PITI Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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PITI Calculator is most useful when the result stays tied to the assumptions that produced it. It estimates monthly principal, interest, property tax, and homeowners insurance from the mortgage principal, rate, term, and annual tax and insurance amounts entered.

What this calculator does

PITI Calculator estimates monthly principal, interest, property tax, and homeowners insurance from the mortgage principal, rate, term, and annual tax and insurance amounts entered. The form asks for mortgage principal, annual mortgage rate, mortgage term, annual property tax and annual insurance. The result should therefore be read as a calculation from those displayed assumptions, not as live market, lender, tax, or government-program data unless the page explicitly supplies such a feed.

How to use it

Enter Mortgage principal, Annual mortgage rate, Mortgage term, Annual property tax and Annual insurance. Keep monetary inputs in one currency; the currency selector formats results and does not convert exchange rates. Enter rates and percentages on the scale shown by the field label; do not silently switch between a decimal and a percent. Keep time values in the period shown on the form so a monthly figure is not accidentally entered as an annual one or vice versa. Before calculating, recheck Mortgage principal, Annual mortgage rate, Mortgage term against the source values you intend to model. If a default value is already filled in, confirm that it matches the scenario you actually want to test rather than assuming the preset is current or personally appropriate.

How the calculation works

Monthly principal and interest use the standard mortgage amortization formula. Monthly property tax = annual tax ÷ 12, and monthly insurance = annual insurance ÷ 12. PITI is the sum of those three components. This is the calculation method to use when checking the result from PITI Calculator; values not represented by a visible input should not be inferred as part of the model.

Example

For a $320,000 mortgage at 6.5% for 30 years, the calculator finds monthly principal and interest, then adds $400 per month from $4,800 annual property tax and $125 per month from $1,500 annual insurance.

How to interpret the result

PITI is a broader monthly housing estimate than principal and interest alone. Higher tax or insurance costs raise the total even when the mortgage rate and principal stay unchanged. Compare alternative inputs on the same basis rather than treating one output as a universal cutoff.

Limitations and notes

HOA dues, mortgage insurance, flood insurance, utilities, escrow cushions, changing tax assessments, insurance renewals, and lender servicing adjustments are not included unless separately represented. Any cost, rule, or cash flow without a visible input remains outside the model.