APR Calculator

Calculate the true annual percentage rate including origination fees and other lender charges.

About APR Calculator

This free APR calculator helps you determine the true annual percentage rate on a loan, including all fees. Unlike the nominal interest rate, APR accounts for origination fees, processing fees, and other lender charges, giving you the real cost of borrowing. APR is calculated using a binary search algorithm that finds the interest rate at which the net loan proceeds (after fees) produce the same monthly payment as the nominal rate on the full loan amount.

True Cost of Borrowing

APR includes fees the nominal rate hides, giving you a complete picture of what a loan really costs over its full term.

Fee Comparison

See how origination fees and other charges affect your effective interest rate over the life of the loan.

Rate Difference

Understand the gap between the advertised nominal rate and the true APR you will actually pay.

Free & Instant

No sign-up, no data storage. All calculations run entirely in your browser using industry-standard formulas.

📋 Common Use Cases

Compare Loan Offers

Run multiple scenarios with different interest rates, terms, and down payments. See which lender offer saves you the most money over the full loan period.

Budget for a Major Purchase

Before visiting a dealership or lender, calculate what monthly payment fits your budget. Walk in prepared with realistic numbers and loan terms.

Plan Early Payoff Strategies

Test how extra monthly payments or lump-sum contributions shorten your loan term and reduce total interest paid. Find the fastest path to debt freedom.

Understand Amortization

See exactly how each payment splits between principal and interest over time. Use the amortization schedule to plan refinancing or early payoff decisions.

🪜 How to Use This Tool

  1. Enter the loan details
    Fill in the loan amount, interest rate, and loan term. Some calculators also accept down payment, taxes, and insurance for a complete payment picture.
  2. Adjust advanced settings
    Toggle extra payments, choose payment frequency, or add fees to see how each factor changes your total cost and payoff timeline.
  3. Review payment breakdown
    Your monthly payment, total interest, and total cost appear instantly. Check the amortization table to see how each payment reduces your principal balance.
  4. Export or compare scenarios
    Note your results or run additional scenarios with different inputs. Comparing multiple loan structures helps you negotiate better terms.

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Frequently Asked Questions

Are these calculators really free?▼
Yes. All calculators on iluv.tools are completely free. No signup, no account, no credit card required. Every calculation runs instantly in your browser.
Is my data sent anywhere?▼
Absolutely not. All calculators are pure client-side JavaScript. Your numbers, dates, and inputs never leave your browser. No server processing, no tracking.
How accurate are these calculators?▼
Calculators use standard mathematical formulas with double-precision floating point. Results match industry-standard financial and scientific calculations.
Can I use calculators on mobile?▼
Yes. All calculators work on mobile browsers (iOS Safari, Android Chrome) with responsive layouts.