Loan Calculator — Monthly Payment, Total Interest & APR Reality Check 2026
The lender says your rate is 8%. Your APR is 11.3%. Your monthly payment is $347. But the total you repay is $20,820 on a $15,000 loan. None of these numbers are wrong — they’re just measuring different things. This loan calculator shows all of them at once: your monthly payment, total interest, finance charge, payoff date, and the APR after factoring in origination fees — so you can compare loan offers on equal terms before you sign anything.
A loan calculator estimates your monthly payment, total interest cost, and true APR based on your loan amount, interest rate, term, and any origination fees charged by the lender.
Loan Calculator
Estimate monthly payment, total interest, fees impact, and your payoff schedule
How to Use This Loan Calculator
Loan Amount
Enter the full loan amount you’re requesting — the principal before any fees are deducted. If a lender charges a 5% origination fee on a $15,000 loan, you’ll receive $14,250 in cash but still owe $15,000. Enter $15,000 as the loan amount — the calculator handles the fee impact separately.
Interest Rate
Enter the stated annual interest rate from your loan offer — not the APR. The interest rate is the annual cost of borrowing the principal alone. The APR — shown in the APR Reality Check output — is higher because it includes origination fees amortised over the loan term.
2026 average rates by loan type:
| Loan Type | Rate Range | Notes |
|---|---|---|
| Personal loan (excellent credit 750+) | 7–12% | Online lenders, banks |
| Personal loan (good credit 670–749) | 13–20% | Standard range |
| Personal loan (fair credit 580–669) | 21–36% | Higher risk tier |
| Auto loan (new, 750+ credit) | 5–7% | Dealership or bank |
| Auto loan (used, 670–749) | 7–11% | Higher rate on used |
| Student loan (federal undergrad) | 6.53% | 2024–25 fixed rate |
| Student PLUS loan (federal) | 9.08% | 2024–25 fixed rate |
| SBA 7(a) loan | 11–15% | Prime + margin |
| Business loan (bank) | 7–14% | Varies by term |
Loan Term
Select 24, 36, 48, or 60 months. Longer terms reduce your monthly payment but significantly increase total interest paid.
The term trade-off — $15,000 at 12% interest:
| Term | Monthly Payment | Total Interest | Total Repaid |
|---|---|---|---|
| 24 months | $706 | $1,944 | $16,944 |
| 36 months | $498 | $2,928 | $17,928 |
| 48 months | $395 | $3,960 | $18,960 |
| 60 months | $333 | $4,980 | $19,980 |
A 60-month term saves $373/month vs a 24-month term — but costs $3,036 more in total interest. The longer term is not “cheaper.” It’s more affordable monthly but more expensive overall.
Origination Fee
Enter the origination fee your lender charges — either as a percentage or dollar amount. This field is what makes this calculator meaningfully different from most others.
What an origination fee actually does:
Origination fees are charged upfront by lenders to cover processing costs. They typically range from 1–8% for personal loans and 0.5–1% for mortgages. The fee is usually deducted from your disbursement — you receive less cash than you borrowed, but you repay the full amount.
Example — $15,000 loan with 5% origination fee:
Loan amount (what you owe): $15,000
Origination fee (5%): −$750
Cash you actually receive: $14,250
But your payments are based on: $15,000
Monthly payment (12%, 36mo): $498
Total repaid: $17,928
You borrowed $14,250 in real terms but repay $17,928. That’s an effective APR of approximately 14.3% — not the 12% stated rate.
Extra Payment (Optional)
Enter any additional monthly amount you plan to pay above the required payment. Extra payments apply directly to principal, reducing future interest and shortening your payoff date.
The power of extra payments — $15,000 loan at 12%, 36 months:
| Extra Monthly Payment | Months Saved | Interest Saved | New Payoff Date |
|---|---|---|---|
| $0 (standard) | — | — | 36 months |
| $50/month | 3 months | $297 | 33 months |
| $100/month | 5 months | $540 | 31 months |
| $200/month | 8 months | $876 | 28 months |
Even $50/month extra on a typical personal loan cuts 3 months and saves nearly $300 in interest. On larger loans — auto or mortgage — the savings compound dramatically.
Understanding Your Results
Estimated Monthly Payment
Your required payment each month — principal and interest only. This is the number you budget against. It does not change with market rates (fixed-rate loans) and does not include insurance, property tax, or other costs that may be part of your overall housing payment.
What Users Usually Compare
The calculator surfaces the three numbers most borrowers compare when evaluating a loan:
Monthly Payment: How much leaves your account each month. Most borrowers focus here — but this is the least complete measure of loan cost.
Total Interest: The full amount you pay in interest over the loan’s life. This is the real cost of borrowing. Two loans with identical monthly payments can have dramatically different total interest if the terms differ.
Upfront Fee (Finance Charge): The origination fee in dollar terms — the cash cost of getting the loan. This is separate from interest and is often overlooked when comparing offers.
Total of Payments
The sum of all monthly payments — principal plus all interest. This is how much leaves your pocket over the full loan term.
Finance Charge
The total cost of borrowing beyond principal — interest plus origination fee. This is the number lenders are legally required to disclose under the Truth in Lending Act (TILA).
Payoff Date
The calendar month and year when your last payment is due, based on your start date and term. Useful for planning — if you’re taking a 36-month loan to pay off before a specific life event, the payoff date confirms your timeline.
APR Reality Check — The Most Important Number
This is the feature that most loan calculators omit entirely.
APR (Annual Percentage Rate) is the true annual cost of the loan after factoring in origination fees — not just the interest rate. Under the Truth in Lending Act, lenders must disclose APR, but many borrowers still compare loans by stated interest rate rather than APR.
Why APR matters — a real comparison:
| Loan A | Loan B | |
|---|---|---|
| Loan amount | $15,000 | $15,000 |
| Stated rate | 10% | 12% |
| Origination fee | 5% ($750) | 0% |
| APR (36-month term) | ~13.2% | 12.0% |
| Total interest | $2,525 | $2,928 |
| Total repaid | $18,275 | $17,928 |
Loan A has a lower stated rate (10% vs 12%) but higher APR (13.2% vs 12%) and costs $347 more overall because the 5% origination fee overwhelms the rate advantage on a 3-year loan.
The rule: Always compare APR — not stated interest rate — when evaluating loan offers from different lenders.
Origination fee impact on APR by term: A 5% origination fee adds approximately:
- 9–10% to APR on a 12-month loan
- 3–4% to APR on a 36-month loan
- 2–3% to APR on a 60-month loan
- 0.5–0.8% to APR on a 30-year mortgage
On short-term loans, upfront fees hit much harder. On long-term mortgages, the same percentage fee barely moves the APR because it’s spread over hundreds of payments.
Amortization Schedule
The full month-by-month breakdown showing how each payment splits between interest and principal, and the remaining balance after each payment. The schedule confirms your payoff date and shows when you cross from paying mostly interest to paying mostly principal.
Early payments on amortising loans are heavily weighted toward interest. On a $15,000 loan at 12% over 36 months, your first payment of $498 breaks down as $150 interest and $348 principal. By month 30, the same payment is $20 interest and $478 principal.
Loan Types — Which Calculator Do You Need?
This calculator handles any fixed-rate instalment loan. For specialised loan types, dedicated calculators provide more precise outputs:
Personal Loan
Unsecured loans typically used for debt consolidation, home improvement, medical expenses, or large purchases. Terms: 2–7 years. Rates: 7–36% depending on credit. Origination fees: 1–8% — always enter this in the calculator for accurate APR comparison.
About half of all personal loans are used for debt consolidation — replacing high-interest credit card debt (typically 20–29% APR) with a lower-rate instalment loan. Use this calculator to confirm the rate break-even before consolidating. Use our Car Refinance Calculator for refinancing existing auto debt.
Auto Loan
Secured loans backed by the vehicle. New car rates run 5–7% for excellent credit; used car rates run 7–11%. Terms: 36–84 months. The 84-month (7-year) auto loan has become common but dramatically increases total interest — model both a 48 and 84-month term in the calculator to see the actual dollar difference before accepting a dealer’s “low monthly payment” offer.
Student Loan
Federal student loans have fixed rates set annually by Congress. For 2024–25: undergraduate Direct Loans 6.53%, PLUS loans 9.08%. Federal loans carry origination fees (Direct: 1.057%, PLUS: 4.228%) — enter these in the origination fee field. For income-based repayment planning, a dedicated student loan calculator with IBR/PAYE/SAVE plan options is more appropriate.
Business and SBA Loans
SBA 7(a) loans typically run at Prime + 2.75% to Prime + 4.75% (approximately 11–15% at current prime rates). Origination fees and SBA guarantee fees add significantly to effective APR — always model with fees included. Use our Investment Calculator to compare loan-financed business expansion against alternative capital uses.
Home Equity and HELOC
Home equity loans are fixed-rate instalment loans secured by your property — this calculator handles them directly. HELOCs are revolving credit lines with variable rates — they behave differently from instalment loans. For both, see our HELOC Calculator for credit line sizing and our mortgage-specific tools for property-secured debt.
Debt Consolidation
Personal loans used to consolidate higher-rate debt are one of the most valuable use cases for a loan calculator. Compare your weighted average credit card APR against the personal loan APR (including origination fee) to confirm you’re actually saving money. The calculator’s total interest figure tells you exactly how much the consolidation loan costs — compare that to continuing to pay minimums on your existing debt.
Interest Rate vs APR — The Difference That Costs Borrowers Real Money
What the Stated Interest Rate Shows
The interest rate is the annual percentage charged on the outstanding principal. On a $15,000 loan at 12%, you pay 12% of $15,000 = $1,800 in interest in year one (slightly less as principal decreases monthly). It measures only the time cost of borrowing — not fees.
What APR Shows
APR includes the interest rate plus all required lender fees — origination, processing, and any other mandatory upfront charges — expressed as a single annual rate. Under the Truth in Lending Act, lenders must disclose APR before you commit to a loan.
The formula:
APR = Rate at which present value of all payments
equals net loan proceeds (loan minus fees)
This is calculated iteratively — the same Newton-Raphson method used by the Federal Reserve. The calculator does this automatically and displays the result in the APR Reality Check panel.
When interest rate = APR: Only when there are no origination fees. A no-fee loan at 12% has an APR of exactly 12%.
When APR diverges from interest rate: Every time an origination fee exists. The higher the fee and the shorter the term, the larger the gap.
Extra Payments — How Much Time and Money You Actually Save
The Mechanics of Extra Payments
Extra payments on fixed-rate loans go entirely to principal reduction — they do not lower your required monthly payment. They shorten your loan term and reduce total interest because future interest is calculated on a lower outstanding balance.
Three scenarios — $20,000 loan at 7%, 60 months:
Standard payments only:
Monthly payment: $396
Total interest: $3,761
Payoff: Month 60
+$50/month extra:
Monthly payment: $446 (effective)
Total interest: $3,282
Months saved: 5 months
Interest saved: $479
+$100/month extra:
Monthly payment: $496 (effective)
Total interest: $2,856
Months saved: 9 months
Interest saved: $905
On larger loans — mortgages, large auto loans — the same principle produces much larger savings because the balance is higher and the term is longer.
Lump Sum vs Monthly Extra Payments
A one-time lump sum payment applied to principal produces the same mathematical effect as sustained monthly overpayments — it reduces the outstanding balance and all future interest calculations. A $2,000 lump sum on a $20,000, 7%, 60-month loan saves approximately $700 in interest and shortens the term by 7 months.
Prepayment Penalties
Most personal and auto loans have no prepayment penalty. Always confirm before making extra payments. Federal student loans have no prepayment penalties. Some private student loans and older mortgages may include them — check your loan documents.
How to Calculate Loan Interest — The Formula
Monthly Payment Formula
M = P × [r(1+r)^n] / [(1+r)^n − 1]
Where:
M = Monthly payment
P = Principal (loan amount)
r = Monthly interest rate (annual rate ÷ 12)
n = Total number of payments (term in months)
Example — $15,000 at 12%, 36 months:
r = 12% ÷ 12 = 1% = 0.01
n = 36
M = 15,000 × [0.01 × (1.01)^36] / [(1.01)^36 − 1]
M = 15,000 × [0.01 × 1.4308] / [1.4308 − 1]
M = 15,000 × 0.014308 / 0.4308
M = 15,000 × 0.03321
M = $498.17/month
Total Interest Formula
Total Interest = (Monthly Payment × Number of Payments) − Principal
= ($498.17 × 36) − $15,000
= $17,934 − $15,000
= $2,934
Simple Interest (for comparison)
Some short-term loans use simple interest instead of amortisation:
Simple Interest = Principal × Rate × Time
= $15,000 × 0.12 × 3 years = $5,400
Simple interest is higher than amortised interest because it calculates on the full principal for the full term — it ignores that you’re paying down principal each month. Amortised loans calculate interest only on the outstanding balance, which decreases monthly.
What Is a Good Interest Rate? By Loan Type
Interest rates vary by loan type, term, credit score, and lender. These 2026 benchmarks help you evaluate whether an offer is competitive:
Personal Loans
Excellent (750+): 7–12% — competitive
Good (700–749): 13–17% — standard
Fair (670–699): 18–24% — higher but normal
Poor (580–669): 25–36% — maximum legal in most states
A personal loan rate above 20% warrants careful consideration — it may still beat credit card APRs (typically 24–29%), but total interest over a 5-year term can exceed the original debt.
Auto Loans (2026)
New car, excellent credit: 5.0–6.5%
New car, good credit: 6.5–9.0%
Used car, excellent credit: 7.0–9.0%
Used car, good credit: 9.0–13.0%
Dealer financing often quotes monthly payment rather than rate — always ask for the APR before accepting. Dealers earn income on financing spreads and may mark up rates above what you’d qualify for directly at a bank or credit union.
Student Loans
Federal Direct (undergrad): 6.53% ← fixed by law
Federal PLUS: 9.08% ← fixed by law
Private (excellent credit): 4–8% ← can beat federal for strong borrowers
Private (average credit): 10–14%
Federal loans offer income-based repayment, deferment, and forgiveness programs that private loans do not. A lower private rate is not always better when you factor in these protections.
Frequently Asked Questions
What is the difference between interest rate and APR on a loan?
The interest rate is the annual cost of borrowing the principal — it ignores fees. APR (Annual Percentage Rate) includes the interest rate plus all required lender fees, expressed as a single annual percentage. Under the Truth in Lending Act, lenders must disclose APR. A loan with a 10% interest rate and 5% origination fee has an APR of approximately 13–14% on a 3-year term — 3–4 points higher than the stated rate. Always compare APR across loan offers.
How does an origination fee affect my loan?
An origination fee (typically 1–8% of the loan amount) is deducted from your disbursement or added to your loan balance. Either way, you pay interest on the full loan amount but receive less cash. A $15,000 loan with a 5% origination fee disburses $14,250 but generates $15,000 in repayment obligations. The APR Reality Check in the calculator shows exactly how much the origination fee adds to your true borrowing cost.
How much does an extra $100/month save on a loan?
It depends on the loan size, rate, and remaining term. On a $15,000 personal loan at 12% with 36 months remaining, an extra $100/month saves approximately $540 in interest and pays off the loan 5 months early. On a $25,000 auto loan at 8%, the same $100/month extra saves approximately $900 and shortens the term by 8 months. Use the Extra Payment field to model your specific loan.
Should I choose a shorter or longer loan term?
Shorter terms save significantly in total interest but require higher monthly payments. Longer terms are more affordable monthly but cost much more over time. The right choice depends on your cash flow: if the higher payment of a shorter term strains your budget, a longer term with extra payments provides flexibility — pay the minimum when needed, overpay when possible.
What is a finance charge on a loan?
Finance charge is the total cost of borrowing beyond the principal — interest paid over the life of the loan plus any origination fees. It is the number the Truth in Lending Act requires lenders to disclose. On a $15,000 loan at 12% over 36 months with a $750 origination fee, the finance charge is approximately $3,678 ($2,928 interest + $750 fee).
How is monthly loan payment calculated?
Monthly payment = Principal × [r(1+r)^n] / [(1+r)^n − 1], where r is the monthly interest rate (annual rate divided by 12) and n is the number of months. On a $15,000 loan at 12% for 36 months: monthly rate = 1%, n = 36, payment = $498/month. The calculator performs this calculation instantly for any inputs.
Can I pay off a loan early without penalty?
Most personal and auto loans have no prepayment penalties — you can pay early without extra charges. Always confirm in your loan agreement. Federal student loans have no prepayment penalties. Some private student loans and older mortgage products may include them. If your loan has a prepayment penalty, factor it into the early payoff savings calculation.
What is the APR Reality Check?
The APR Reality Check shows the true annual cost of your loan after factoring in the origination fee — not just the stated interest rate. Most loan calculators only show the monthly payment based on the stated rate. The APR Reality Check shows you the effective rate that accounts for what you actually receive vs what you repay — the number you should use when comparing loan offers from different lenders.
Data Source :
This loan calculator uses the standard amortisation formula as mandated by the US Truth in Lending Act (Regulation Z, 12 CFR Part 1026), which requires lenders to disclose the Annual Percentage Rate (APR) on all consumer loans. The APR calculation includes the stated interest rate plus any origination fees and mandatory charges amortised over the loan term — producing the true annual cost of borrowing. Credit score rate tiers are based on 2026 average APR data published by the Federal Reserve Consumer Credit G.19 statistical release and Credible’s weekly personal loan rate tracker (12-month average, updated April 2026). Results are estimates for planning purposes. Actual APR depends on lender, credit profile, income, and debt-to-income ratio.
Related Tools — Calc Docu Finance Suite
Understanding your loan is step one. These related tools handle the broader financial picture:
For a complete month-by-month breakdown of how every payment splits between principal and interest, see the Mortgage Amortization Calculator — the same amortization logic applies to any fixed-rate loan, and the schedule reveals exactly when your balance crosses key thresholds.
If you’re consolidating debt or refinancing an existing auto loan, the Car Refinance Calculator calculates your break-even point on refinancing costs versus monthly savings. For paycheck-based affordability — determining whether a loan payment fits your take-home pay — the Paycheck Calculator shows your after-tax monthly income as the baseline.
Borrowers using home equity for loan consolidation or home improvement can size their available credit line with the HELOC Calculator. And for homeowners comparing a home equity loan against a cash-out refinance, the Mortgage Calculator models the full PITI payment on any mortgage amount.