Mortgage Calculator – Addition.site

Your quick, free, and accurate tool for estimating every component of your monthly home‑loan payment.

Enter Your Loan Details
Loan amount ($) – the total price of the property you’re buying.
Interest rate (%) – the annual percentage rate (APR) offered by your lender.
Loan term (years) – the length of the mortgage (commonly 15, 20, or 30 years).
Down payment ($) – the upfront cash you’ll pay at closing.
Property taxes ($/year) – annual taxes on the property.
Insurance ($/year) – annual homeowner’s insurance premium.
Click “Calculate”
The script uses the standard amortization formula to compute:
Monthly principal & interest payment
Monthly taxes & insurance
Total monthly payment (displayed in the read‑only result field)
View the Results
Result field – shows the total monthly cost. Click it to copy the amount to your clipboard.
Amortization table – a table of the first 12 months, showing payment, principal, interest, and remaining balance.
Bar chart – a visual comparison of principal vs. interest paid each month (first 12 months).
Share on X – a button that lets you post your result on Twitter/X directly from the page.
Adjust & Re‑calculate
Change any input value and hit “Calculate” again to see how your monthly payment shifts.

Term	What It Means	Why It Matters
Loan amount	The amount you borrow after subtracting the down payment.	Determines the principal on which interest is calculated.
Interest rate	Annual percentage rate (APR) expressed as a decimal.	Drives the cost of borrowing; higher rates mean higher payments.
Loan term	Length of the mortgage in years.	Longer terms lower monthly payments but increase total interest paid.
Down payment	Up‑front cash paid at closing.	Reduces the principal and can eliminate private mortgage insurance (PMI).
Property taxes	Annual taxes levied by local governments.	Typically added to the monthly payment to avoid escrow penalties.
Insurance	Annual homeowner’s insurance premium.	Protects your investment; also added to the monthly payment.
Principal	Portion of each payment that reduces the loan balance.	Increases over time as the loan amortizes.
Interest	Portion of each payment that pays the lender for the loan.	Decreases over time as the principal shrinks.
Amortization	The gradual reduction of a loan balance through scheduled payments.	Helps you see how much you’ll owe each month and when the loan will be paid off.

Scenario	Why Use the Calculator
First‑time home buyer	Estimate how much you can afford and how different down‑payment amounts affect monthly costs.
Refinancing decision	Compare current mortgage terms with a potential new loan to see if refinancing saves money.
Budget planning	Integrate the monthly payment into your budget to ensure you can comfortably cover housing costs.
Investment analysis	Calculate the cost of a mortgage to evaluate rental property returns or flip projects.
Financial education	Understand how interest, principal, taxes, and insurance contribute to your total payment.

Instant, accurate calculations using the industry‑standard amortization formula.
All‑in‑one view: payment breakdown, amortization table, and visual chart.
No sign‑up or data collection – privacy‑first, ad‑supported.
Shareable results: Post your estimate on X with one click.
Copy‑to‑clipboard for quick use in spreadsheets or emails.
Disclaimer: “This calculator is for general information only and does not account for your personal financial situation. Seek independent financial advice before making decisions.”

mortgage calculator

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