Mortgage Rate Comparison Tool
Compare two mortgage rates side by side.
All calculations happen locally in your browser — nothing is uploaded, stored or tracked.
Enter the loan amount and term
Same for both options.
Enter the two rates
The quotes you are comparing.
Read the difference
Monthly, lifetime and total savings.
What Is a Rate Comparison Tool?
A fraction of a percentage point on a mortgage is worth thousands of dollars over 30 years. This tool compares two rates on the same loan amount and term, showing the monthly difference, the lifetime interest difference and the total savings.
All figures come from the amortization formula with your inputs — the tool makes the trade-off visible so you can judge whether a lower rate justifies its costs (points, fees).
The Method
Each rate is amortised independently over the same term; the tool reports the per-month and lifetime differences.
Your data never leaves your device.
Every calculation on this site runs in your browser using vanilla JavaScript. Nothing is uploaded, stored or tracked.
- 100% local, client-side calculations
- No data stored on any server
- No tracking, no analytics, no ads scripts
- Works offline once loaded
Frequently Asked Questions
How much does 0.5% save on a mortgage?
On a $300k, 30-year loan, a 0.5% rate cut saves roughly $90–100 per month and $30,000+ in interest over the term.
Should I pay points for a lower rate?
Compare the upfront cost with the monthly savings — the break-even point tells you when the lower rate pays for itself.
Is the difference the same every year?
No — the interest portion falls over time, but the monthly payment difference stays constant for fixed-rate loans.
Does this include fees?
No — it compares pure rates. Add fees to see the true cost of each option.
What if the terms differ?
The tool compares equal terms. For different terms, compare the total costs instead.