Loans & borrowing · Free calculator
Principal-Only Payment Calculator
Interactive principal-only payment calculator for payment, interest and borrowing scenario planning.
01 / Set your scenario
Your inputs
02 / Review your estimate
Estimated results
Change the inputs to explore a different scenario.
How to use this estimate
Compare the result with your actual disclosure, statement or payoff quote. Interest methods, payment dates, fees, rounding and allocation rules can change real-world results.
Educational estimate, not financial advice or a loan offer. Inputs run in your browser. See the financial disclaimer.
Use your own loan terms. Results are educational estimates, not lender quotes.
Adjust the inputs, then select Calculate to review your scenario.
Method, assumptions and result checks
What this tool covers: Interactive principal-only payment calculator for payment, interest and borrowing scenario planning.
Review the calculator’s worked examples, formulas, timing and exclusions in the sections below. Input units and payment frequency matter. A displayed APR is not necessarily the interest rate used by the model. Tax, investment, daily-interest and specialist loan models have different rules.
Interface and accessibility reviewed November 8, 2026. This is not a certification of current rates, tax tables or every financial statement. Verify important results against actual documents.
Monthly loan formulas and worked examples · Build questions for your lender
Interactive principal-only payment calculator for payment, interest and borrowing scenario planning.
Learn more about this calculation
Review these related guides before comparing estimates with actual lender terms.
Guides that use this calculator
All guidesPrincipal-Only Loan Payments: How They Affect Interest and Payoff
Practical guide to principal only payment loan, including payment, interest, fees, cash-flow stress testing and a relevant calculator.
LoansPersonal Loan Payment After a Lump-Sum Principal Reduction: Recast Scenario
A practical guide to personal loan payment after lump sum, including payment, fees, break-even math, risks and a relevant calculator.
Loans700 Credit Score and a Larger Loan Offer: Set Your Own Amount
A larger personal-loan offer does not establish the amount you should borrow. Compare the actual expense with the proposed repayment obligation.
LoansBiweekly Auto Loan Payments: Check How Your Lender Applies Extra Cash
Biweekly transfers do not automatically create interest savings if the lender holds partial payments. Compare costs, payment timing, and a worked example.