Free Loan Calculator
Estimate monthly payments, total interest, and full amortization — no signup needed.
Payment Breakdown
Balance Over Time
Year-by-Year Amortization Schedule
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What is a loan calculator?
A loan calculator is a free online tool that helps you calculate your monthly loan payment, total interest, and payoff schedule for any fixed-rate loan. It runs entirely in your browser — no signup, no app, and no data is ever sent to a server.
Loans are one of those things where the monthly payment seems manageable until you look at what you're actually paying in interest over the full term. This calculator shows both: the monthly payment and the full year-by-year amortization schedule, plus how much extra payments would save you and how much sooner you'd be done. Enter the amount, rate, and term, and it lays everything out. When I help friends compare loan offers, the number that always shocks them is the total interest — not the monthly payment — and this calculator puts it front and center where you can't miss it.
A lot of loan calculators give you a monthly payment number and that's it. This one generates a complete amortization breakdown, shows the impact of extra principal payments, compares biweekly vs. monthly schedules, and includes a debt-to-income ratio so you can see how the loan fits into your broader financial picture.
How the loan calculator works
The loan payment calculator uses the standard amortization formula to determine your fixed monthly payment. For each month of the loan term, it calculates the interest portion (current balance × monthly rate), applies your payment to cover that interest first, and uses the remainder to reduce the principal. With extra payments enabled, the calculator adds your extra amount to the principal payment each month, accelerating the balance reduction and reducing total interest. The results include a year-by-year amortization schedule and a visual chart comparing the standard payoff vs. accelerated payoff timeline.
For example, on a $300,000 loan at 6.5% APR for 30 years with no extra payment, the calculator shows a $1,896 monthly payment, $382,560 total interest, and a $682,560 total cost. Adding $200 per month in extra payments reduces the total interest to $301,121 and pays off the loan in 24 years instead of 30 — saving over $81,000. The chart visualizes both scenarios as parallel lines, making it easy to see how the accelerated balance curve pulls away from the standard curve over time.
Because the calculator runs entirely in your browser, you can experiment freely with different interest rates, loan amounts, and extra payment amounts without any limits. Your inputs are automatically saved locally, so you can revisit your calculations later. The print button generates a clean amortization schedule you can save as a PDF or print for your records when applying for a loan or planning your repayment strategy.
When to use a loan calculator
Use a loan calculator whenever you are shopping for a mortgage, car loan, personal loan, or student loan. It helps you compare different loan offers by showing the real cost beyond the monthly payment. Before signing any loan agreement, run the numbers to see how the interest rate and term length affect your total cost. The calculator is also useful for debt consolidation planning — see how a lower-rate consolidation loan compares to your current payments.
For homeowners, the extra payment feature helps plan accelerated mortgage payoff strategies. For car buyers, compare 48-month vs 60-month or 72-month terms to see the interest savings of a shorter loan. For students, estimate how different repayment plans affect the total cost of your education loans.
The loan calculator's flexibility makes it valuable for many other scenarios as well. Small business owners can model equipment financing costs. Home buyers can compare 15-year vs 30-year mortgages to decide which term aligns with their retirement goals. Anyone considering a personal loan for home improvements or debt consolidation can see the true cost of borrowing before committing. The side-by-side comparison of standard versus extra-payment amortization schedules is particularly eye-opening — it transforms the abstract idea of "paying extra" into concrete numbers showing months saved and interest dollars not paid.
Common mistakes
The most common mistake I see borrowers make is only looking at the monthly payment and ignoring the total interest cost. A 72-month car loan at 7% might have a "manageable" $340 monthly payment on $20,000, but you'd pay over $4,500 in total interest. The same loan over 48 months jumps to $479 per month but saves you $1,200 in interest. Dealerships and lenders push longer terms because they make more money on interest — they're not doing you a favor.
Another frequent error: misunderstanding how extra payments work. A lot of people think paying $100 extra per month means you're paying $100 more toward the loan, period. But because that $100 goes directly to principal (not interest), the actual savings compound over time. On that $300,000 loan at 6.5%, a $200 extra payment saves over $81,000 — not $200 × 360 months = $72,000, but more, because every dollar of principal you pay early avoids future interest on that dollar forever. I've had to explain this to multiple friends who were skeptical that "just $200" could make such a difference.
Understanding amortization
Amortization is the process of spreading a loan into a series of fixed payments over time. In the early years of a long-term loan like a 30-year mortgage, roughly 70–80% of each payment goes toward interest, with only 20–30% reducing the principal. Over time, these proportions flip: by year 20, most of the payment applies to principal. This is why making extra payments early in the loan term has an outsized impact — every dollar of extra principal avoids decades of future interest. The amortization schedule in this calculator shows the exact split for each year of the loan.
The concept of "interest front-loading" is important for borrowers to understand. Banks structure amortized loans so that interest is collected first because the outstanding balance is highest at the beginning. This is not a penalty — it is simply how the math works when you borrow a large sum and pay it back gradually. However, it does mean that if you sell your home or refinance within the first five to seven years of a 30-year mortgage, most of your payments have gone to interest rather than building equity. Running the numbers through this loan calculator before buying or refinancing gives you a clear picture of how your payments are allocated at every stage, helping you make informed decisions about loan terms and prepayment strategies.
How to use this calculator
- Enter your loan details — Type the total loan amount, annual interest rate, and loan term in years. Use realistic values — for a mortgage try $300,000 at 6.5% for 30 years.
- Add an extra payment (optional) — Enter any extra amount you plan to pay each month beyond the required payment. Even $50–$100 per month makes a significant difference in total interest and payoff time.
- Review your full amortization schedule — Click Calculate to see your monthly payment, total interest, and total cost. Toggle between Standard and With Extra tabs to compare amortization year by year and view the balance-over-time chart.
Frequently asked questions
What is the monthly payment on a $10,000 loan at 7% interest?
A $10,000 loan at 7% annual interest over 3 years has a monthly payment of approximately $308.77, with total interest paid of $1,115.72. Over 5 years, the payment drops to $198.01 but total interest rises to $1,880.60. Enter any loan amount, rate, and term into the calculator above to see your exact monthly payment and full amortization schedule.
How do I calculate my monthly loan payment manually?
Monthly payment = P × [r(1+r)^n] ÷ [(1+r)^n - 1], where P = loan amount, r = monthly interest rate (annual rate ÷ 12), n = total number of payments. For $5,000 at 6% over 2 years: r = 0.06/12 = 0.005, n = 24. Payment = 5000 × [0.005 × (1.005)^24] ÷ [(1.005)^24 - 1] = $221.60/month.
How much total interest will I pay on a loan?
Total interest = (Monthly Payment × Number of Payments) - Principal. For a $15,000 car loan at 5.5% over 48 months: monthly payment ≈ $349.90, total paid = $349.90 × 48 = $16,795.20, total interest = $16,795.20 - $15,000 = $1,795.20. The calculator shows total interest prominently — it's often more than borrowers expect for longer-term loans.
How does making extra loan payments reduce interest?
Extra payments reduce your principal balance immediately, which reduces the interest calculated each subsequent month. On a $20,000 loan at 6% over 5 years, paying an extra $100/month cuts the payoff time by about 11 months and saves approximately $560 in interest. Early in the loan term, when the balance is highest, extra payments have the most impact.
What is an amortization schedule and how do I read it?
An amortization schedule shows every payment broken into principal and interest portions. Early payments are mostly interest — on a 5-year loan at 6%, roughly 25% of your first payment goes to principal and 75% to interest. By the final year, over 90% goes to principal. The schedule also shows your remaining balance after each payment.
What loan term gives the lowest total cost?
Shorter loan terms always cost less in total interest. A $20,000 loan at 7%: over 3 years total interest = $2,214; over 5 years = $3,761; over 7 years = $5,348. The monthly payment is higher for shorter terms but the total cost is significantly lower. Only choose a longer term if you genuinely need the lower monthly payment for cash flow reasons.