About the Loan Calculator
Whether the loan is a personal loan, a debt-payment consolidation loan, an equipment loan or something else fixed-rate, the same construct applies: a level payment, a level rate, and an amortizing balance. This tool answers the three questions every borrower has: what it costs monthly, what interest totals, and how expensive the money is in the end.
The total-interest figure is the one to interrogate — two loans can quote nearly the same payment with dramatically different lifetime cost depending on term and rate.
The formula behind it
Standard amortizing-payment formula:
M = P × r × (1+r)^n / ((1+r)^n − 1)P is the amount financed, r = APR/12 per month, n = term in months. Total interest for the loan = M×n − P. The payment stays fixed every month; only the interest slice inside it changes as the balance falls.
Worked example
With the default inputs above:
- $20,000 at 7.5% APR for 5 years produces a payment of about $400.76.
- Over 60 payments, you would pay $24,045.60 in total.
Takeaway: That is $4,045.60 of interest — about 20% of the amount borrowed, entirely for the privilege of having the money sooner.
What moves the result
- APR — every 1% of rate adds roughly 2.6% to total interest on a mid-length loan.
- Term — stretching 5 years to 7 lowers the payment but typically raises total interest by 15–20%.
- Fees — origination charges are often deducted up front or financed; read what the APR includes (page apr-calculator explains it).
- Credit profile — a better tier can swing personal-loan APRs by 10+ points between offers.
Practical tips
- Line up the APR on every offer, not the payment — APR normalizes for fees and makes offers comparable.
- Shorten the term rather than stretching the loan when a payment is still affordable; the total interest column will make the case.
- Check for prepayment penalties before signing. Selling at month 20 with a balloon restriction varies widely by lender.
- If the loan includes an autopay discount, verify the quoted APR already includes it.
- Model the payoff of a bank-loan with this tool and the credit-card-payoff calculator alongside each other when choosing which debts to consolidate.
Frequently asked questions
What interest rate is realistic for me?
It depends mostly on your credit tier. As a rough anchor, mid-tier personal loans commonly price in the 8–15% band; subprime offers can exceed 30%. Shop offers and use real quotes, not guesses.
Does this calculator work for a line of credit?
Only if you would convert the outstanding balance into a fixed amortizing payment. Revolving credit behaves differently.
Why does the tool call this “total finance charge” sometimes missing fees?
The payment formula here bills interest only. Optional origination fees are excluded by default — the APR calculator handles fee-inclusive comparisons.