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Calculator Guide

How to use the Mortgage Calculator

Model any home loan — payments, extra payments, ARM tranches, PITI, and side-by-side scenario comparisons.

01/ 08
Enter your loan basics
  1. Enter your loan basics
    ~1 min
    Original amount
    $280,000
    Down payment
    $70,000
    Annual rate
    7.25%
    Total term
    30 years (pick 10/15/20/25/30 or type your own)

    Start with the loan amount you are borrowing (the "Original amount") and your down payment. As you type the down payment, the calculator shows your Loan-to-Value (LTV) ratio in real time — important for knowing when PMI can be dropped. Pick a term from the preset buttons (10, 15, 20, 25, 30 years) or type a custom one. Your monthly Principal & Interest (P&I) updates instantly on the right.

    💡 Tip: Enter your loan amount and rate first to see the core payment, then adjust the term — a shorter term raises the monthly payment but slashes total interest.

    Principal
    $200,000
    Term
    30 years
    Rate
    6.5%
    Months paid
    12 mo
  2. Add PITI costs for a realistic total
    ~1 min
  3. Simulate extra payments
    ~2 min
  4. Model an Adjustable Rate Mortgage (ARM)
    ~1 min
  5. Compare up to 4 loan scenarios side by side
    ~1 min
  6. Use the Refinance sub-tab
    ~2 min
  7. Find out how much house you can afford
    ~1 min
  8. Generate and download your report
    ~1 min
01 of 08

For educational purposes only. Results are mathematical simulations — not financial advice. Consult a qualified professional before making financial decisions.