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Mortgage Calculator

Calculate mortgage interest and repayment

A mortgage is a long-term loan secured against real property. Borrowers repay principal and interest over an agreed schedule. Amortisation, the systematic reduction of debt, allocates each payment into interest and principal parts. Understanding these mechanics clarifies true borrowing costs and supports sound budgeting for future commitments and emergencies. Accurate estimates underpin informed negotiations.

Use the Mortgage Calculator to model payments quickly. Enter purchase price, down payment, loan term, and annual rate. The tool derives monthly instalments, total cost, and interest with standard amortisation formulas. Instant recalculations encourage scenario testing, lender comparisons, and proactive refinancing discussions before signing contracts. Clear outputs build borrower confidence.

Apply the insights before approaching lenders, during property negotiations, or while evaluating early repayment options. Financial planners rely on similar breakdowns to illustrate affordability and risk. Because all computation stays local, your sensitive figures remain private. Revisit the tool regularly to track rate changes and adjust budgets with minimal effort and zero paperwork.

No data is transmitted or stored server-side.

Technical Details:

This section lists crucial capabilities for precise mortgage evaluation.

  • Handles dollar or percent down payments.
  • Supports loan terms from one to forty years.
  • Calculates monthly, total, and interest payments.
  • Updates results instantly as you type.
  • Uses industry-standard amortisation formula.
  • Highlights effective loan amount after down payment.
  • Works offline to safeguard personal data.
  • Rounds outputs for quick budgeting.
SymbolDescription
PLoan principal after down payment
rMonthly interest rate
nTotal number of monthly payments
MMonthly repayment amount

Calculations-and-Scoring:

The subsections clarify amortisation mathematics.

Formula Breakdown

M = P × [r / (1 − (1 + r)−n)]. Total Payment = M × n. Interest Paid = Total Payment − P.

Worked Example

A $300 000 loan at 4 % for 30 years results in roughly $1 432 monthly payments.

Interpretation

The formula emphasises how longer terms lower monthly costs but raise total interest.

Recommendations

Compare different rates and terms to balance affordability and long-term expenses.

Step-by-Step Guide:

Complete the steps to estimate your mortgage obligations.

  1. Enter the property purchase price.
  2. Specify the down payment value.
  3. Select dollar or percent for the down payment.
  4. Set the loan term in years.
  5. Input the annual interest rate.
  6. Tip Adjust values to compare multiple scenarios.

FAQ:

Find concise answers to common questions.

Does the calculator include taxes or insurance?

No, results cover principal and interest only. Add local taxes and insurance separately.

Can I enter bi-weekly payments?

The current version models monthly schedules. Convert bi-weekly figures to monthly equivalents for estimates.

Why is down payment type important?

Percent down payments scale with price, while dollar amounts remain fixed, affecting principal size.

Is my financial data sent to servers?

No. All calculations happen within your browser session for privacy.

How accurate are the rounded outputs?

Values round to whole dollars for readability. Minor differences appear during real lender amortisation.

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