What is a Loan Calculator
A loan calculator turns a fixed-rate offer into an estimated payment and payoff ledger. This version separates the requested amount, financed balance, usable proceeds, lender fees, interest, and optional extra principal so a low monthly payment is not mistaken for a low total borrowing cost.
This page is designed for ordinary amortizing loans with equal monthly payments, such as many personal, consumer, and installment loans. It is most useful before accepting an offer or when comparing terms. It is not a quote, approval decision, or substitute for the lender's disclosure documents.
How to Use Loan Calculator
Use figures from one written loan offer at a time. In the Loan stage, enter the requested amount, fixed annual interest rate used for payment math, and repayment term. In Fees, enter lender charges and select whether they are deducted, financed, or paid upfront. Currency changes display formatting only and does not convert values.
The Payoff plan stage is optional. Leave both extra amounts at zero to reproduce the scheduled loan, or enter recurring and one-time principal payments. After calculating, compare usable proceeds, scheduled payment, total borrowing cost, payoff time, interest saved, and the month-by-month balance.
- Enter the requested loan amount, fixed contract interest rate, and term from one offer.
- Enter lender fees and match how the offer says those fees are paid.
- Enter the fixed annual interest rate. If the disclosed APR includes fees, use the contract interest rate for the payment schedule and compare APR separately.
- Optionally add recurring or one-time extra principal and choose when each begins.
- Review net proceeds, scheduled payment, total borrowing cost, and the baseline-versus-selected interest comparison.
- Open the schedule to audit how each selected payment is divided between principal and interest.
Loan Payment Formula and Variables
The standard amortization formula produces one level principal-and-interest payment for every month. Early payments contain more interest because the outstanding balance is larger; the principal share generally rises as the balance falls.
The calculation treats the entered annual rate as a nominal fixed interest rate divided into 12 monthly periods. It does not derive a payment from a fee-inclusive APR, variable rate, daily simple interest method, or irregular payment calendar.
Monthly rate r = annual interest rate / 100 / 12Number of payments n = loan term in years x 12Monthly payment = P x r / (1 - (1 + r)^(-n))Total repayment = monthly payment x nTotal interest = total repayment - principal P
Worked Loan Example: $10,000 at 8.5% for 5 Years
For a $10,000 fixed-rate loan at 8.5% annual interest over 60 months, the estimated payment is $205.17 per month. Scheduled payments total about $12,309.92, so the estimated interest cost is $2,309.92 before lender fees or payment-timing differences.
The first payment contains about $70.83 of interest and $134.33 of principal. That split changes each month even though the payment stays level: interest declines with the balance, while more of each later payment reduces principal.
- Principal: $10,000.00
- Monthly payment: approximately $205.17
- Total scheduled interest: approximately $2,309.92
- Total scheduled repayment: approximately $12,309.92
How Loan Term Changes Payment and Total Interest
A longer term can make the monthly payment easier to fit into a budget, but it usually increases total interest because the balance remains outstanding for more months. The comparison below keeps the principal and 8.5% annual interest rate unchanged so the term is the only moving assumption.
These figures are mathematical scenarios, not market offers. A real lender may quote a different rate for each term, which can widen or narrow the difference.
| Loan term | Monthly payment | Total interest | Total repayment |
|---|---|---|---|
| 3 years | $315.68 | $1,364.31 | $11,364.31 |
| 5 years | $205.17 | $2,309.92 | $12,309.92 |
| 7 years | $158.36 | $3,302.65 | $13,302.65 |
Reading the Loan Cost Path
The result begins with four connected figures: cash received, scheduled payment, modeled payoff time, and total borrowing cost. Cash received may be lower than the requested amount when fees are deducted. The amount financed may be higher when fees are added to the balance.
A baseline-versus-selected interest comparison isolates the effect of extra principal. The complete monthly schedule follows the selected plan, can be reviewed year by year, and can be downloaded as a landscape PDF without creating an account.
- Requested amount, financed balance, and net proceeds shown separately.
- Deducted, financed, and upfront fee treatment.
- Recurring extra principal with a selected start month.
- One-time extra principal at a selected payment number.
- Baseline interest, selected-plan interest, savings, and months saved.
- Full selected payment schedule with yearly navigation and PDF export.
Before You Compare Loan Offers
Compare offers using the cash you actually receive, not only the amount printed at the top. A deducted fee reduces usable proceeds, a financed fee increases the balance that earns interest, and an upfront fee increases cash due at closing. Total borrowing cost brings those paths back to one comparable measure.
Extra-payment savings are conditional. Before relying on the accelerated schedule, confirm that the contract permits prepayment, that the servicer applies extra money to principal, and that no fee or penalty changes the economics.
Common Uses and When to Choose Another Tool
Use this calculator for a fixed-rate installment loan with equal monthly payments. It works well for a first comparison of personal loans, unsecured consumer loans, and other standard amortizing balances when the amount, fixed rate, and term are known.
Choose a more specific calculator when taxes, collateral, changing rates, or special repayment rules materially affect the agreement. The related car, business, mortgage, refinance, and debt-payoff tools model assumptions that this general page intentionally leaves out.
- Compare fixed-rate loan terms before requesting or accepting an offer.
- Estimate the payment for a planned purchase or debt consolidation amount.
- See the scheduled balance after a particular month or year.
- Use the car loan calculator for trade-ins, sales tax, fees, and down payments.
- Use a debt-payoff calculator when several debts compete for one payment budget.
Accuracy, APR, and Important Loan Limits
The payment math follows the standard fixed-rate amortization formula and keeps full internal precision before formatting money values. Small differences from a lender schedule can still occur because of payment dates, day-count rules, rounding, fees, or the way a final payment is adjusted.
Interest rate and APR are not always interchangeable. The interest rate is the borrowing rate used to calculate scheduled interest. APR may also reflect origination charges or other mandatory fees. When APR is higher than the contract interest rate, entering APR here can overstate the scheduled payment; compare the lender's APR separately as a broader cost measure.
- Assumes a fixed rate, equal monthly payments, and no skipped or late payments.
- Models entered lender fees but does not derive the legally disclosed APR from them.
- Does not model prepayment penalties, balloon payments, variable rates, daily simple interest, or optional products.
- Does not account for taxes, insurance, collateral costs, or currency conversion.
- Results are planning estimates and should be checked against the loan agreement and required disclosures.
Official References for Comparing Loans
The Consumer Financial Protection Bureau resources below explain installment-loan structure, the difference between interest rate and APR, and the meaning of amortization and other borrowing terms. Use the lender's current disclosures for the figures that govern an actual agreement.