PITI Calculator
Add principal, interest, taxes, insurance, HOA and PMI into one monthly PITI figure, then check it against front-end and back-end debt-to-income limits.
Payment breakdown
| Component | Monthly | Annual | Share of PITI |
|---|---|---|---|
| Principal & interest | $1,991.01 | $23,892 | 78.4% |
| Property tax | $350.00 | $4,200 | 13.8% |
| Homeowners insurance | $125.00 | $1,500 | 4.9% |
| HOA dues | $0.00 | $0 | 0.0% |
| PMI | $73.50 | $882 | 2.9% |
| Total PITI | $2,539.51 | $30,474 | 100.0% |
Affordability check
Housing ratio 31.7% against your 28% limit — the most PITI that fits is $2,240.00 a month.
Total debt ratio 39.2% against your 36% limit — after your other debts that leaves $2,280.00 for housing.
This payment is about $299.51 above the tighter of the two limits.
The 28/36 guideline is a common US underwriting rule of thumb, not a law — many loan programs allow higher ratios and other countries use different tests, so both limits are editable. PMI is applied only while the loan-to-value ratio is above 80%. Estimates only, not financial advice.
What is the PITI Calculator?
The ByteTools PITI Calculator builds the payment a lender actually cares about. Principal and interest come from the standard annuity formula, then property tax, homeowners insurance, HOA dues and PMI are added on top to give the full monthly housing cost — the number that goes into an underwriting decision, not just the loan payment.
- Full PITI from principal, interest, tax, insurance, HOA and PMI
- Itemised table with monthly, annual and share-of-payment columns
- Front-end housing ratio and back-end DTI against editable limits
- Back-solves the maximum PITI each limit allows
- PMI applied automatically only above 80% loan-to-value
- Private in-browser math; estimates only, not advice
How to use the PITI Calculator
- 1
Enter the home price, down payment, interest rate and loan term.
- 2
Add your annual property tax, annual homeowners insurance and any monthly HOA dues.
- 3
Set the annual PMI rate — it is applied automatically only while loan-to-value is above 80%.
- 4
Enter your gross monthly income and other monthly debt payments.
- 5
Adjust the front-end and back-end limits if your lender uses different ones, then read the ratios and headroom.
About the PITI Calculator
The ByteTools PITI Calculator builds the payment a lender actually cares about. Principal and interest come from the standard annuity formula, then property tax, homeowners insurance, HOA dues and PMI are added on top to give the full monthly housing cost — the number that goes into an underwriting decision, not just the loan payment.
From there it back-solves the two ratios lenders use: the front-end housing ratio, which is PITI divided by gross monthly income, and the back-end debt-to-income ratio, which adds your other monthly debt payments. Both limits default to the familiar 28/36 guideline but are fully editable, because many loan programs allow more and other countries use different tests entirely.
You get an itemised breakdown showing what share of the payment each component takes, plus how much monthly headroom you have under the tighter of the two limits. Everything is computed in your browser and nothing is uploaded. Estimates only, not financial advice.
Frequently asked questions
What does PITI stand for?
Principal, Interest, Taxes and Insurance — the four parts of a typical escrowed mortgage payment. HOA dues and mortgage insurance are usually counted alongside them when a lender assesses affordability, which is why this calculator includes both.
What is the 28/36 rule?
It is a long-standing guideline that your housing payment should stay under 28% of gross monthly income and your total debt payments under 36%. It is a convention rather than a law — many programs approve higher ratios — so both numbers are editable inputs here.
Is PITI the same as my mortgage payment?
Not quite. Your principal and interest is the loan payment; PITI is what you actually send each month when taxes and insurance are escrowed. That difference can easily be several hundred a month, which is why budgeting on P&I alone catches people out.
How do I lower my PITI?
A larger down payment cuts principal and interest and can remove PMI entirely once you are under 80% loan-to-value. A longer term lowers the payment but raises lifetime interest. Shopping homeowners insurance and appealing a property tax assessment are the two lines people most often forget.
What debts count toward the back-end ratio?
Generally recurring monthly obligations that show on your credit report — car loans, student loans, minimum credit card payments, personal loans and child support. Utilities, groceries and insurance premiums normally do not. Enter the total of those recurring payments in the other debts field.
Related tools
Mortgage Calculator
Estimate your monthly mortgage payment including principal, interest, property tax and insurance. See total interest over the life of the home loan.
Debt-to-Income Ratio Calculator
Calculate your front-end and back-end debt-to-income ratios from itemised monthly debts and gross income, with the lender thresholds each result falls into.
PMI Calculator
Estimate monthly private mortgage insurance, find the month your balance crosses 80% and 78% loan-to-value, and total the PMI you pay before it drops off.
Home Affordability Calculator
Find out how much house you can afford from your income, monthly debts and down payment, using the 28/36 debt-to-income rule with fully editable ratios.
Closing Cost Calculator
Build an itemised closing cost estimate: origination, prepaid interest, escrow months and your own fee lines, totalled into the cash you need at closing.