03
SCENARIOS
Test the rate
Bump rate +0.25%. Switch 30-yr to 15-yr. Add a bigger down payment. Compare instantly.
What it actually does
02
SCHEDULE
Full amortization curve
Month-by-month split between principal and interest. See why early payments are mostly interest and the curve flips around year 18 on a 30-year loan.
04
PRIVATE
No email gate
Your numbers never leave your tab. No lender follow-ups.
How it works
- Open morph.cool/calculator/mortgage in any modern browser. No login, no email gate, no broker reroute.
- Enter loan terms: home price, down payment, interest rate, term in years. Defaults seed reasonable numbers.
- Read the monthly payment — principal and interest broken out, plus total interest over the life of the loan.
- Open the amortization schedule. Month-by-month split, balance trajectory, year-by-year totals.
- Test scenarios. Bump the rate up a quarter point. Switch to a 15-year term. See how the curve shifts.
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360 rows30-year amortization
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Why every "mortgage calculator" in search exists
Bankrate, NerdWallet, Zillow, Rocket Mortgage, LendingTree — the entire first page of "mortgage calculator" search results is owned by lead-generation sites. Type a price, get a number, then field three follow-up emails from a "loan officer who can help." The math is correct because amortization is a 19th-century formula, but the surface around the math is built to harvest you. Morph runs the same formula in your tab, gives you the same number plus a full schedule, and forgets the inputs the moment you close the page.
What this calculator doesn't include
Property tax, homeowners insurance, PMI, and HOA dues vary by region, lender, and property — they're excluded by default to keep the math honest about what's actually mathematical (P&I) versus what's situational. ARMs (adjustable-rate mortgages) and interest-only loans aren't modeled — the calculator targets fixed-rate, fully amortizing loans, which is what most people actually take.
Frequently asked
What does the monthly payment include?
Principal and interest only — the core P&I figure. Property tax, homeowners insurance, PMI, and HOA dues vary by region and lender, so they are excluded by default. Add them manually for a true monthly housing cost.
How is the payment calculated?
Standard amortization formula: M = P × r(1+r)ⁿ / ((1+r)ⁿ - 1), where P is the loan amount, r is the monthly interest rate, and n is the total number of payments. Morph runs the math in your browser.
Does Morph store my numbers?
No. The calculation happens client-side. Nothing is transmitted, nothing is logged, nothing persists when you close the tab.
How accurate is the result?
The principal and interest figure is mathematically exact for a fixed-rate loan. Real-world payments often include taxes, insurance, and PMI in escrow — add those separately for a complete picture.
Can I see the full amortization schedule?
Yes. Morph shows the month-by-month breakdown of how each payment splits between principal and interest, and how the balance shrinks. Useful for seeing why early payments are mostly interest.
What about ARMs or interest-only loans?
The calculator targets fixed-rate, fully amortizing loans — the most common mortgage. ARMs reset rate periodically and are not modeled. For an ARM, calculate each rate period separately.
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