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Molixa

Mortgage Calculator

Real PITI, 3-scenario compare, extra-payment what-if, year-by-year chart.

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100% browser-side, your numbers never leave this tab

Loan basics

$
$
%
Real PITI: tax, insurance, PMI, HOA
$
$
%
$

PMI auto-disables when LTV reaches 80%. Defaults: 1.1% tax, 0.35% insurance of home price.

Extra payment what-ifoverkill feature
$
Total monthly payment (PITI + HOA)
$2,819
Loan: $360,000 · LTV: 80.0% · 30-year fixed at 6.5%

Monthly breakdown

Principal + interest$2,275
Property tax$413
Home insurance$131
Total interest
$459,160
Total cost
$819,160
Payoff
30 yr
LTV at start
80.0%

Year-by-year principal vs interest

07k14k20k27ky1y6y11y16y21y26y30
Principal Interest
Free, no signup, no broker emails

The mortgage calculator that compares 3 scenarios at once

Real PITI: principal, interest, tax, insurance, PMI, HOA. Lock up to 3 scenarios and see them side-by-side. Extra-payment what-if with payoff date and interest savings. Year-by-year chart and downloadable CSV schedule.

How it works

Step 1

Enter your numbers

Home price, down payment, rate, term. Tax, insurance, PMI, and HOA optional but recommended for a real PITI total.

Step 2

Compare scenarios

Lock the current numbers as Scenario A. Change rate or term, lock another, compare 3 side-by-side. Most calculators only show one at a time.

Step 3

What-if extra payments

Add a monthly extra and see how many years earlier you pay off plus how much interest you save. Interactive chart updates live.

Every feature, free

Side-by-side comparison

Lock up to 3 scenarios and see them in one view: rate, term, extras, monthly payment, total interest, payoff date. Bankrate and NerdWallet show one at a time and force you to remember the previous numbers.

Real PITI breakdown

Principal + interest + property tax + home insurance + PMI + HOA. The total monthly figure most calculators forget. PMI auto-disables when LTV reaches 80 percent (federal law for conventional loans).

Extra-payment what-if

Type any monthly extra. The calculator re-runs the amortization, shows payoff months saved + total interest saved. Optionally start the extra at month X (eg after a bonus or raise).

Year-by-year stacked chart

Visual breakdown of each year's principal vs interest split. Hover any year for the exact numbers. Shows you why early years feel like all interest (because they are).

Downloadable amortization

Full month-by-month schedule with payment, principal, interest, PMI, balance. CSV export for Excel or Google Sheets. Drops into your own model with one click.

Down payment %

Type either the dollar amount or the percentage and the other updates. Easy to model 'what if I put down 25 percent instead of 20'.

LTV display

Loan-to-value shown at the top so you can see at a glance whether you'll need PMI and how close you are to dropping it.

100% browser-side

Your inputs never leave the tab. No analytics event with your numbers, no mortgage-broker affiliate cookie. Close the tab and the numbers are gone.

Why we built this

No broker emails

Bankrate and NerdWallet collect your inputs to feed broker partner emails. We don't, because we don't have a server. The whole tool is JavaScript that runs in your browser.

Compare in one screen

Most home-buying decisions are 'which scenario'. 15 vs 30 year. 5 percent down vs 20 percent down. Rate buy-down or no. We show all three side-by-side instead of forcing you to flip back and forth.

Real, not lossy, numbers

We model PMI drop-off. We model property tax + insurance + HOA. We let you start the extra payment at month X. Most basic calculators round these things into one P&I number that's 30 percent low.

No ads, no upsells

No 'apply now' button. No banner ad above the form. No 'compare lenders' affiliate link disguised as a feature. Just the math you came for.

Molixa vs Bankrate, NerdWallet

FeatureMolixa Mortgage CalculatorBankrateNerdWallet
Free, no signupYesYes (with broker emails)Yes (with broker emails)
Side-by-side scenariosUp to 3One at a timeOne at a time
Real PITI defaultP&I + tax + insurance + PMI + HOAP&I, others as togglesP&I + tax + insurance
PMI auto drop-off at 80% LTVYesNoPartial
Extra-payment what-if with start monthYesBasic onlyBasic only
Year-by-year stacked chartYes, interactiveStaticStatic
CSV export of scheduleYesPrint-onlyNo
Privacy100% browser-sideServer-collectedServer-collected
Ads / affiliate linksNoneAd-supportedAd-supported

What people use it for

Decide between 15-year and 30-year

Lock 15-year at the lower rate as Scenario A. Lock 30-year at the higher rate as Scenario B. Compare total interest, monthly payment, and lifetime cost.

See if rate buy-down is worth it

Lock current rate as Scenario A. Lock the bought-down rate (with the cost reflected in down payment) as Scenario B. Compare lifetime cost difference.

Plan extra payments around a bonus

Set extra monthly to your bonus / 12. Set start month to month 3 (or whenever the bonus actually lands). See payoff date move.

Refinance break-even

Scenario A: current loan, current rate. Scenario B: new loan, new rate, plus closing costs added to balance. Compare lifetime cost difference and payoff date.

Affordability check

Type the price, your down payment, current market rate. Look at the total monthly. Multiply by 3 to estimate gross monthly income needed (the 28% rule of thumb).

Strategy comparison

How much faster does $200/mo extra pay it off vs $500/mo extra vs a 15-year refinance? Model all three side-by-side.

Walkthroughs

Compare 15-year vs 30-year in 30 seconds

  1. 1Enter home price, down payment, and the 30-year rate. Term: 30.
  2. 2Click 'Lock as Scenario A'.
  3. 3Change Term to 15 years. Drop the rate by 0.5 percent (typical 15yr discount).
  4. 4Click 'Lock as Scenario B'. The Compare tab shows both side-by-side.

See exactly when PMI drops off

  1. 1Enter your home price and a down payment under 20 percent. Note the LTV in the summary.
  2. 2Switch to the Schedule tab. Scroll until the PMI column shows '-' instead of a number.
  3. 3That's the month PMI drops off. Federal law for conventional loans.
  4. 4Multiply remaining payments by your monthly PMI to see how much PMI cost you in total.

Find the optimal extra payment

  1. 1In the extras section, type $100 monthly. Note the months saved and interest saved.
  2. 2Try $200, $500, $1000. Each increment saves less per dollar than the last.
  3. 3Find the sweet spot where you're saving real interest without straining cash flow.
  4. 4Lock as a scenario to compare against no-extra in the Compare tab.

Reverse-calculate affordability

  1. 1Decide your max comfortable monthly: total monthly = 28 percent of gross monthly income is the rule of thumb.
  2. 2Adjust home price up or down until the total monthly matches.
  3. 3Make sure to leave the tax, insurance, PMI, and HOA fields filled (real numbers for the area you're shopping).
  4. 4The price you land on is your affordability ceiling at the rate you modeled.

Privacy + security

Your numbers never leave your browser

The whole calculator is JavaScript that runs in your tab. Your home price, income, savings, and any other input you type is computed locally and shown locally. We have no server endpoint that receives mortgage inputs because we have no server.

Most popular mortgage calculators (Bankrate, NerdWallet, Zillow) collect your inputs and tie them to your IP, then sell or share them with mortgage broker partners. The 'free apply' button is the product. Our tool genuinely is the product, free of that incentive.

Who it's built for

First-time home buyers

See the real PITI total before you fall in love with a house. Compare what 5 percent vs 20 percent down does to PMI and your total monthly.

Refinance shoppers

Lock current loan as Scenario A, new offer as Scenario B. Compare total cost, payoff date, monthly difference. See break-even for closing costs.

Real estate agents

Show clients an honest payment estimate including PMI and tax, not the broker's optimistic 'just P&I' number. Bookmark, no signup.

Personal finance nerds

Model extra payments, refinance, term changes, rate buy-down. Export the schedule to CSV and feed it into your own spreadsheet.

Questions people ask

Is the mortgage calculator free?
Yes. Unlimited use, no signup, no daily cap, no ad interstitials. The whole tool runs in your browser, so there is no per-user cost. Bankrate and NerdWallet are also free, but they collect your inputs to feed mortgage-broker partner emails. We don't, because we have no server to collect anything.
What is PITI?
Principal, Interest, Tax, Insurance. Your real monthly mortgage payment is PITI plus PMI (if applicable) plus HOA. Most basic calculators only show P&I, which is typically 60-70 percent of what you'll actually pay each month. We default to a complete PITI breakdown so you don't get surprised by 'why is my real payment $400 more than the calculator said'.
What's the difference between this and Bankrate?
Three things. (1) Side-by-side scenarios: lock the current numbers as Scenario A, change rate or term, lock another, compare 3 in one view. Bankrate shows one at a time. (2) Real PITI breakdown by default with PMI auto-disabling at 80% LTV. Bankrate shows P&I and adds the others as toggles. (3) Extra-payment what-if with payoff date and interest savings, plus an interactive year-by-year chart showing where each dollar goes.
How does PMI work?
Private Mortgage Insurance is required when your loan-to-value ratio is above 80 percent (you put down less than 20 percent). It's typically 0.3 to 1.5 percent of the loan amount per year, charged monthly. Once your remaining balance drops below 80 percent of the original home price, PMI is dropped automatically (this is federal law for conventional loans). Our calculator factors PMI in at the start and removes it at the right month. Most basic calculators don't model the drop-off.
Should I pay extra each month?
Usually yes, but it depends on your interest rate vs. what you'd earn elsewhere. If your mortgage rate is 7 percent and you can earn 5 percent in a high-yield savings account, paying down the mortgage gives a guaranteed 7 percent return. If you can earn 10 percent in your investment portfolio, the math flips. Use the extra-payment what-if section to see the exact interest you'd save and the months earlier you'd pay off, then compare to your alternative returns.
What's the difference between 15-year and 30-year terms?
15-year mortgages have lower interest rates (~0.5-0.75 percent lower) and dramatically less total interest, but higher monthly payments. 30-year mortgages have lower monthly payments but you pay roughly twice as much in total interest. A common middle ground: take the 30-year, then make the extra-payment equivalent of a 15-year. Use the side-by-side compare to see the exact tradeoff for your numbers.
Can I export the amortization schedule?
Yes. Switch to the Schedule tab and click Download CSV. You get every month with payment, principal, interest, PMI, and remaining balance. Drops straight into Excel or Google Sheets for your own modeling.
What rate should I use if I don't know my exact rate yet?
For a rough estimate, use the current 30-year fixed average from Freddie Mac (publicly available). Rates also vary by credit score: 740+ gets the best rates, 660-739 typically pays 0.25-0.5 percent more, below 660 may pay 1-2 percent more or struggle to qualify. Add a small buffer (eg if the average is 6.5 percent, model 6.75 percent) to be safe. Lock in the actual rate when you're ready to apply.
Is my data sent to anyone?
No. The whole calculator runs in your browser. Inputs never leave the tab. There is no API call, no analytics event with your numbers, no broker affiliate cookie. Close the tab and the inputs are gone. This is the privacy guarantee we can actually keep because the tool genuinely does not have a server.
What about ARMs, VA loans, FHA, jumbo, refinance?
This calculator handles standard fixed-rate mortgages (conventional or FHA-style). For ARMs (adjustable rates), the math gets more complex because the rate changes after a fixed intro period; that's a separate tool we may add. VA and USDA loans have different PMI rules (no PMI but a funding fee) which can be approximated by setting PMI to 0 and adding the funding fee to closing costs. For refinance break-even, set up two scenarios: current loan vs. new loan, compare total cost differences.

Try it now

Real PITI, side-by-side scenarios, no broker emails

Free. No signup. No 'apply now' upsell. Just the mortgage math you came for.

Start calculating
Built and reviewed bySaqib Zahoor, WeboTech Studio
Last updated:

The Mortgage Calculator page is built, reviewed, and maintained by the Molixa team. We use the tool we ship and update the docs when the behavior changes.

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