Loan calculator

Loan calculator estimates a level monthly payment from Loan amount, Annual interest percentage, and Term in years. It assumes the annual rate is divided by 12, the number of payments is years multiplied by 12, and one payment occurs each month. The nonzero-rate formula amortizes principal across those equal periods.

The model does not include origination fees, insurance, taxes, deposits, balloon payments, changing rates, payment holidays, daily interest, irregular dates, or extra payments. A lender's annual percentage rate may incorporate costs that the entered nominal rate does not. Compare the result with an official disclosure and repayment schedule.

Currency output is fixed to USD and uses locale-aware formatting with at most two decimals. The calculator does not convert currencies. Entering an amount denominated elsewhere still displays a dollar symbol, so label external comparisons clearly.

For a nonzero rate, monthly payment equals principal times monthly rate times one plus monthly rate raised to the payment count, divided by that power minus one. Monthly rate is annual percentage divided by 100 and then by 12. Payment count is term years times 12.

For a zero annual rate, the workbench uses principal divided by payment count. A $12,000 loan over 2 years has 24 payments of $500, total interest $0, and total paid $12,000. This branch avoids division by a zero monthly rate.

The formula assumes payments at regular month-end intervals and a rate that remains constant. It does not model a first payment on a broken period or a lender that compounds daily. Those details can change the contractual payment and interest total.

Enter 25000 as Loan amount, 6.5 as Annual interest, and 5 as Term. Monthly rate is 0.065 divided by 12, and payment count is 60. The formula gives an unrounded monthly payment of about $489.153705.

The page displays Monthly payment: $489.15. It multiplies the unrounded payment by 60 to calculate total paid, about $29,349.22, then subtracts principal for total interest of about $4,349.22. Payments displays 60.

A real schedule that rounds each monthly payment to cents may adjust the last payment. The page calculates totals from the unrounded payment and formats afterward. This can differ slightly from multiplying the displayed $489.15 by 60 or from a lender schedule with cent-level balance updates.

Use the same principal, term, and rate definition for each scenario. A lower payment created by a longer term can increase total interest. Compare Monthly payment, Total interest, and Total paid together rather than ranking offers by one line.

Check whether a quoted rate is nominal annual interest, APR, effective annual rate, or a promotional rate. This workbench treats the entry as a nominal percentage divided by 12. It cannot translate fees or alternative compounding into an equivalent comparison rate.

Account for down payments and financed fees in the principal only according to the actual offer. A purchase price is not necessarily the loan amount. Taxes, registration, closing costs, and insurance may be paid separately or financed under different terms.

The calculator has no extra-payment field. Paying additional principal can shorten a loan or reduce later interest, but the result depends on timing, lender allocation, prepayment rules, and whether the scheduled payment changes. Do not subtract an extra amount from the displayed total interest without an amortization schedule.

A biweekly plan is also not modeled by entering half the monthly payment. Some plans create 26 half-payments per year, while others simply collect funds and remit monthly. Fees and posting rules matter. Use a schedule that matches the lender's process.

Balloon and interest-only loans require other formulas. The fixed-payment output assumes full amortization across all entered months. If an agreement leaves principal due at the end, this page understates the final obligation.

The form accepts finite numbers but does not enforce positive principal, rate, or term. Zero years produces zero payments and can yield an infinite or undefined-looking amount. Negative terms and rates can create outputs that have no ordinary lending meaning. Enter a positive amount and term, plus the rate stated by the offer.

The Term field displays a step of one year, but typed values may still be interpreted numerically. A 0.5-year term becomes 6 payments. A value whose years times 12 is not a whole number can display a fractional payment count, even though real loans use discrete payments. Use terms that map to the agreement's actual month count.

Blank inputs can convert to zero. Fill every field explicitly and review them before calculating. Reset clears values, result, and error. It does not retain a scenario table, so record inputs alongside each copied output.

Check payment count first: years times 12. For zero interest, payment times count should equal principal. For positive interest, total paid should exceed principal and total interest should equal total paid minus principal, subject to display rounding.

Recalculate a shortlisted offer using the lender's official tool or disclosure. Ask how rate, fees, payment timing, and rounding are handled. The estimate is useful for scenarios but is not a quote, approval, affordability assessment, or financial recommendation.

Copying the result does not copy hidden assumptions from the code. Add principal, annual rate, years, payment frequency, currency, and calculation date to any decision record. A bare monthly payment cannot be audited later.

Compound interest calculator projects a balance with a starting amount and end-of-month contributions. Loan calculator solves for a payment that amortizes debt. The signs and cash-flow purpose differ, so one should not substitute for the other.

Percentage calculator can find a simple rate change but does not compound across periods. Discount and VAT pages apply one rate to a price. None includes a loan payment schedule or financed fees.

Use this estimator to compare simple fixed-rate monthly scenarios, then verify with the provider. For variable rates, irregular payments, fees, or prepayment, use an amortization model that matches the contract and review consequential decisions with a qualified adviser.

Run separate cases while holding principal fixed. Increasing the annual rate raises payment and total interest under a fixed term. Extending the term usually lowers payment but adds payment periods and can raise total interest. The tool does not place scenarios side by side, so label copied outputs.

Small rate differences can matter across many months. Compare offers using exact quoted rates and matching terms rather than rounded marketing figures. A monthly payment alone can hide a longer repayment period.

Affordability depends on income, expenses, risk, and other obligations that this page does not collect. A lower calculated payment is not a recommendation to borrow or evidence of approval.

Variable-rate products need several rate paths and contract caps. This fixed-rate formula cannot predict future resets. Use lender disclosures and stress testing appropriate to the product.

A full schedule begins each month with balance times monthly rate as interest, applies the remainder of payment to principal, and carries the new balance forward. Repeating that process should approach zero after the entered payment count, subject to rounding.

This page reports totals but no monthly breakdown. It cannot show early interest share, remaining balance after a date, or payoff amount. Use a schedule when those questions matter.

Lenders may round interest and principal each period, change the last payment, or use actual calendar days. Compare schedule assumptions before treating a cent difference as an error.

For verification, confirm Total paid minus Loan amount equals Total interest using unrounded values. Displayed currency rounding can make manual multiplication of payment by months differ slightly.

Keep the official agreement and schedule. The calculator is an independent estimate and does not modify contractual obligations.

A payment-date mismatch can change interest when a lender uses daily accrual. This page treats every month as one equal rate period and has no calendar dates. It cannot quote a payoff on a specific day.

Fees paid upfront should not automatically be added to principal, while financed fees may increase it. Follow the offer's cash-flow treatment and compare APR through an appropriate disclosure model rather than guessing.

A zero-rate benchmark is useful for checking term entry. Principal divided by years times 12 should match the displayed payment before rounding. If it does not, inspect parentheses and payment count in the independent check.

For the five-year example, multiplying the unrounded $489.153705 payment by 60 produces about $29,349.22. Subtracting $25,000 confirms about $4,349.22 interest. Use unrounded payment for this check.

Early schedule payments contain more interest than later ones under the amortization model, even though the payment stays level. Total interest does not imply equal interest each month.

The result has no due-date, late-fee, default, or prepayment information. Those contract terms can be more consequential than a small difference between estimates.

When sharing comparisons, include provider, product type, principal, rate definition, term, payment frequency, fees considered, and retrieval date. Rates and offers can expire.

Payment count is displayed without rounding. If a fractional year creates a fractional month count, that output is a warning that the term does not map cleanly to monthly payments. Enter the actual contractual months through an equivalent whole-year value only when the conversion is exact; otherwise use a calculator with a month field.

Negative or zero rates may exist in unusual products, but this page is not designed to interpret them. Confirm the formula and contract rather than accepting an odd output because it is formatted as currency.