Loan Calculator
Free loan calculator to find the repayment plan, interest cost, and amortization schedule of conventional amortized loans, deferred payment loans, and bonds.
How to Use the Loan Calculator
Choose a loan type: Amortized (fixed payments), Deferred (single lump sum at maturity), or Bond (predetermined face value). Enter the loan amount, annual interest rate, term, and compounding frequency. Click Calculate to see monthly/annual payment, total interest, and total amount owed. Use this for mortgages, auto loans, personal loans, student loans, or bonds.
Types of Loans
Loans are categorized by repayment structure. Amortized loans spread payments evenly over time—principal and interest combined in each payment. Deferred payment loans (balloon loans) require a single large payment at maturity with minimal interim payments. Bonds pay a predetermined amount at maturity, often with coupon interest payments. Most consumer loans are amortized (mortgages, auto loans, personal loans). Commercial loans often use deferred structures. Understanding your loan type affects financial planning and budgeting.
Secured vs Unsecured Loans
Secured loans require collateral (home, car, equipment). If you default, the lender seizes the asset. Secured loans have lower interest rates (less lender risk) and higher borrowing limits. Unsecured loans require no collateral but have higher interest rates and lower limits. Examples: secured = mortgages, auto loans; unsecured = credit cards, personal loans. Lenders may require a co-signer for unsecured loans. Building good credit helps you qualify for better unsecured rates.
The 5 C's of Credit
Lenders evaluate loans using five criteria: Character (credit history, payment track record, reliability), Capacity (debt-to-income ratio, ability to repay), Capital (savings, assets, down payment), Collateral (items pledged as security), and Conditions (economic climate, loan purpose, market trends). Strong performance across all five improves approval odds and loan terms. Character is often most important—consistent on-time payment history demonstrates reliability. Capacity ensures you can afford payments. Capital shows skin-in-the-game commitment.
APR vs Interest Rate
Interest Rate is the pure cost of borrowing principal. APR (Annual Percentage Rate) includes interest plus all fees, points, broker fees, and closing costs, expressed as an annual percentage. For major loans like mortgages, APR can differ significantly from interest rate—sometimes by 0.5–1%. APR gives the true borrowing cost. Always compare APRs when shopping for loans, not just interest rates. Federal Truth in Lending Act requires disclosure of APR.
Computing Monthly Payments
For amortized loans, the monthly payment formula is: PMT = [P × r(1+r)^n] / [(1+r)^n − 1], where P = principal, r = monthly rate (annual ÷ 12), n = number of payments. Each payment includes interest (calculated on remaining balance) and principal reduction. Early payments are mostly interest; later payments mostly principal—this is amortization. Longer terms mean lower monthly payments but higher total interest. Shorter terms mean higher payments but less total interest.
Bonds and Fixed Income Instruments
Bonds are debt instruments—you lend money to a borrower (company or government) who promises to repay with interest. Face/Par value is the amount repaid at maturity. Coupon rate is the annual interest payment, usually semi-annual. Zero-coupon bonds pay no interim interest but sell at deep discounts. Bond prices fluctuate inversely with interest rates—when rates rise, bond prices fall, and vice versa. Conservative investors prefer bonds for steady income; growth investors prefer stocks. Bond ratings (AAA to C) indicate credit quality and default risk.
Managing Multiple Loans
When managing multiple loans, prioritize by interest rate. Pay minimums on low-rate loans and put extra funds toward high-rate debt—this is the "avalanche method." Alternatively, pay off smallest balance first for psychological wins (snowball method). Consider refinancing high-rate loans if rates drop. Consolidating multiple loans may reduce monthly payments but extends term (usually more total interest). Use calculators to compare strategies. Keeping all payments current maintains your credit score, enabling better refinancing opportunities.
Frequently Asked Questions
What is an amortized loan?+
An amortized loan has regular payments (usually monthly) where each payment includes principal and interest. Common examples: mortgages, auto loans, personal loans. The balance decreases over time until fully paid.
What is a secured vs unsecured loan?+
Secured loans require collateral (home, car, etc.). If you default, the lender can seize the asset. Unsecured loans (credit cards, personal loans) have no collateral but higher interest rates and stricter approval.
What are the 5 C's of credit?+
Lenders evaluate: (1) Character—credit history & reliability, (2) Capacity—debt-to-income ratio, (3) Capital—savings & assets, (4) Collateral—items pledged, (5) Conditions—lending climate & loan purpose.
What is APR vs Interest Rate?+
Interest Rate is the cost of borrowing principal only. APR (Annual Percentage Rate) includes interest plus fees (broker fees, points, closing costs). APR gives a more complete picture of total borrowing cost.
What is a deferred payment loan?+
A deferred payment loan has a single large payment due at maturity, with little-to-no payments beforehand. Common in commercial loans and balloon loans. Interest accrues throughout the term.
How do I choose between amortized and deferred loans?+
Choose amortized for predictable cash flow. Choose deferred only when your cash flow or project timeline supports a large maturity payment.
What is a balloon payment risk?+
Balloon structures can create refinancing risk if market rates rise or credit conditions tighten before maturity.
Can I reduce loan interest without refinancing?+
Yes. You can usually pay extra principal on amortized loans to reduce balance faster and lower total interest.
Why do lenders check debt-to-income ratio?+
DTI helps lenders estimate repayment ability. Lower DTI usually improves approval odds and may qualify for better rates.
Does compounding frequency affect loan cost?+
Yes. More frequent compounding can increase effective borrowing cost, so compare offers on effective annual basis when possible.
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