Loan Calculator

Interest Rates (APR vs. APY): Interest is the fee charged by lenders for borrowing capital. APR (Annual Percentage Rate) incorporates both interest rate and lender fees into a single annual percentage. Conversely, APY (Annual Percentage Yield) includes compounding frequency and is typically used for savings accounts and investments.

Compounding Frequency: Compound interest is calculated on both the original principal and past accrued interest. More frequent compounding (e.g. daily or monthly vs annually) slightly increases total borrowing cost.

Loan Term Impact: Longer loan terms reduce monthly installment amounts but significantly increase cumulative interest paid over time. Shorter terms require higher monthly cash outlays but result in massive interest savings.

This calculator uses the standard amortization formula used by banks and lenders worldwide: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is your loan principal, r is the periodic interest rate, and n is the total number of scheduled payments over the loan term. This formula produces a level payment amount that, when paid every period, exactly pays off both principal and interest by the final installment.

Because this tool lets you choose a payment frequency independently from a compounding frequency — for example, monthly payments with quarterly compounding — it does not simply divide your annual rate by twelve when the two frequencies differ. Instead it first computes an equivalent periodic rate using (1 + r_compounding)^(compFreq / payFreq) − 1, so the payment amount stays mathematically consistent with how interest actually accrues rather than approximating it.

Every calculation also runs a full period-by-period simulation, tracking the interest and principal portion of each installment, any extra payment applied that period, and the remaining balance afterward. This is what powers the amortization table, the balance-over-time chart, and the payoff date shown in the summary cards — every number you see is derived from the same simulation rather than a separate simplified estimate.

Start by selecting a loan preset that matches your situation — Personal, Home, Mortgage, Auto, Bike, Student, Business, or Custom — from the pill row above the calculator. Each preset pre-fills a realistic starting loan amount, interest rate, and term so you have a sensible baseline to adjust rather than starting from zero.

Next, enter your actual loan amount, interest rate, and term using either the number fields or the sliders beneath them. If you have specific fees — an origination fee, processing fee, yearly insurance, or taxes — expand the "Fees, Grace Period & Extra Payments" panel to add them; leaving them at zero is fine if they do not apply to your loan.

Click "Calculate Loan" to generate your results. The hero card at the top shows your scheduled payment broken into principal, interest, fees, and any extra payment you specified, while the summary grid below shows total interest, total repayment, payoff date, and total installment count. Scroll down for the full amortization schedule, which you can filter, page through, or export to CSV or Excel.

Prospective borrowers comparing offers from multiple lenders use this tool to see the real cost difference between two interest rates or terms before signing anything, since a lower monthly payment on a longer term often means paying substantially more in total interest. The built-in Loan Scenario Comparison panel is built specifically for this — enter your current loan's terms as Scenario A and an alternative rate or term as Scenario B to see the interest difference instantly.

Borrowers already repaying a loan use the Extra Payment Analysis section to decide whether adding a fixed amount to their monthly principal is worth it — the calculator shows exactly how much interest that habit would save and how many months it would shave off the payoff date, based on the same amortization engine used for the main schedule.

Financial advisors, loan officers, and students learning about amortization also use tools like this to illustrate how compounding frequency, fees, and grace periods affect total borrowing cost, since adjusting any single input immediately recalculates every downstream number.

Every dollar entered in "Extra Monthly Principal Payment" is applied directly against your outstanding principal balance in that period's simulation, on top of your regularly scheduled payment. Because interest for each period is calculated on the remaining balance, a lower balance going into the next period means a smaller interest charge that period — the savings compound over the life of the loan rather than simply totaling the extra dollars paid.

This is why the "Interest Saved" and "Time Saved" figures in the Extra Payment Analysis panel are often larger than borrowers expect relative to the extra amount entered, particularly earlier in a loan's term when the outstanding balance — and therefore the interest portion of each payment — is at its highest.

The Compare Loans panel lets you hold your current loan amount fixed while testing a different interest rate and term against it, producing a direct side-by-side of monthly payment, total interest, and total repayment for both scenarios. This is particularly useful when a lender offers a lower rate in exchange for a shorter term, or when deciding between a lender's standard offer and a promotional rate with different conditions.

Because both scenarios run through the identical amortization engine, the comparison isolates the effect of the specific variables you changed rather than mixing in rounding differences or simplified estimates that could occur if you compared calculations from two separate tools or spreadsheets.

This calculator computes results based on the exact figures you enter and standard amortization mathematics — it does not know your actual credit approval terms, and a lender's final offer can differ based on underwriting, points, or rate locks not reflected in a simple rate and term. Treat the output as an accurate mathematical projection of the numbers you input, not a guaranteed quote from any specific lender.

Fees such as origination charges and processing fees are added to your periodic payment display as flat dollar amounts entered by you, but how a real lender actually structures fees — rolled into the loan balance versus charged upfront — can vary and will shift your true effective APR slightly differently than a simple addition. For a binding cost comparison, always cross-check figures against your lender's official loan estimate or disclosure documents.

My calculated payment looks different from my bank's quote — Double-check that your compounding frequency selection matches what your lender actually uses, and confirm whether your lender's quoted payment already includes taxes, insurance, or fees the way this calculator's "Total" figures do. A mismatch in any one of these inputs is the most common cause of a discrepancy.

The validation alert appears and blocks calculation — This means one of your inputs is out of an acceptable range, such as a loan amount of $0, an interest rate outside 0%–100%, or a term of zero months. Check the highlighted fields and adjust the value shown in the alert message.

The Extra Payment Analysis numbers seem too optimistic — These figures assume you consistently pay the extra amount every single period for the life of the loan. If you plan to only pay extra occasionally, reduce the "Extra Monthly Principal Payment" figure to a realistic average, or set it to zero to see your baseline schedule without assumptions.

Building an amortization schedule by hand in a spreadsheet requires writing the correct compound-interest formula, dragging it down for every period, and manually re-deriving it whenever you want to test extra payments, a grace period, or a different compounding frequency. A single formula error can silently throw off every subsequent row, and most spreadsheet templates do not attempt to model extra payments or side-by-side scenario comparison at all.

A bank's own online calculator, when available, is typically limited to that bank's specific loan products and rarely lets you freely compare an entirely different rate, term, or fee structure side by side. This calculator is lender-agnostic: because it runs entirely from the standard amortization formula rather than any single institution's internal pricing engine, you can model any combination of loan amount, rate, term, fees, and extra payments to understand the underlying mathematics before you ever apply.

All of this runs instantly in your browser as you adjust inputs, with no account creation, no email capture, and no waiting for a page reload between changes — a meaningful convenience when you want to quickly test several "what if" scenarios back to back before committing to a real loan application.