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How-to: Mortgage calculator (insurance modeled per peril)

A PITI calculator where the insurance line — the one most calculators guess as a flat percentage — is modeled per peril by the same engine your property report uses.

Who this is for: home buyers (and anyone sizing a real monthly payment). Where: Toolkit → Mortgage Payment Calculator, or /tools/mortgage-calculator. It also opens as a drawer inside the buyer Toolkit. Time: ~2 min.


Steps

  1. Open the calculator.
  2. Enter loan inputs: price, down payment, term, rate, property tax, HOA.
  3. Set the insurance basis one of two ways:
  • From a saved property — pick a property and it uses that property's cached,

per-peril risk to model the premium (most accurate).

  • Manual peril toggles — set flood / wind / fire / earthquake severity to

none / moderate / high. (Manual toggles are capped at medium confidence, since they're not a full assessed profile.)

  1. Read the PITI breakdown — principal & interest, taxes, insurance (per-peril),

HOA, and PMI (added automatically when the down payment is under 20%).


Save & load scenarios

Click Save to store a scenario (label, inputs, perils, and the modeled monthly total, optionally linked to a property). Load or delete saved scenarios later to compare options side by side.


Why the insurance line matters

For a high-hazard property (coastal wind, wildfire, flood), the insurance line can be the difference between an affordable and an unaffordable payment. Because CoverGuard models it from real peril data instead of a flat 0.5%-of-price rule of thumb, your PITI is realistic.

The insurance line is a modeled estimate — use it to plan and compare, and confirm the actual premium with a carrier before closing.


Troubleshooting

  • Insurance line seems low/high → check whether you used a saved property (accurate) vs.

manual toggles (capped confidence). Link a property for the best estimate.

  • Can't save a scenario → confirm you're signed in. See

Account & login.


Do this next

Found a payment that works? Look up the property in full, or shortlist homes that fit the budget you just modeled.

Now AI-native

From hazard report to real carrier quotes & pricing

The CoverGuard Advisor reads the risk, finds the carriers writing it, and pulls back live quotes — with every number sourced and auditable.