Loan Calculator
Estimate monthly loan payments and total interest.
Estimates only — always confirm the figures with your lender or a licensed professional before you commit.
This tool gives approximate results for planning only. It is not financial advice. Verify every number against your official loan, tax, or payroll documents.
How to use Loan Calculator
Estimate monthly loan payments, total interest and payoff schedule for any loan.
Open Loan Calculator on toolpermarket and enter your values in the fields below.
In the Loan amount field, enter the principal borrowed. This is amount minus down payment.
In the Interest rate field, enter the annual rate as a percent. A small rate change moves the payment more than expected.
In the Term field, enter the length in months or years. Longer terms lower the payment but raise total interest.
Press Calculate to compute the result. The output appears immediately below the form. You can change any input and run it again to compare results.
Read the result and use it as needed. If the number looks off, re-check your inputs and run it again — the math is deterministic, so the same entries always return the same answer.
Worked example. A $10,000 loan at 7 percent over 5 years costs about $198 a month and roughly $1,880 in total interest.
Tips for accurate results.
Compare a shorter term to see interest saved.
Add any fee into the amount to model the real cost.
Watch that the rate is annual, not per-month.
When to use Loan Calculator. Affordability checks before borrowing. Comparing two loan offers side by side. Seeing total interest, not just the monthly bite.
When you actually reach for this
- You want the fixed monthly payment on a lump sum borrowed at a fixed rate.
- You are comparing two loan offers by their monthly outflow.
Where this tool stops being accurate
- It assumes a fixed rate and equal monthly payments; it excludes origination fees, insurance and taxes that raise the real cost.
- It does not model variable-rate loans where the payment resets with the index.
Frequently asked questions
Why does a longer term cost more overall?
Because you pay interest for more time, even though each monthly payment is smaller. The total interest is the rate applied across all those extra months, so stretching a loan lowers the payment but raises what you hand back in the end. For anything binding, check with a qualified professional about your specific situation.
Is the rate entered as monthly or yearly?
Yearly, as an annual percentage. The calculator divides it internally to a per-period figure, so enter 7 for seven percent, not the monthly fraction. Mixing the two is the usual reason a result looks far too small or too large. For anything binding, check with a qualified professional about your specific situation.
Does this include fees?
No, it models principal and interest only. Origination fees, insurance, or penalties sit on top, so treat the output as the core loan and budget any extra charges separately when judging the true cost. For anything binding, check with a qualified professional about your specific situation.
Why is my actual payment higher than the result?
Lenders often add escrow for taxes and insurance plus an origination fee on top of principal and interest, so budget a little above the calculated number. For anything binding, check with a qualified professional about your specific situation.
Does paying extra change the total interest?
Yes. Any extra principal shortens the term and cuts total interest; this tool shows the scheduled payment, not the savings from overpaying. For anything binding, check with a qualified professional about your specific situation.