Calculateur de Mortgage Payment
Estimate monthly mortgage principal and interest payments.
Formula and method
This calculator computes Monthly payment (P&I), Total interest paid directly in your browser without sending data to an external server.
Mathematical formula
- Monthly payment (P&I):
(rate===0) ? (principal ÷ (years × 12)) : (principal × (rate ÷ 1200)) ÷ (1-1+(rate ÷ 1200)^(-(years × 12))) - Total interest paid:
(((rate===0) ? (principal ÷ (years × 12)) : (principal × (rate ÷ 1200)) ÷ (1-1+(rate ÷ 1200)^(-(years × 12)))) × years × 12) - principal
Variables and parameters
- Loan amount (principal): default value 350000.
- Annual interest rate (rate): default value 6.5 %.
- Loan term (years): default value 30 years.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does Mortgage Payment Calculator use?
Mortgage Payment Calculator evaluates outputs such as <strong>Monthly payment (P&I), Total interest paid</strong> based on inputs including Loan amount, Annual interest rate, Loan term. Check the Mathematical Method section for the explicit formula.
How can I compare different financial scenarios using Mortgage Payment Calculator?
You can click the "Add to Compare" button after computing your scenario to pin it to your temporary side-by-side Compare Workbench, allowing you to evaluate loan, rate, or interest differences.
What happens if I enter invalid or zero values into Mortgage Payment Calculator?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in Mortgage Payment Calculator saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is Mortgage Payment Calculator free to use?
Yes. Mortgage Payment Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Mortgage Payment Calculator store or upload my data?
No. Mortgage Payment Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Mortgage Payment Calculator?
Mortgage Payment Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Mortgage Payment Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Mortgage Payment Calculator to your own blog post or page.