Loan Calculator
Calculate loan payments, interest, and amortization for amortized loans, deferred payment loans, and bonds
Calculate with Loan Calculator
A loan is a contract between a borrower and a lender in which the borrower receives money (principal) that they are obligated to pay back in the future. Most loans can be categorized into three types:
- Amortized Loan: Fixed payments paid periodically until loan maturity
- Deferred Payment Loan: Single lump sum paid at loan maturity
- Bond: Predetermined lump sum paid at loan maturity (face value of a bond)
Amortized Loan: Paying Back a Fixed Amount Periodically
Use this calculator for common loan types such as mortgages, auto loans, student loans, or personal loans.
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Deferred Payment Loan: Paying Back a Lump Sum Due at Maturity
Use this calculator to compute the amount due at maturity for a loan where no periodic payments are made.
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Bond: Paying Back a Predetermined Amount Due at Loan Maturity
Use this calculator to compute the initial value of a bond/loan based on a predetermined face value.
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Assumptions
Use Loan Calculator for financial estimate planning when you need a clear estimate, transparent inputs, and a result you can review before taking the next step.
Worked example
When To Use Loan Calculator
- Start with a representative scenario in Loan Calculator so rates, dates, balances, or other key assumptions match the question you are comparing.
- Review whether the estimate matches the planning scenario before you use it for a budget, plan, or discussion.
Sample Input And Output Checks
- Start with inputs that match the real scenario, not only a rounded placeholder.
- Review amount, rate, term, timing, fees, tax treatment, and decision horizon before trusting the output.
- Use the result as an estimate to review against statements, lender terms, tax forms, quotes, or qualified advice when the decision is material.
About This Tool
Loan Payment Estimates and Input Assumptions
This loan calculator estimates payments and interest from the loan amount, term, interest rate, compounding frequency, and payment frequency you enter. It supports three structures: amortized loans with regular payments, deferred payment loans that are paid as a lump sum at maturity, and bond-style calculations that work backward from a known future due amount. Use the result to compare assumptions, then check actual loan documents for fees, variable-rate terms, prepayment rules, grace periods, and lender-specific payment posting.
Amortized Loan Results
In an amortized loan, each scheduled payment includes interest for the period and principal reduction. Early payments often contain more interest because the outstanding balance is higher. Later payments usually shift more toward principal as the balance declines. The table shows estimated payment, principal, interest, and remaining balance for each period. For a home-loan-specific version that also includes property taxes, insurance, PMI, HOA, and extra-payment scenarios, use the Mortgage Calculator.
Deferred Payment and Bond Scenarios
The deferred payment section estimates the amount due at maturity when no regular payments are made during the term. This can help model simple lump-sum repayment assumptions, but it does not account for fees, partial payments, capitalization rules, or default provisions. The bond section works in reverse: enter the future due amount, term, rate, and compounding frequency to estimate the initial principal value under those assumptions. Bond market pricing can also depend on yield, coupon structure, credit risk, taxes, and liquidity, which are outside this calculator.
Compounding and Payment Frequency
Compounding frequency controls how often interest is added to the balance or reflected in the effective rate. Payment frequency controls how often the borrower pays in the amortized-loan section. Monthly, biweekly, and weekly payment assumptions can produce different interest totals because the balance is reduced on a different schedule. When comparing offers, make sure the quoted rate, compounding method, payment timing, fees, and term are being compared on the same basis.
Using the Estimate Safely
Treat the output as a planning comparison, not a loan approval, payoff quote, or financial advice. The calculator does not model origination fees, late fees, credit insurance, tax treatment, refinancing costs, changing rates, deferment programs, income-based repayment, or lender allocation rules. If you are managing several balances at once, compare the single-loan result with the Debt Payoff Calculator. If a new loan is being considered to combine debts, the Debt Consolidation Calculator can model that separate scenario.
Common result checks
Questions about this tool
- Which loan type should I use in this calculator?
- Use amortized loan for fixed installment payments, deferred payment loan when the balance is paid as one lump sum at maturity, and bond when you know the future due amount and want to estimate the starting principal.
- How does compounding frequency affect the estimate?
- Compounding frequency changes how often interest is converted into balance growth. More frequent compounding can increase total interest when other inputs stay the same.
- Why can payment frequency change total interest?
- Weekly or biweekly payments divide repayment into more periods. Depending on the rate and schedule, this can reduce the balance sooner than monthly payments and change estimated interest.
- Is this loan calculator financial advice?
- No. It is an estimate for comparing loan assumptions. Actual loans can include fees, variable rates, prepayment rules, late charges, and lender-specific terms that are not modeled here.