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Loan / Mortgage Calculator

Before signing a mortgage or taking out a personal loan, you should know exactly what you're committing to. Our Loan and Mortgage Calculator takes three inputs — the loan amount (principal), annual interest rate, and loan term in years — and instantly computes your fixed monthly payment, total interest paid over the life of the loan, and total cost (principal plus interest). It also generates a detailed yearly amortization schedule showing how each year's payments are split between principal repayment and interest charges, along with the remaining balance. This gives you a clear picture of how your debt decreases over time and how much of your money goes toward interest versus actually paying down the loan.

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Loan Amount ($)

Annual Rate (%)

Term (Years)

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How to use

Enter the loan amount, interest rate, and term to calculate your monthly payment and see a yearly breakdown.

Uses the standard amortization formula.

check_circle Monthly payment calculation
check_circle Total interest and total cost
check_circle Yearly amortization schedule

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What is a Loan / Mortgage Calculator?

Amortization is the mechanism by which a fixed monthly payment simultaneously covers interest and chips away at the principal balance. The catch is the split is not even: in month one of a 30-year mortgage at 6%, almost 83% of each payment goes to interest and barely 17% reduces the loan. This ratio slowly inverts over time as the balance shrinks, but for most of the loan's life the bank collects more than the borrower repays in principal. This is why a $300,000 home at 6% over 30 years costs nearly $648,000 in total — more than double the original price.

Rate and term are the two levers that most dramatically change the outcome. Cutting a 30-year term to 20 years on that same loan saves over $130,000 in interest, while a one-percentage-point rate reduction across a 30-year term saves roughly $60,000. Running several scenarios side by side before committing is one of the highest-value financial exercises a borrower can do. For a deeper exploration of borrowing costs and financial planning tools, see https://usertools.app/guides/ultimate-guide-to-ai-tools-2026. The Percentage Calculator helps you work out what fraction of your income any monthly payment represents, and the Inflation Calculator shows how the real cost of that fixed payment erodes over time.

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When should you use it?

check_circle Homebuyers estimating monthly mortgage payments before making an offer on a property
check_circle Borrowers comparing different loan terms (15-year vs 30-year) to see the interest cost tradeoff
check_circle Car buyers calculating monthly payments for auto loans at different interest rates
check_circle Financial planners showing clients the total cost of borrowing over a loan's lifetime
check_circle Students estimating repayment amounts for education loans before borrowing
check_circle Small business owners evaluating the affordability of equipment or expansion loans

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How it works

The calculator uses the standard fixed-rate amortization formula used by banks and lenders worldwide: M = P × [r(1+r)^n] / [(1+r)^n – 1], where P is the loan principal, r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments (years multiplied by 12). This formula produces the fixed monthly payment amount that will fully repay the loan by the end of the term.

The amortization schedule is built by simulating every month of the loan. Each month, the interest charge is calculated as the remaining balance multiplied by the monthly rate. The principal portion of that month's payment is the total payment minus the interest charge. The remaining balance is then reduced by the principal portion. This process repeats for every month, and the results are aggregated into yearly summaries showing total principal paid, total interest paid, and end-of-year balance.

For zero-interest loans (0% APR), the formula simplifies to principal divided by the number of months, since there is no interest component. The calculator detects this special case and handles it correctly, avoiding the division-by-zero issue that the standard formula would produce with a zero rate.

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Frequently Asked Questions

What formula is used?

The tool uses the standard amortization formula: M = P × [r(1+r)^n] / [(1+r)^n – 1], where P is the principal (loan amount), r is the monthly interest rate (annual rate ÷ 12 ÷ 100), and n is the total number of monthly payments (years × 12). This is the same formula used by banks, mortgage lenders, and financial institutions worldwide to calculate fixed-rate loan payments. It ensures that each equal monthly payment covers both interest and principal in proportions that fully repay the loan by the end of the term.

Does this include taxes and insurance?

No. This calculator computes principal and interest (P&I) only, which is the core loan payment. Your actual monthly housing payment for a mortgage may also include property tax, homeowner's insurance, and private mortgage insurance (PMI) if your down payment is less than 20%. These additional costs vary significantly by location and property value. For a complete picture, add your estimated monthly tax and insurance to the calculator's result. This tool focuses on the loan mathematics to give you a clean, accurate baseline.

Can I calculate a 0% interest loan?

Yes. When you enter 0% as the interest rate, the calculator correctly handles this special case by simply dividing the principal by the total number of months. For example, a $12,000 loan over 2 years at 0% interest produces a monthly payment of exactly $500. The amortization schedule will show zero interest charges each year and a steadily declining balance. Zero-percent financing is common in promotional auto loans and some retail financing offers.

What does the amortization schedule show?

The amortization schedule provides a year-by-year breakdown of your loan repayment. For each year, it shows the total amount of principal paid, the total interest paid, and the remaining loan balance at year's end. In the early years of a long-term loan, you'll notice that most of your payment goes toward interest rather than principal. As the balance decreases over time, the interest portion shrinks and more of each payment goes toward paying down the principal. This visualization helps you understand the true cost structure of your loan.

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