Quick start
- Open the Loan Calculator.
- Enter the amount borrowed as principal.
- Use the first example, "Personal loan: $12,000 at 9.5% for 4 years", if you want to see a filled-out estimate before entering your own values.
- Calculate, read the formula line, then copy the result only after the amounts, rates, and term look right.
Best uses
Use this guide when one of these tasks matches what you are trying to do.
- Estimate payments for personal loans, student loans, or other fixed-payment debt.
- Compare different loan terms before choosing a repayment plan.
- See the total interest cost behind a monthly payment.
- Use the result as a baseline for the amortization calculator.
What this calculator is for
The Loan Calculator is for fixed-payment debt where the balance is paid down over time. It shows the monthly payment and the interest cost behind that payment.
Use it when you want to: Estimate payments for personal loans, student loans, or other fixed-payment debt. Compare different loan terms before choosing a repayment plan.
What to enter
Finance estimates are sensitive to small input changes. Check whether a field expects a monthly amount, annual amount, dollar value, or percent before calculating.
- Enter the amount borrowed as principal.
- Enter the annual interest rate as a percent, such as 9.5 for 9.5%.
- Enter the repayment term in years, using decimals for partial years when needed.
Example walkthrough
Try the calculator example: Personal loan: $12,000 at 9.5% for 4 years. The example result is Monthly payment and total interest.
- For $12,000 at 9.5% for 4 years, the calculator converts the annual rate to a monthly rate.
- It spreads repayment over 48 monthly payments and calculates total interest from total paid minus principal.
Formula and steps
The calculator uses the standard amortized loan payment formula: payment equals principal times monthly rate times growth factor divided by growth factor minus one.
The formula line on the calculator page is there so the number is not a black box. Read it before using the answer in a budget, comparison, or planning note.
How to read the answer
Start with the headline result, then use the supporting metrics to understand what made the result larger or smaller.
- Monthly payment is the fixed estimate before extra fees or insurance.
- Total paid is payment times number of payments.
- Total interest shows the borrowing cost before fees or penalties.
Common mistakes to avoid
Most bad finance estimates come from mixing rates, terms, monthly amounts, and annual amounts. The other common mistake is using a planning estimate as if it were a final quote.
- Do not compare two loans by payment alone if the terms are different.
- Do not use APR-with-fees as if it were always the contract interest rate.
- Do not ignore prepayment penalties or fees that are not in the calculator.
What to try next
A related calculator can help check the same money question from another angle before you rely on one result.
- Use Payment Calculator for the same formula with a simpler layout.
- Use Amortization Calculator to test extra monthly payments.
Sources and estimate notes
This guide explains the calculator inputs, formula context, and estimate limits without treating the result as a final quote or professional recommendation.
Source links improve transparency, but they do not turn a quick calculator into professional advice or a final loan, tax, payroll, or investment answer.
Examples from the calculator
Monthly payment and total interest
Payment comparison estimate
Principal divided by months
Common questions
What can I use the Loan Calculator for?
Use it for quick planning, comparison, and what-if estimates before you check exact numbers with a lender, tax professional, payroll provider, or financial adviser.
How does the Loan Calculator calculate the result?
The calculator uses the standard amortized loan payment formula: payment equals principal times monthly rate times growth factor divided by growth factor minus one.
Is this financial, tax, or legal advice?
This calculator gives an educational estimate only. It does not include every fee, lender rule, tax rule, local rate, credit, penalty, or personal financial detail.
Related tools
- Payment Calculator Find a fixed monthly payment from amount, rate, and term.
- Amortization Calculator Estimate payoff time, total interest, and extra-payment savings.
- Interest Rate Calculator Estimate annual interest rate from principal, payment, and term.
History, privacy, and copying
Recent answers stay visible in the page while you work. The history is kept only in the current browser tab and is not sent to a server.
Copy answer copies the expression and result so you can paste it into notes, homework, a message, or another document.