Formulas and 2026 figures checked & updated: July 2026
APR Comparison Table
| APR | Monthly | Total Interest | Total Cost |
|---|---|---|---|
| 8.49% | $473.44 | $2,044 | $17,044 |
| 9.99% | $483.94 | $2,422 | $17,422 |
| 11.49% ◀ | $494.57 | $2,804 | $17,804 |
| 12.99% | $505.34 | $3,192 | $18,192 |
| 14.49% | $516.24 | $3,585 | $18,585 |
How to Use the Personal Loan Calculator
- Enter the loan amount you need (for example, $15,000).
- Enter the APR you've been offered by your lender (for example, 11.49%).
- Choose a repayment term using the term buttons — most personal loans run 12 to 84 months, with shorter terms carrying higher payments but far less total interest.
- Review your fixed monthly payment, total interest, and total cost in the summary panel.
- Use the APR comparison table to see how a lower or higher rate would change your payment — useful when you're comparing offers from multiple lenders.
- Adjust the rate or term to compare offers side by side. Example: a $15,000 loan at 11.49% APR over 36 months costs about $494.85/month with roughly $2,814.60 in total interest; the same loan at 7.99% APR — a rate available to borrowers with excellent credit — drops to about $469.92/month, saving nearly $897 in interest.
What This Calculator Does
The Personal Loan Calculator shows your fixed monthly payment, total interest paid, and overall loan cost for an unsecured personal loan — the kind used for debt consolidation, home improvements, medical bills, or major purchases. Because the payment and rate are fixed for the life of the loan, it's easy to budget around, unlike a credit card balance where the minimum payment and rate can shift over time.
The result is driven by three inputs: loan amount, APR, and term. Personal loan rates in 2026 span an unusually wide range — roughly 7% to 36% APR — because unlike a mortgage or auto loan there's no collateral backing the loan, so pricing leans heavily on your credit score and debt-to-income (DTI) ratio. Excellent-credit borrowers (750+) often land in the single digits, while fair or poor credit can push rates well above 20%. Lenders typically size loan offers relative to your income and existing debt, so keeping total monthly debt payments under roughly 36% of gross income improves both your approval odds and the rate you're offered.
Use this calculator whenever you're comparing a personal loan against alternatives like a balance-transfer credit card, a home equity loan, or simply paying down existing debt more slowly. Before committing to any offer, running the APR comparison table shows exactly how much a few percentage points of rate difference — or a longer versus shorter term — will cost you in total interest over the life of the loan. It's also useful once you already have a loan, to check whether refinancing at a lower rate would meaningfully cut your payment or total interest.
Formula
M = P × [r(1+r)ⁿ] / [(1+r)ⁿ − 1]This standard amortization formula spreads the loan principal and all accrued interest into equal monthly payments over the loan term. Each payment is split between interest on the remaining balance and principal reduction, with the interest share shrinking and the principal share growing every month until the balance reaches zero at the final payment.
- PLoan amount (principal) you're borrowing
- rMonthly interest rate (annual APR ÷ 12)
- nTotal number of monthly payments (term in months)
- MFixed monthly payment
Examples
Example 1: $15,000 debt consolidation loan at 11.49% for 36 months
P = $15,000, monthly rate = 11.49% ÷ 12 = 0.9575%, n = 36 payments.
Monthly payment ≈ $494.85 — total interest ≈ $2,814.60, total cost ≈ $17,814.60.
Example 2: Same loan, but with excellent credit (7.99% APR)
Same $15,000 over 36 months, but a 720+ credit score qualifies for a lower rate.
Monthly payment ≈ $469.92 — total interest drops to ≈ $1,917.12, saving roughly $897 versus the 11.49% rate.
Example 3: Stretching the term to lower the payment
$15,000 at 11.49% APR, but extended to a 60-month term instead of 36.
Monthly payment drops to ≈ $329.86, but total interest rises to ≈ $4,791.60 — about $1,977 more than the 36-month option.
Key Terms Explained
- APR (Annual Percentage Rate)
- The yearly cost of borrowing shown as a percentage, including the interest rate plus certain fees. APR lets you compare loans on an equal footing and is usually a bit higher than the plain interest rate.
- Interest Rate
- The percentage a lender charges on the principal, before fees. Unlike APR, the interest rate alone doesn't include origination or other loan costs.
- Principal
- The original amount borrowed or invested, before interest. Each loan payment is split between paying down principal and paying interest.
- Amortization
- Paying off a loan through fixed payments over time. Early payments are mostly interest; later payments are mostly principal as the balance shrinks.
- Loan Term
- The length of time you have to repay a loan. A longer term lowers the monthly payment but increases the total interest paid.
- Debt-to-Income (DTI)
- Your monthly debt payments divided by gross monthly income. Lenders typically want a back-end DTI of 36% or less, with 43% a common ceiling.
- Effective Tax Rate
- Your total tax divided by your total income — the average rate you actually pay across all brackets.
Methodology
Monthly payment: M = P·r(1+r)^n / [(1+r)^n − 1]. All calculations use monthly compounding on the outstanding balance, the standard method used by US personal loan lenders.
Frequently Asked Questions
What is APR on a personal loan?+
APR (Annual Percentage Rate) is the yearly cost of borrowing, including interest plus origination fees. It's a more complete picture than the interest rate alone. When comparing lenders, always compare APRs — not just interest rates.
What credit score do I need for a personal loan?+
Most lenders approve loans with scores 580+, but the best rates (under 10%) typically require 720+. Credit unions often offer better rates than banks. Online lenders like SoFi, LightStream, and Marcus may be competitive for borrowers with good credit.
Can I pay off a personal loan early?+
Most online lenders and credit unions allow early payoff with no penalty. Traditional banks and some fintech lenders may charge a prepayment penalty of 1–5% of the remaining balance. Always check your loan agreement before signing.
What is an origination fee on a personal loan?+
An origination fee is a one-time charge, typically 1–8% of the loan amount, that some lenders deduct from your loan proceeds or add to the balance to cover processing costs. It's factored into a loan's APR (unlike the interest rate alone), which is why comparing APRs rather than interest rates gives you a truer comparison between offers.
Is a personal loan or a balance-transfer credit card better for consolidating debt?+
A balance-transfer card often offers a 0% introductory APR for 12–21 months, which can be cheaper if you can pay off the balance before the promo period ends. A personal loan offers a fixed rate and a fixed payoff date for the entire term, which is usually the safer choice if you can't realistically clear the balance within a card's promotional window or need to consolidate more than a card's credit limit.
How long does it take to get approved for a personal loan?+
Many online lenders provide a decision within minutes to 24 hours, with funding arriving in your account in 1–5 business days. Traditional banks and credit unions can take several days to a week longer, especially if they require in-person verification. Getting pre-qualified (a soft credit check) with 2–3 lenders before formally applying lets you compare real rates without affecting your credit score.
Can I save my results?+
Yes. Use “Save results” to store a snapshot. Without an account it remains in this browser. If you log in, saved scenarios sync securely to your SmartRates account so they are available on your other devices.
How do I share my calculation?+
Click “Share” in the toolbar to copy a link (or open your device’s share sheet). The link encodes your exact inputs, so whoever opens it sees the calculator pre-filled with the same numbers and the same result.
Can I email my calculator results?+
Yes. Click “Email results” to open your default email application with the current inputs, results, and calculator link already included. Review the message and choose the recipient before sending.
Can I export or print my results as a PDF?+
Yes. Click “Export PDF” to open a clean, printable summary of your inputs and results that you can save as a PDF or print. It includes a timestamp and a link back to the calculator.
How accurate are the calculator results?+
The arithmetic follows the formula and assumptions documented on this page. The result is still an estimate because actual rates, fees, taxes, timing conventions, eligibility rules, and provider calculations can differ. Use figures from your official quote, statement, contract, or tax form before making a financial decision.
Which inputs have the biggest effect on the result?+
Rate, time, starting balance, recurring payments or contributions, and fees usually have the largest effects. Change one input at a time to create a conservative, expected, and optimistic scenario instead of relying on a single forecast.
Are taxes, fees, and inflation included?+
Only when they appear as an input or are explicitly described in the methodology. Do not assume an omitted cost is zero. Review the formula and methodology sections to see exactly what is included before comparing the result with an outside quote.
Can this calculator predict future rates or returns?+
No. A calculator projects the assumptions entered; it cannot predict market returns, inflation, variable interest rates, tax-law changes, or provider decisions. Rerun the calculation with several assumptions to understand the range of possible outcomes.
Why might my lender, bank, broker, or tax software show a different result?+
Professional systems may use daily timing, transaction dates, compounding conventions, rounding rules, account-specific fees, credits, eligibility details, or regulations that a general-purpose calculator cannot know. A small difference can be rounding; a large difference usually means an assumption or included cost is different.
Disclaimer: Calculations are for informational purposes only and do not constitute professional financial advice. Please consult with a certified professional before making financial decisions.