APR vs Interest Rate Calculator
See the true cost of any loan after origination fees — the rate you are quoted is not always the rate you pay
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APR vs Interest Rate Calculator
What Is Your Loan Really Costing You?
The true APR (effective APR) is calculated using Newton’s method, finding the rate that equates your payment stream to the amount you actually received after fees.
Key Takeaways
- A $10,000 personal loan quoted at 9.99% with a 5% origination fee has a true APR of approximately 13.4% — over 3 percentage points higher than the advertised rate.
- The origination fee is deducted upfront, so you receive $9,500 but pay interest on the full $10,000. The true APR reflects what you are actually paying on the money you received.
- Shorter loan terms amplify the fee impact: the same 5% fee adds about 5.5 points to the APR on a 12-month loan but only 2.2 points on a 60-month loan.
- The spread bar visually shows how much of your true cost comes from the quoted rate versus the fee markup — making it immediately clear when a fee is adding significant hidden cost.
- If your origination fee is 0%, the quoted rate equals the true APR. Lenders like SoFi, LightStream, Marcus, and Discover charge no origination fee.
How to Use This Calculator
This calculator reveals the gap between a loan’s advertised interest rate and its true annual percentage rate (APR) after accounting for origination fees. It answers the question every borrower should ask: “What am I really paying?”
Step 1 — Enter the loan amount. This is the face value of the loan — the amount on your offer letter. The calculator will show how much you actually receive after the fee is deducted.
Step 2 — Enter the quoted interest rate. This is the rate the lender advertises or includes in your pre-qualification. It does not include fees. The default of 9.99% represents a competitive personal loan rate for borrowers with good credit.
Step 3 — Enter the origination fee percentage. Most personal loan lenders that charge fees set them between 1% and 8%. The default of 5% is a common midpoint. If your lender charges no fee, set this to 0% and the quoted rate will equal the true APR.
Step 4 — Choose the loan term. The term affects how much the fee inflates the APR. Shorter terms amplify the fee impact because the upfront cost is spread over fewer months. The “Fee Impact by Loan Term” table at the bottom shows the true APR at five different terms so you can see this effect clearly.
Understanding the Results
The two large numbers at the top tell the whole story: the quoted rate on the left is what the lender advertises; the true APR on the right is what you actually pay. When there is no fee, these numbers match and the effective APR card turns green. When a fee exists, the true APR is higher and the card turns red to signal the markup.
The spread bar below provides an intuitive visual. The navy segment represents the quoted interest rate; the red segment represents the additional cost from the origination fee. On a 9.99% loan with a 5% fee, roughly a quarter of the total bar is red — meaning the fee adds about 25% to the true cost of the loan beyond the quoted rate.
The “Cost Per Dollar Borrowed” metric is unique to this calculator. It shows how many cents you pay in total cost (interest plus fee) for every dollar you actually receive. On the default scenario, this is about $0.22 — meaning for every dollar you get, you pay 22 cents in borrowing cost. This is the most intuitive way to compare loan efficiency across different amounts and terms.
The Fee Impact by Loan Term table shows the true APR at five different terms with the same rate and fee. The current term is highlighted. This reveals a key principle: the shorter the term, the more damage the fee does to your effective rate. A 5% fee on a 12-month loan adds about 5.5 percentage points to the APR; on a 60-month loan, it adds only about 2.2 points. This happens because the fee is a one-time upfront cost that gets “amortized” over the loan’s life — more months means less impact per month.
APR vs Interest Rate: What Is the Difference?
| Feature | Interest Rate | APR (Annual Percentage Rate) |
|---|---|---|
| What it measures | Cost of borrowing the principal | Total annual cost including fees |
| Includes fees? | No | Yes (origination, closing costs) |
| Which is higher? | Always ≤ APR | Always ≥ interest rate |
| Required by law? | No federal mandate to disclose alone | Yes — TILA requires disclosure |
| Best for comparing? | Only if both loans have identical fees | Always — apples-to-apples comparison |
| Equal when? | When there is no origination fee (SoFi, LightStream, Marcus, Discover) | |
Frequently Asked Questions
What is the difference between APR and interest rate?
The interest rate is the annual cost of borrowing the principal amount. The APR includes the interest rate plus any mandatory fees (primarily the origination fee for personal loans), expressed as an annualized percentage. APR is always equal to or higher than the interest rate. When a lender charges no fees, the two are identical.
Why is the true APR higher than the quoted rate?
Because the origination fee reduces the amount you receive while keeping your payment the same. On a $10,000 loan at 9.99% with a 5% fee, you receive $9,500 but make payments calculated on $10,000. The true APR reflects the actual annual cost relative to the $9,500 you received — which works out to about 13.4%.
How is the effective APR calculated?
The calculator uses Newton’s iterative method to find the annual rate that would produce the same monthly payment on the disbursed amount (loan minus fee) as the quoted rate produces on the full loan amount. This is the same method lenders use to compute the APR they are required to disclose under TILA.
Does the fee impact change with the loan term?
Yes, significantly. The same fee adds more to the APR on shorter terms. A 5% fee on a 12-month $10,000 loan adds about 5.5 points to the APR. On a 60-month loan, the same fee adds only about 2.2 points. The “Fee Impact by Loan Term” table in the calculator shows this effect for five different terms.
Should I avoid loans with origination fees?
Not automatically. Some fee-charging lenders offer lower interest rates that offset the fee — especially on longer terms. The right question is not whether there is a fee, but whether the total cost (interest plus fee) is lower than a no-fee alternative. Use our Loan Comparison Calculator to compare two specific offers.
What is a typical origination fee for personal loans?
Origination fees typically range from 1% to 8% of the loan amount. Lenders like Upgrade, Prosper, and Best Egg charge fees. Lenders like SoFi, LightStream, Marcus, and Discover charge no origination fee. Our fee comparison guide lists fees by lender.
References & Further Reading
- CFPB — Interest Rate vs APR
- CFPB — Regulation Z (Truth in Lending)
- Federal Reserve G.19 — Consumer Credit
Keep Reading
- Personal Loan Fees Explained — Fee comparison by lender
- Loan Comparison Calculator — Compare two offers side by side
- Personal Loan Calculator — Full payment and amortization
- How to Prequalify — Check rates without affecting your score
- Best Personal Loans — Compare top lenders
- All PrimeRates Calculators