mortgage (PITI) Calculator

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PITI

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Table of Contents

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What is PITI Calculator?

PITI stands for principal, interest, taxes and insurance, four common parts of a monthly housing payment. This calculator estimates principal and interest for a fixed-rate mortgage, then adds the monthly tax and insurance amounts entered. It can help create an early housing budget or compare the effect of different loan terms.

The result is an estimate rather than a lender quote. Mortgage insurance, association dues, changing escrow amounts, fees and other housing costs may be additional. Use the written Loan Estimate and later servicing statements for the amounts that govern an actual mortgage.

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How to Use This Calculator

  1. Enter the loan principal and select its currency.
  2. Enter the term in years and the annual interest rate as a percentage.
  3. Enter monthly property tax and monthly homeowners-insurance amounts. Select the same currency for all three money fields.
  4. Select Calculate to see the estimated monthly PITI.

The page converts years to months and the annual interest percentage to a monthly decimal rate. It applies the standard fixed-payment formula. When the rate is zero, it divides principal evenly over the term. The entered tax and insurance amounts are then added directly.

If you have annual tax or insurance figures, divide each by twelve before entry. The form does not perform that annual-to-monthly conversion.

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Formula Used

Monthly principal and interest M = P × i(1 + i)ⁿ / ((1 + i)ⁿ − 1), where i = annual rate / 100 / 12 and n = term years × 12. Estimated PITI = M + monthly property tax + monthly insurance. At zero interest, M = P / n.
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Variables Explained

InputMeaningEntry basis
Principal (P)Mortgage balance being amortizedPositive currency amount
TermTime allowed for scheduled repaymentYears
Interest rateAnnual fixed rate used for the estimatePercentage per year
TaxProperty-tax share assigned to one monthMonthly amount
InsuranceHomeowners-insurance share assigned to one monthMonthly amount

The menu labels currency but does not exchange one currency for another. Mixed currency selections are rejected because adding unlike monetary units would not be meaningful.

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Worked Example

Consider a USD 300,000 principal, a 30-year term and a 6.5 percent annual rate. The monthly rate is 0.065 ÷ 12 and the term contains 360 payments. The fixed principal-and-interest formula gives about USD 1,896.20 per month.

If monthly property tax is USD 400 and monthly homeowners insurance is USD 150, estimated PITI is 1,896.20 + 400 + 150 = USD 2,446.20. If the source figures were annual amounts of USD 4,800 and USD 1,800, dividing them by twelve would produce those monthly inputs.

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Why Use This Calculator?

The result combines the four amounts supplied, which makes it more useful for budgeting than principal and interest alone. It still may be below the total amount due. Private mortgage insurance, flood insurance, association charges and other assessments are absent unless one of the entered fields deliberately includes them.

Principal and interest may remain level on a fixed-rate fully amortizing loan, but taxes and insurance can change. Escrow shortages can also alter a servicer’s collected amount. Revisit the estimate when tax bills, premiums or the loan terms change.

Use current local tax and insurance information where possible. A percentage of purchase price may be adequate for an early scenario, but a billed monthly equivalent gives a clearer budget. Keep the date and source of each assumption so the estimate can be updated later.

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Common Mistakes

    Do not enter annual tax or insurance totals as though they were monthly; doing so multiplies their monthly effect by twelve. Avoid using the home purchase price when the financed principal is lower after a down payment. Make sure all money fields use the same currency.

    This page assumes a fixed rate and equal monthly repayment. It does not model adjustable rates, interest-only periods, balloon payments or extra principal. It also does not decide whether taxes and insurance are actually paid through escrow; it simply combines monthly estimates for planning.

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Frequently Asked Questions

Are tax and insurance entered monthly or annually?

Enter monthly amounts. Divide an annual bill or premium by twelve before using the form, while allowing for any known billing differences.

Does PITI include mortgage insurance?

Not in a separate field here. The insurance input is described as homeowners insurance, so account for mortgage insurance separately when it applies.

Does this include homeowners association dues?

No. Association dues can be an important housing expense but are outside the four values used by this page.

Why can my escrow payment change?

Property taxes and insurance premiums can rise or fall, and an escrow analysis may identify a shortage or surplus. Those changes affect the collected total.

Can I use this for an adjustable-rate mortgage?

The estimate uses one rate for the full term. It does not model future rate adjustments, caps or changing principal-and-interest payments.

What principal should I enter?

Use the amount financed by the mortgage, not automatically the purchase price. A down payment usually makes those numbers different.

Is the PITI estimate my complete housing budget?

No. Maintenance, utilities, association dues and other ownership costs can sit outside the mortgage payment. Include them in a broader affordability review.

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Sources & References

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