Personal Finance

Loan Payment Calculator

Monthly payment, total interest, and full amortization for any fixed-rate loan. Adjust term and rate instantly.

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Loan Calculator

Monthly payment, total cost, extra payments & amortization

Loan Amount ($)

Annual Interest (%)

Loan Term

Term Unit

Extra Monthly Payment ($) optional

Loan Purpose optional

About Loan Calculations

How is the monthly payment calculated?

Monthly payment uses the standard amortization formula: M = P × [r(1+r)ⁿ] / [(1+r)ⁿ−1], where P is principal, r is monthly interest rate, and n is number of payments. Every payment covers interest first, then reduces principal.

What is a good interest rate for a personal loan?

As of 2026, personal loan rates typically range from 6%–36% depending on your credit score. Rates below 10% are generally considered competitive. Auto loans typically run 5%–9%, mortgages 6%–8%.

How can I reduce total interest paid?

The most effective strategies are: making extra principal payments, choosing a shorter loan term, and securing a lower interest rate. Even small extra monthly payments significantly reduce total interest over the life of a loan.

What is the difference between APR and interest rate?

The interest rate is the base cost of borrowing. APR (Annual Percentage Rate) includes the interest rate plus fees — origination charges, discount points — expressed as an annualized percentage. APR is always ≥ the interest rate and is the only fair way to compare loans from different lenders. Use the APR when comparing, not the headline rate.

How much does an extra $100/month save?

On a $25,000 loan at 6.5% over 60 months, an extra $100/month saves roughly $780 in interest and cuts 8 months off the loan. The impact grows significantly with higher balances and longer terms. Use the Extra Monthly Payment field above to model your exact scenario instantly.

Finance Guide

Loan Calculator Guide: Payments, Total Interest & APR Decoded

A practical loan calculator guide explaining how monthly payments are computed, what total interest you'll really pay, the difference between APR and interest rate, and what underwriters check before approving you.

Written by Calculixy Editorial TeamReviewed by a licensed consumer credit specialistUpdated: May 2026

From the Underwriting Desk

The monthly payment is the headline, but it's not the lesson. The lesson is what the payment hides: how much you're paying in interest over the life of the loan, how much of each early payment vanishes into interest before it touches principal, and how the rate quoted on a billboard differs from the APR you actually pay. A loan calculator answers all three — if you know what to look at after the payment number lands.

What this calculator does

The Loan Calculator estimates your fixed monthly payment for any amortizing loan — personal loan, auto loan, student loan, or unsecured debt — using the loan amount, interest rate, and term. It also reports total interest paid, total cost of the loan, and shows the amortization schedule so you can see how each payment splits between principal and interest over time.

The calculator works for any fixed-rate amortizing loan because they all use the same formula. Mortgages, auto loans, personal loans, student loans — same math, different inputs. Specialized calculators on Calculixy add purpose-specific features like sales tax for auto loans or PITI for mortgages, but the underlying payment math is identical.

When to use this calculator

Before signing for a personal loan or debt consolidation
To compare loan offers with different rates and terms side by side
To see whether a shorter term and higher payment saves enough interest to justify it
To estimate the impact of extra principal payments on payoff date
To check whether a "low monthly payment" really costs less or just stretches the loan
To compare a fixed loan against credit card payoff scenarios

The loan payment formula

Every fixed-rate amortizing loan — mortgage, auto, personal, student — uses the same formula:

M = P × [r(1 + r)ⁿ] / [(1 + r)ⁿ − 1]

Variable definitions

M = Monthly payment
P = Principal (the amount borrowed)
r = Monthly interest rate (annual rate ÷ 12, as a decimal)
n = Total number of payments (term in years × 12)

Total interest paid over the life of the loan is calculated separately:

Total Interest = (M × n) − P

Step-by-step example

Say you take a $20,000 personal loan at 11% APR over 5 years (60 months).

P = $20,000
r = 0.11 ÷ 12 = 0.009167
n = 5 × 12 = 60

Plugging into the formula:

M = 20,000 × [0.009167 × (1.009167)^60] / [(1.009167)^60 − 1] M ≈ $435 per month

Over the full 60 months, you'll pay back: $435 × 60 = $26,100. That means $6,100 in interest. The real cost of borrowing $20,000 at those terms is $6,100.

Now compare the same loan at 7 years (84 months). The payment drops to about $343 — a $92 monthly savings that feels meaningful. But total interest jumps to $8,815. You'd save $92 a month and pay an extra $2,715 in lifetime interest. The "lower payment" costs more.

The longer-term trap: Lenders advertise lower monthly payments by stretching the term. The headline number drops; the total cost goes up. Always compare total interest, not just monthly payment.

APR vs. interest rate: the distinction that matters

These two numbers look similar and get used interchangeably in marketing, but they're not the same.

Interest rate

The percentage charged on the principal balance. It's the rate used in the monthly payment formula.

APR (Annual Percentage Rate)

The interest rate plus origination fees, discount points, and certain mandatory closing costs, expressed as an annualized percentage. APR is required by federal law (the Truth in Lending Act) so consumers can compare loans on an even basis.

A loan with a 10% interest rate and $2,000 in fees might have an APR of 11.2%. A loan with a 10.5% interest rate and no fees might have an APR of 10.5%. The first loan is more expensive in total even though the headline rate looks lower.

Compare loans by APR, not interest rate. APR is the only number that captures fees, points, and the true annual cost of borrowing. The interest rate alone is marketing.

How amortization actually works

On a 5-year, $20,000 loan at 11%, the very first $435 payment splits roughly as follows: $183 to interest, $252 to principal. By month 30 (halfway through the loan), the split is roughly $250 to principal and $185 to interest. By the final months, almost the entire payment goes to principal.

This front-loading of interest is why early extra principal payments produce outsized savings. Adding even $50 a month to a $435 payment on a 5-year loan can shave 6-8 months off the term and save several hundred dollars in interest — because every extra dollar of principal you knock down early stops generating interest for the rest of the loan.

The principle: a dollar of extra principal payment in month 1 stops generating interest for 59 months. The same dollar paid in month 59 stops generating interest for one month. The savings concentrate in early payments. This is true for any amortizing loan, which is why financial advisors routinely recommend "snowballing" extra payments toward your earliest-stage debts.

What lenders actually check

Credit score

FICO scores from 300 to 850. Most personal lenders want 670+ for competitive rates; below 620 typically means subprime pricing or denial. Score directly impacts the rate offered — a 720 borrower might see 9.5% on the same loan a 620 borrower sees at 22%.

Debt-to-income (DTI)

Your monthly debt obligations divided by your gross monthly income. Most personal lenders want this below 40%, including the new loan payment. A higher DTI doesn't guarantee denial but does drive up the rate. See our Salary Calculator to convert your income for DTI math.

Income stability

Lenders look for at least two years of steady employment or income history. Gig income, recently changed jobs, and self-employment require additional documentation (bank statements, tax returns) and may receive less favorable terms. Self-employed borrowers typically need two years of tax returns showing consistent income.

Loan purpose

Some lenders price loans differently for debt consolidation, home improvement, or major purchases. Always state the purpose accurately — it's a federally regulated underwriting field, and misrepresentation can void the loan or worse.

Existing credit utilization

Even if your DTI is fine, lenders look at how much of your available credit you're already using. High utilization (over 30% on revolving accounts) signals stress and reduces approval odds even with strong income.

Real-world use cases

1. Should I consolidate credit card debt?

Credit cards typically charge 20%–28% APR. A personal loan at 11% can cut that nearly in half. Run both: the credit card minimum payment versus a 3- or 5-year fixed personal loan. If the personal loan saves several thousand in interest and gets you out of debt on a fixed timeline, it usually wins — provided you don't run the cards back up.

Example: $15,000 in credit card debt at 24% making minimum payments takes roughly 17 years and costs over $18,000 in interest. The same $15,000 as a 5-year personal loan at 11% costs about $4,576 in interest — a $13,500 savings, with a defined payoff date. The catch: if the cards get re-charged after consolidation, you've made the problem worse, not better.

2. Buying a used car

For an auto loan specifically, our Auto Loan Calculator includes sales tax, down payment, and trade-in values. The Loan Calculator works as a quick check for the financing portion. Used cars typically have higher rates than new cars (often by 1-2%) because they're considered higher-risk collateral.

3. Funding a major purchase

Compare the loan's total cost against the cost of waiting and saving. If you can save the purchase amount in 12-18 months, paying $1,500-$3,000 in interest to have it now is a real choice — sometimes worth it, sometimes not. The calculator gives you the number to weigh against the value of having it sooner. For purchases that aren't time-sensitive, saving usually wins on pure financial terms.

4. Student loan refinancing

Federal student loans often have flexible repayment options and forgiveness programs not available with private refinancing. Don't refinance federal loans into private without understanding what protections you're losing. For private student loans only, refinancing to a lower rate can save substantial interest — model it the same way you'd model any loan comparison.

Common mistakes

Focusing only on the monthly payment. A 7-year auto loan has a smaller payment than a 4-year. It also typically costs $3,000-$6,000 more in interest, and you may owe more than the car is worth for half the loan.
Comparing interest rates instead of APR. A 9.99% loan with $1,200 in fees is more expensive than a 10.5% loan with no fees on a 5-year term.
Ignoring prepayment penalties. Some loans charge a fee for paying off early. Read the loan agreement before assuming you can pay extra without cost.
Borrowing the maximum approved. Lenders approve you for a payment they think you can sustain. That's not the same as a payment that leaves room for emergencies, retirement contributions, and life.
Skipping the amortization schedule. The schedule shows where every dollar of every payment goes. Reviewing it once changes how you think about debt.
Taking out a loan to invest. Borrowing at 11% to invest at expected 8% returns is mathematically losing money. Even if it sometimes works, the expected value is negative.
Cosigning without understanding the obligation. Cosigning makes you fully responsible for the loan. Missed payments hit your credit; default makes you the borrower.

Frequently asked questions

What is a good interest rate on a personal loan?

It depends entirely on credit profile. Borrowers with excellent credit (760+) can find personal loan rates in the 7%-11% range. Average credit (670-720) typically sees 12%-18%. Below 620, rates climb to 25%-36%. Check current rates from multiple lenders — banks, credit unions, and reputable online lenders — to benchmark against your offers.

Can I pay off a loan early?

Usually yes, but check the loan agreement for prepayment penalties. Most personal loans from major banks and credit unions allow prepayment with no penalty. Some subprime lenders include them. Federal student loans and most mortgages have no prepayment penalty.

Why do I owe more than my original loan amount?

Total cost = principal + interest. The interest portion is the cost of borrowing. The longer the term and the higher the rate, the more interest accumulates. A 5-year loan at 11% on $20,000 means you pay back $26,100 — the extra $6,100 is interest.

What's the difference between fixed and variable rates?

Fixed-rate loans keep the same interest rate for the entire term — your payment never changes. Variable-rate loans adjust periodically based on a benchmark index (often SOFR or Prime). Variable rates often start lower but can rise significantly. Most personal loans and auto loans are fixed; HELOCs and some private student loans are variable.

Does the calculator account for taxes?

Interest on personal loans is not tax-deductible. Some mortgage and student loan interest may be deductible — those calculations require a tax professional's review and depend on whether you itemize.

How does loan term affect total cost?

Longer terms mean lower monthly payments but more total interest. On a $20,000 loan at 11%: a 3-year term costs $3,533 in interest; a 5-year term costs $6,100; a 7-year term costs $8,815. The shorter term costs less than half the longer term in total interest, even though the difference in monthly payment isn't huge.

Can a loan calculator predict my exact payment?

For fixed-rate, fully amortizing loans, yes — the formula is deterministic. The calculator's number will match what a lender quotes within a few dollars (rounding aside). Variable-rate loans, balloon loans, and loans with mandatory insurance or other fees built into payments may show different numbers on the loan documents.

What's the difference between secured and unsecured loans?

Secured loans use an asset (your car, house, or savings) as collateral; the lender can seize the asset if you default. Unsecured loans (most personal loans, credit cards) have no collateral, but the lender charges higher rates to compensate for that risk. Secured loans typically offer lower rates but put assets at risk.

Related Calculixy calculators

From the editorial desk: A loan calculator is a transparency tool. Lenders make money on the gap between what borrowers think they're paying and what they're actually paying. Running your own numbers — comparing total interest, comparing APRs, looking at the amortization schedule — closes that gap. The cheapest loan is rarely the one with the lowest advertised payment.

Calculixy's Loan Calculator provides estimates for educational use only and does not constitute a loan offer, financial advice, or a guarantee of approval. Actual rates, payments, and approval depend on your credit profile, the lender's underwriting, and current market conditions. Consult a qualified financial professional before borrowing. All calculations run locally in your browser; Calculixy does not collect or transmit the values you enter.