Use our Personal Loan Calculator to estimate monthly payments, interest rates, and total loan costs quickly and accurately.
📊 Calculation Results
📅 Amortization Schedule
| # | Payment | Principal | Interest | Extra | Balance |
|---|
How to Use This Personal Loan Calculator
This tool helps you estimate your monthly payments, total interest, and full repayment timeline for an unsecured personal loan. Simply enter your loan details in the fields on the left, and the calculator updates your results instantly—no button to click required.
Enter the total amount you plan to borrow. This is the principal—the base sum before interest or fees are added.
Choose whether you're entering the term in months or years using the toggle, then input the duration. Shorter terms mean higher payments but less total interest.
Enter the annual percentage rate (APR) you expect to receive. This is the yearly cost of borrowing expressed as a percentage of the loan amount.
Click "Optional: extra payments and fees" to add an origination fee, other upfront costs, or model extra payments that can shorten your payoff time.
After entering your details, review the results panel for your estimated monthly payment, total interest cost, overall loan cost, and payoff timeline. Click "Show Amortization Schedule" to see a month-by-month breakdown of how each payment splits between principal and interest.
The Formula Behind Your Monthly Payment
This calculator uses the standard amortization formula to determine your fixed monthly payment. The equation ensures that each payment covers both the interest accrued that month and a portion of the principal, so the loan is fully paid off by the final payment.
Monthly Payment Formula:
M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ – 1]
Where:
• M = Monthly payment amount
• P = Principal (loan amount)
• r = Monthly interest rate (annual rate ÷ 12)
• n = Total number of payments (term in months)
Understanding Key Terms
| Term | What It Means | Why It Matters |
|---|---|---|
| Principal | The original amount borrowed, before interest or fees. | Interest is calculated on this amount. A larger principal means higher payments and more total interest. |
| Interest Rate (APR) | The annual cost of borrowing, expressed as a percentage. | Directly affects your monthly payment and total interest. Even a 1% difference can change your total cost significantly. |
| Loan Term | The length of time you have to repay the loan. | Longer terms lower monthly payments but increase total interest paid. Shorter terms do the opposite. |
| Origination Fee | An upfront fee charged by the lender, often deducted from your disbursement. | Reduces the net amount you receive but you still repay the full principal. Always factor this into your true cost comparison. |
| Extra Payments | Additional amounts paid beyond the required monthly payment. | Go directly toward reducing principal, which lowers future interest and can shorten your payoff timeline. |
Pro tip: When comparing loan offers, focus on the total cost (principal + interest + fees), not just the monthly payment or advertised rate. A slightly higher payment on a shorter term can save hundreds or thousands in interest over time.
How Extra Payments Accelerate Payoff
Adding extra payments—even small, consistent amounts—can dramatically reduce both the time and total cost of your loan. Because extra payments go directly toward the principal, they reduce the balance on which future interest is calculated, creating a compounding savings effect.
Example Impact of Extra Payments
On a $20,000 loan at 6.5% over 3 years:
| Scenario | Monthly Payment | Total Interest | Payoff Time |
|---|---|---|---|
| Standard payment only | $615 | $2,140 | 36 months |
| + $50 extra/month | $665 | $1,820 | ~31 months |
| + $100 extra/month | $715 | $1,510 | ~27 months |
| One-time $500 extra | $615 | $1,980 | ~34 months |
Before adding extra payments: Confirm with your lender that there are no prepayment penalties. Most modern personal loans allow early payoff without fees, but it's always wise to verify. Also ensure your extra payment is applied to principal, not future interest.
Understanding Your Amortization Schedule
The amortization table shows exactly how each payment is allocated between interest and principal over the life of your loan. This transparency helps you see the long-term impact of your borrowing decisions.
What Each Column Represents
| Column | Description |
|---|---|
| # (Payment Number) | The sequential number of the payment, starting with 1 for your first due date. |
| Payment | The total amount paid that month, including your base payment plus any extra amounts. |
| Principal | The portion of your payment that directly reduces the loan balance. |
| Interest | The portion that covers the interest accrued on the remaining balance for that period. |
| Extra | Any additional amount you specified beyond the required payment. |
| Balance | The remaining loan amount after that payment is applied. |
Notice how early payments are weighted heavily toward interest, while later payments apply more to principal. This is the nature of amortizing loans: interest is always calculated on the current balance, so as the balance shrinks, so does the interest portion of each payment.
Why this matters: If you plan to pay off your loan early, the amortization schedule shows exactly how much interest you'll save by making extra payments at different points in the loan term. The earlier you add extra payments, the greater the long-term savings.
Using This Tool for Smarter Decisions
This calculator is designed to help you compare scenarios and understand trade-offs before committing to a loan. Here are practical ways to use it:
Adjust the term length to see how monthly payments and total interest change. Ask: "Can I afford the payment on a shorter term to save on interest?"
Test different extra payment amounts or frequencies to find a strategy that fits your budget while accelerating payoff.
Add origination or other fees to see how they affect your true cost. A loan with a slightly higher rate but no fees may be cheaper overall.
Use the payoff time result to align your borrowing with financial goals—like being debt-free before a major life event.
Remember: This tool provides estimates based on the inputs you provide. Actual loan terms, rates, and fees depend on your credit profile, lender policies, and market conditions. Always review the full loan agreement before signing.
Frequently Asked Questions
The calculator uses the standard amortization formula to provide mathematically precise estimates based on your inputs. However, actual loan offers may vary due to lender-specific fees, rounding practices, or rate adjustments. Use the results as a planning guide, not a guaranteed quote.
No. This is a standalone educational tool that runs entirely in your browser. No personal information is collected, stored, or shared. Checking your estimated payments here has zero impact on your credit report or score.
Personal loans use fixed-rate amortization: your total monthly payment never changes, but the split between interest and principal shifts each month. Early payments cover more interest because the outstanding balance is higher. As you pay down principal, less interest accrues, so more of each payment goes toward reducing the balance.
Origination fees are typically deducted from your loan disbursement. If you borrow $20,000 with a 3% origination fee ($600), you receive $19,400 but repay the full $20,000 plus interest. This increases your effective borrowing cost. Always compare loans using the total cost (principal + interest + fees), not just the interest rate.
This tool is optimized for unsecured personal loans with fixed rates and terms. While the core math applies to other installment loans (like auto loans), it doesn't account for features unique to mortgages (escrow, PMI), student loans (income-driven repayment), or credit cards (revolving balances). For those, a specialized calculator is recommended.
This calculator assumes a fixed interest rate for the entire term. If you're considering a variable-rate loan, use the rate you expect to start with, but understand that your actual payments could change if the rate adjusts. Variable-rate loans carry more uncertainty—factor that into your decision.
This calculator is for educational and planning purposes only and does not constitute financial, legal, or tax advice. All calculations are estimates based on the inputs provided. Actual loan terms depend on lender approval, creditworthiness, and applicable laws. Review all loan documents carefully before proceeding. No personal data is collected or transmitted.