Loan Amortization Calculator
Enter your loan details to generate a full payment schedule showing principal and interest breakdown for every payment.
| Period | Payment Date | Payment | Principal | Interest | Balance |
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What is a loan amortization schedule?
A loan amortization schedule is a payment-by-payment table that shows exactly how your loan gets paid off over time. Each payment is split into two parts:
- Interest: the cost of borrowing the remaining balance
- Principal: the amount that reduces what you owe
Early in a typical fixed-rate loan, a larger share of your payment goes to interest. Later, more of each payment goes to principal. This shift is the core of amortization.
How this calculator helps
This calculator gives you both summary metrics and a full schedule so you can make smarter borrowing decisions before you sign, refinance, or prepay.
Key outputs
- Regular payment amount
- Total amount paid over the life of the loan
- Total interest cost
- Exact payoff timeline (in periods and years)
- Impact of extra payments each period
How to use the calculator correctly
1) Enter your principal
Use the full amount financed. For a mortgage, this is usually purchase price minus down payment plus financed fees.
2) Enter the annual interest rate
Use your note rate (APR and interest rate are not always the same). This tool uses a fixed nominal annual rate divided by your payment frequency.
3) Select term and frequency
Longer terms reduce each payment but increase total interest. Shorter terms do the opposite.
4) Add optional extra payment
Even a small extra amount can cut years off long-term loans and reduce interest significantly.
Interpreting the amortization table
The schedule helps you answer practical questions, such as:
- How much interest will I pay in the first 12 payments?
- When will my balance drop below a target threshold?
- What happens if I add $50 or $100 extra each payment?
If you compare two scenarios side-by-side (with and without extra payments), the tradeoffs become very clear and highly actionable.
Practical strategies to lower loan cost
Make consistent extra principal payments
Applying extra cash directly to principal lowers future interest calculations, which compounds in your favor over time.
Refinance when rate spreads are meaningful
Refinancing can reduce payment or shorten term, but always compare closing costs, break-even timing, and expected holding period.
Choose a shorter term when affordable
A 15-year schedule can save substantial interest compared with a 30-year schedule, even if monthly cash flow is tighter.
Common mistakes to avoid
- Focusing only on monthly payment instead of total borrowing cost
- Ignoring how payment frequency changes total interest
- Assuming all extra payments are automatically applied to principal
- Not revisiting your plan after income or expense changes
Final takeaway
A loan amortization schedule transforms vague loan terms into concrete numbers you can act on. Use this tool to run scenarios, pressure-test your budget, and build a repayment strategy that aligns with your financial goals.