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Free finance calculator
Estimate monthly loan payments, total interest, total cost, payoff date, and how extra payments can shorten a loan.
Payment result
Estimate only. This is not financial advice or a loan offer.
Enter the amount you plan to borrow, the annual interest rate, and the loan term in years. The calculator estimates the regular monthly payment for a fixed-rate loan. Add an extra monthly payment to see how paying more than the minimum may reduce the payoff time and total interest.
A fixed loan payment is based on the loan amount, monthly interest rate, and number of monthly payments. Higher rates and shorter terms usually increase the monthly payment.
The payment formula spreads principal and interest across the full term. Early payments usually contain more interest, while later payments apply more toward principal as the balance drops.
To reproduce this example, enter a $25,000 loan amount, a 7.5% annual interest rate, a 5-year term, and $0 as the extra monthly payment. The calculator returns a regular payment of about $500.95, total interest of about $5,056.92, and a total cost of about $30,056.92 over 60 monthly payments.
Now change only the extra monthly payment to $100. The planned monthly outflow becomes about $600.95. Under the calculator's assumptions, the loan is paid off in 49 months, total interest falls to about $4,043.31, and the payoff arrives 11 months earlier. That is approximately $1,013.61 less interest than the no-extra plan.
Decision point: the extra-payment plan is useful only if the additional $100 fits comfortably in the monthly budget and the lender applies it to principal without a penalty. Keep enough cash available for required expenses before treating an accelerated payoff as the better option.
A longer term can make a payment easier to carry without making the loan less expensive. Using the same $25,000 balance and 7.5% rate, the calculator produces the following comparison. Fees are excluded so the term is the only changing input.
The 7-year option frees about $117.49 per month compared with the 5-year option, but adds about $2,153.46 in interest if every payment follows the schedule. The 3-year option costs about $276.71 more per month than the 5-year option, but saves about $2,061.33 in interest. Compare the cash-flow relief with the full cost instead of choosing from the payment alone.
First, enter the same amount and term for each offer so the payment comparison is meaningful. Then record the interest rate, APR, origination fee, required add-ons, and total amount financed from each lender's disclosure. The calculator accepts an interest-rate assumption; it does not convert lender fees into an APR or subtract fees withheld from the loan proceeds.
The Consumer Financial Protection Bureau explains that an APR incorporates the interest rate and certain loan fees, which makes it a broader price measure than the interest rate alone. Its interest rate and APR explanation and loan-offer comparison checklist are useful references when reviewing lender disclosures.
Practical comparison: use this calculator to test the payment and interest effect of the stated rate, then use the lender's APR and dollar-fee disclosures to compare the real offers. If one offer has a lower rate but a higher APR, inspect the fees rather than assuming it is automatically cheaper.
This calculator models a fixed-rate, fully amortizing loan. It divides the annual rate by 12, accrues interest monthly on the remaining balance, and applies one payment each month. The selected term is converted to the nearest whole number of months. Any extra amount is treated as an additional principal payment every month, and the final payment may be smaller than the displayed planned payment.
The estimate does not include origination fees, late fees, taxes, insurance, escrow, daily-interest timing, payment holidays, variable-rate changes, or prepayment restrictions. It also assumes every payment arrives on schedule. Those differences can change both the payoff date and total cost, so the lender's contract and disclosures control the real loan.
If a lender offers a lower payment, check whether the term is longer, fees are higher, or optional products have been added. A payment can look easier while the total loan cost becomes more expensive.
For mortgages, auto loans, student loans, and personal loans, read the actual disclosure documents and ask how interest accrues, how extra payments are applied, and whether there are penalties or administrative fees. The calculator helps compare assumptions, but the contract controls the real payment rules.
Common mistakes include comparing only the monthly payment, ignoring total interest, forgetting origination fees, or assuming every extra payment automatically goes to principal. Ask the lender how extra payments are applied before relying on a payoff estimate.
Use the payoff date as a planning marker, not a contract promise. Actual payoff can shift if payment dates, fees, rate changes, or extra payments differ from the assumptions entered here.
Why is my payment only an estimate? Real loan offers may include fees, payment timing rules, escrow, insurance, and lender-specific terms.
Do extra payments always help? Extra principal payments usually reduce interest on amortizing loans, but check whether your lender has prepayment limits or fees.