Mortgage Calculator & Amortization Schedule (PITI & PMI)
Comprehensive mortgage calculator with full PITI breakdown, automatic 78% LTV PMI drop-off countdown under the Homeowners Protection Act, and exportable schedule.
Calculation Parameters
<div>
<label for="loan-term" class="block text-xs font-bold text-slate-700 uppercase tracking-wider mb-2">Loan Term</label>
<select id="loan-term" class="w-full px-4 py-2.5 bg-slate-50 border border-slate-200 rounded-xl font-medium text-sm text-slate-900 focus:bg-white focus:border-blue-600 focus:ring-2 focus:ring-blue-100 outline-none">
<option value="30" selected>30 Years Fixed</option>
<option value="20">20 Years Fixed</option>
<option value="15">15 Years Fixed</option>
<option value="10">10 Years Fixed</option>
</select>
</div>
<div>
<label for="home-insurance" class="block text-xs font-bold text-slate-700 uppercase tracking-wider mb-2">Annual Homeowners Ins. ($)</label>
<div class="relative flex items-center">
<span class="absolute left-3.5 text-slate-400 font-semibold">$</span>
<input type="number" id="home-insurance" value="1500" step="50" class="w-full pl-8 pr-4 py-2.5 bg-slate-50 border border-slate-200 rounded-xl font-mono text-sm text-slate-900 focus:bg-white focus:border-blue-600 focus:ring-2 focus:ring-blue-100 outline-none" />
</div>
<span class="text-[10px] text-slate-400 mt-1 block">Hazard & fire coverage</span>
</div>
<div>
<label for="hoa-fee" class="block text-xs font-bold text-slate-700 uppercase tracking-wider mb-2">Monthly HOA / Dues ($)</label>
<div class="relative flex items-center">
<span class="absolute left-3.5 text-slate-400 font-semibold">$</span>
<input type="number" id="hoa-fee" value="0" step="25" min="0" class="w-full pl-8 pr-4 py-2.5 bg-slate-50 border border-slate-200 rounded-xl font-mono text-sm text-slate-900 focus:bg-white focus:border-blue-600 focus:ring-2 focus:ring-blue-100 outline-none" />
</div>
<span class="text-[10px] text-slate-400 mt-1 block">Condo / subdivision fees</span>
</div>
Privacy Guarantee: This calculation executes entirely in your browser memory. No personal numbers or financial parameters are logged or sent to any server.
Mathematical Formula & Notation
Standard US fixed-rate mortgage formula with PITI escrow components :
Worked Scenario: $450,000 Conventional Purchase (10% vs 20% Down)
Consider purchasing a home priced at $450,000 with a 30-year fixed conforming mortgage at 6.50% APR, 1.2% annual property tax ($450/mo), and $1,500/yr homeowners insurance ($125/mo):
- Scenario A (20% Down - $90,000): Financed balance is $360,000. Monthly Principal & Interest is $2,275.44. Adding $450 taxes and $125 insurance yields a total monthly payment of $2,850.44/mo. Zero PMI is required. * Scenario B (10% Down - $45,000): Financed balance is $405,000 (90% LTV). Monthly P&I rises to $2,559.87. Conventional lenders require PMI (0.85% p.a. = $286.88/mo). Total monthly payment is $3,421.75/mo. * Homeowners Protection Act (HPA) Automatic PMI Drop: Under federal law (12 U.S.C. § 4901), once your amortized loan balance reaches 78% of the original home value ($351,000)—which occurs at month 108 (year 9)—your lender must automatically terminate PMI, immediately dropping your monthly payment by $286.88.
Down Payment & Term Comparison ($450,000 Home Purchase at 6.50% Fixed)
| Down Payment | Loan Term | Monthly P&I | Initial Monthly PMI | Total Monthly PITI | Total 30-Yr Interest |
|---|---|---|---|---|---|
| 20% ($90k) | 30 Years | $2,275.44 | $0.00 | $2,850.44 | $459,158 |
| 10% ($45k) | 30 Years | $2,559.87 | $286.88 | $3,421.75 | $516,553 |
| 5% ($22.5k) | 30 Years | $2,702.09 | $329.91 | $3,607.00 | $545,251 |
| 20% ($90k) | 15 Years | $3,135.53 | $0.00 | $3,710.53 | $204,395 (Saves $254k interest) |
Frequently Asked Questions
What is PITI and why do mortgage lenders use it? ▼
PITI stands for Principal, Interest, Taxes, and Insurance. It represents the complete monthly housing expense required to hold the property. Lenders evaluate your debt-to-income (DTI) ratio against your total PITI rather than just the principal and interest to ensure your overall housing budget remains affordable.
When does Private Mortgage Insurance (PMI) get cancelled? ▼
Under the federal Homeowners Protection Act of 1998, you have the legal right to request PMI cancellation when your loan balance reaches 80% of the original property value. If you make regular scheduled payments, your servicer is legally mandated to automatically cancel PMI when the principal balance reaches 78% of the original value.
Is a 15-year or 30-year mortgage better for long-term wealth? ▼
A 15-year fixed loan typically carries a 0.50% to 0.75% lower interest rate and amortizes significantly faster, slashing lifetime interest costs by over 55%. However, a 30-year fixed loan lowers required monthly payments by 25% to 30%, providing superior cash flow flexibility during economic downturns.
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