Personal Loan Calculator: Payment and Total Interest
Estimate the scheduled payment and total financing cost for a fixed-rate personal loan.
Inputs and calculation method
- Loan amount
- APR
- Repayment term
- Origination fee or other financed charges
The calculator applies the standard fixed-payment amortization formula to the amount financed. Fees paid separately should be compared with fees withheld from proceeds or added to principal.
Core formula: Payment = P × r × (1 + r)^n ÷ ((1 + r)^n − 1).
How to interpret the estimate
Two loans with the same payment can have different costs if one has a longer term, higher fee, or less cash delivered after an origination charge.
Change one assumption at a time to understand which input has the greatest effect. Use exact figures from a lender disclosure, statement, pay record, account terms, or business records whenever possible. Calculator output is rounded and may differ from institution-specific calculations.
How to use this calculator effectively
Compare offers with the same amount and time horizon. Include fees and the cash actually received, not only the advertised rate.
Use this calculator to compare fixed-payment personal-loan offers on the same principal and term. Enter the amount you will actually receive and separately account for origination fees that may be deducted from proceeds or added to the balance. The strongest comparison uses APR, monthly payment, total repayment, and net cash delivered.
- Step 1: Loan amount. Use a value from a current statement, written quote, account record, or documented plan whenever possible.
- Step 2: APR. Use a value from a current statement, written quote, account record, or documented plan whenever possible.
- Step 3: Repayment term. Use a value from a current statement, written quote, account record, or documented plan whenever possible.
- Step 4: Origination fee or other financed charges. Use a value from a current statement, written quote, account record, or documented plan whenever possible.
What changes the result most
- Principal: borrowing more than the amount needed increases both payment and total interest.
- APR and fees: origination charges can make a loan with a lower stated rate more expensive overall.
- Term: a longer term lowers the required payment but usually increases interest and keeps the obligation active longer.
- Prepayment terms: the ability to pay early without penalty can matter when income or refinancing plans may change.
Practical decision guide
Collect written quotes within a short shopping period and compare them with identical loan amounts and terms. Check whether the payment fits the budget after existing obligations and whether the loan solves a one-time need or merely moves recurring overspending. For consolidation, model the old debts and the proposed loan using the same payoff horizon.
Questions to ask before relying on the result
- Which input is documented and which one is only an assumption?
- How does the result change under a more conservative rate, cost, payment, or time horizon?
- What cash-flow, risk, tax, legal, or contractual factor is not represented by the formula?
Common mistakes to avoid
- Using the interest rate instead of APR when fees are included in the offer.
- Entering the face amount while ignoring that a fee may reduce the cash received.
- Selecting a longer term solely to reach a preferred payment.
- Borrowing to clear cards and then rebuilding the card balances.
Limitations and how to verify the estimate
The estimate does not determine qualification, credit pricing, fee treatment, late charges, optional insurance, or exact lender rounding. Use the final disclosure for the contractual cost.
Recheck the calculation when an input changes and compare the output with the applicable statement, disclosure, contract, plan document, or official source. Do not use a calculator result as a substitute for individualized financial, tax, legal, lending, investment, insurance, payroll, or accounting advice.
Save the date, inputs, and purpose of each scenario. That record makes later comparisons more reliable and helps explain why a result changed. When comparing alternatives, use the same measurement period and cost definitions; otherwise a seemingly better result may come from inconsistent assumptions rather than a genuine financial advantage.
Official references and further reading
- Consumer Financial Protection Bureau: Consumer tools — Official educational resources for comparing borrowing products and understanding disclosures.
Frequently asked questions
What is an origination fee?
It is a lender charge that may be deducted from proceeds or added to the financed amount. Compare the cash received with the amount repaid.
Can the APR change?
Fixed-rate loans generally keep the stated rate, while variable-rate products can change according to their terms.
Does the result guarantee approval?
No. Approval, rate, and amount depend on lender underwriting and the borrower’s application.
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Last technical review: June 26, 2026. Methodology is provided for transparency. This calculator is educational and does not provide financial, tax, legal, investment, lending, insurance, or accounting advice. Read the methodology and calculator disclaimer.