What this calculator helps you do
Estimate the recurring cost of a fixed-rate home loan and separate principal-and-interest from optional property tax and insurance. The calculation runs entirely in your browser; SENNA Finance does not receive the values entered into this tool.
Worked example
Using the default example—home loan amount of $300,000, annual interest rate of 6.5%, loan term of 30 years, annual property tax of $3,600, monthly insurance of $120—the calculator returns estimated monthly housing cost of $2,316.20; principal and interest: $1,896.20; monthly property tax: $300.00. Change the assumptions to match your own case rather than relying on the example.
Formula and calculation basis
Inputs are converted to the periodic units required by the formula. Results are calculated with full JavaScript numeric precision and rounded only for display.
How to interpret the result
Use the total housing cost for budgeting, but compare the principal-and-interest figure when evaluating loan offers. A lower payment can still produce a higher lifetime cost when the term is longer.
Common mistakes to avoid
- Entering the purchase price instead of the amount borrowed after the down payment.
- Comparing rates without adding taxes, insurance, association fees, or mortgage insurance.
- Assuming the estimate is a lender quote or approval.
Limits and assumptions
The model assumes a fixed nominal annual rate with monthly payments. It does not automatically include closing costs, mortgage insurance, association fees, variable-rate resets, or jurisdiction-specific taxes.
Outputs are estimates, not contractual quotations, regulated disclosures, tax advice, investment advice, or a substitute for professional review.
Frequently asked questions
Does this include property tax and insurance?
Yes, when you enter them. They are added to the principal-and-interest payment to provide a broader monthly housing estimate.
Why is my lender quote different?
A lender may include mortgage insurance, escrow adjustments, fees, points, daily interest, or product-specific rounding that are not entered here.
Can I compare a 15-year and 30-year mortgage?
Yes. Calculate each term and save both scenarios to compare payment and total interest.
Sources and reference context
External references provide educational context and do not imply endorsement of SENNA Finance.