above.
- 2Review the input labels to ensure you are using the correct units.
- 3Click the "Calculate" button to get your instant result.
- 4Use the step-by-step breakdown to understand how the result was calculated.
- 5Export or copy your result to use in reports or share with others.
Tips & Best Practices
- Each extra dollar paid goes 100% to principal, saving years of interest. Even $100/month extra on a 30-year mortgage can save $30,000+.
- In early loan years, most of your payment goes to interest — this is why prepayments are most effective at the start.
- Double-check your input units before calculating — using the wrong unit is the most common source of errors.
- Bookmark this Amortization Calculator for quick access next time you need it.
- Use the share button to send your results to a colleague or save them for later reference.
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⚠️ Financial Disclaimer: Results are estimates based on the inputs you provide and standard mathematical formulas. They do not constitute financial advice. Please consult a certified financial advisor, accountant, or tax professional before making any investment, loan, or financial decisions.