Mortgage Calculator
The mortgage calculator estimates the monthly payment and total cost of a home loan from the home price, down payment, interest rate, and loan term. It calculates the loan amount, loan-to-value ratio, total payment, and total interest. The year-wise amortization table shows how the loan balance falls, while the chart separates down payment, borrowed principal, and interest cost.
How to Use
- Enter the home price exactly as it appears in your bank statement, quote, invoice, or planning sheet. Use the same currency throughout the calculator.
- Enter the annual mortgage interest rate as a plain number, not as a fraction or text label. Percent fields should use 8 for 8%, not 0.08.
- Complete the remaining fields for the down payment and loan term and check units such as years, months, per-unit price, or number of people before calculating.
- Select Calculate to produce monthly payment, loan amount, total cost, total interest, and LTV ratio. The result cards separate the main answer from supporting figures so the calculation is easier to audit.
- Review the formula, worked example, and reference table before using the result in a financial decision, quotation, or repayment plan.
Formula
Mortgage Calculator calculations are useful because they turn a financial question into named variables. The calculator does not guess hidden assumptions: each number in the formula comes from a field in the widget, and every percentage is converted to decimal form before arithmetic is applied. This matters because a misplaced percent sign or mismatched time unit can change the answer dramatically.
When checking the formula manually, keep rates and periods aligned. Annual rates should be divided when the period is monthly, while year-based models should keep time in years. Currency symbols do not affect the arithmetic, but mixing currencies does. Round only the final displayed result; intermediate steps are best kept at full precision.
Worked Example
Suppose a home costs ₹50,00,000 and the down payment is ₹10,00,000. The loan amount is ₹40,00,000 and the LTV ratio is 80%. At 8.5% for 20 years, the monthly rate is 0.085 / 12. Using the EMI formula, the monthly payment is about ₹34,713. Total payments over 240 months are about ₹83,31,120, so interest is about ₹43,31,120. The true cash outflow also includes the initial down payment plus registration, taxes, insurance, and other closing costs.
Reference Table
| Term | Loan amount | Rate | Approx monthly payment |
|---|---|---|---|
| 10 years | ₹40,00,000 | 8.5% | ₹49,594 |
| 15 years | ₹40,00,000 | 8.5% | ₹39,391 |
| 20 years | ₹40,00,000 | 8.5% | ₹34,713 |
| 25 years | ₹40,00,000 | 8.5% | ₹32,210 |
| 30 years | ₹40,00,000 | 8.5% | ₹30,757 |
Practical Notes
The mortgage calculator is best treated as a planning calculator, not a promise from a lender, bank, broker, or merchant. Real finance decisions can include taxes, fees, minimum charges, statement cycles, exchange spreads, insurance, processing fees, and contractual rules that are not part of a clean textbook formula. Use the output to understand direction, scale, and sensitivity, then compare it with official documents before committing money.
A good way to use this page is to run more than one scenario. Change the rate, time, price, or cost by a small amount and observe how the result moves. If a small input change creates a large output change, the decision is sensitive and deserves more conservative assumptions. This is especially important for long tenures, leveraged purchases, high inflation periods, and business costs where cash flow timing matters.
Common Mistakes
Common errors include typing percentages as decimals, using months where years are expected, forgetting one-time fees, and comparing pre-tax and post-tax figures as if they were the same. Another frequent mistake is reading a rounded display value as an exact contract value. The calculator rounds for readability, but the underlying result can contain additional decimals.
Mortgage affordability also depends on property taxes, insurance, maintenance, association dues, and income stability. If the result looks too good, too low, or inconsistent with a bank quote, inspect the inputs first. Confirm the period, rate basis, compounding or repayment frequency, and whether a charge is included or excluded. These checks usually explain the difference before any advanced finance theory is needed.
FAQ
What is a mortgage?
A mortgage is a loan secured by real estate. The borrower receives money to buy a property and repays it through scheduled installments. If the borrower fails to repay according to the contract, the lender may have rights over the property. Mortgage payments usually include principal and interest, while taxes and insurance may be paid separately or through an escrow arrangement.
What is LTV ratio?
Loan-to-value ratio compares the loan amount with the property value. If a home costs ₹50,00,000 and the loan is ₹40,00,000, LTV is 80%. Lower LTV means a larger down payment and less lender risk. Lenders often use LTV to decide eligibility, rate, insurance requirements, and maximum loan size.
What is PMI?
PMI means private mortgage insurance in markets where lenders require insurance for higher LTV loans. It protects the lender, not the borrower, if the borrower defaults. India and other markets may use different terms or insurance structures, but the idea is similar: high leverage can add extra costs beyond the interest rate.
Fixed vs variable rate mortgage: which is better?
A fixed rate gives payment stability because the rate is locked for the agreed period. A variable rate can rise or fall with market benchmarks. Fixed rates help budgeting, while variable rates may be cheaper initially but carry reset risk. The better choice depends on rate outlook, income stability, and how long you expect to keep the loan.
How much can I afford to borrow?
Affordability depends on income, existing debts, emergency savings, down payment, credit profile, and non-loan housing costs. A lender may approve a high amount, but your personal comfort may be lower. Stress-test the payment with a higher rate or temporary income drop before deciding.