Mortgage Calculator Browser Extension
Calculate mortgage payments with taxes, insurance & PMI. 10+ financial tools, right in your browser toolbar. Free, fast, and 100% private.
Available on Chrome Web Store & Microsoft Edge Add-ons
10 Calculators, Zero Effort
Everything you need for quick financial decisions — accessible with one click from your Chrome toolbar.
Mortgage Calculator
Home loan with tax, insurance & PMI
Loan Calculator
Personal or car loan payments
Compound Interest
Investment growth over time
Auto Loan
Car financing & monthly payments
Student Loan
Education loan payoff planner
Retirement
401k & retirement planning
Debt Payoff
Debt-free timeline calculator
Savings Goal
Reach your savings target faster
ROI Calculator
Return on investment analysis
Tip Calculator
Quick tip & bill splitting
Why Use the Extension?
Lightning Fast
Instant calculations as you type — no page reloads, no waiting.
100% Private
All calculations happen in your browser. No data is ever uploaded or stored.
Dark & Light Mode
Choose your preferred theme. Automatically saved for next time.
Visual Charts
Every calculator includes pie charts and visual breakdowns so you can see the big picture.
One-Click Access
Right from your browser toolbar. No need to search for a website.
Free Forever
All 10 calculators are completely free. No paywalls, no subscriptions.
How to Install
Getting started takes less than 30 seconds:
Add to Your Browser
Click "Add to Chrome" or "Add to Edge" on the store page. The extension installs in seconds.
Pin to Toolbar
Click the puzzle piece icon in your browser, then pin BuildFormulas for one-click access.
Start Calculating
Click the BuildFormulas icon in your toolbar and choose any calculator. That's it!
Extension vs. Website
The extension is designed for quick, on-the-go calculations. The full website offers more depth.
Browser Extension
- ✓ 10 core financial calculators
- ✓ One-click access from toolbar
- ✓ Works completely offline
- ✓ Dark & light mode
- ✓ Instant calculations
- ✗ No educational content
- ✗ Only financial category
BuildFormulas.com
- ✓ 74+ calculators
- ✓ 4 categories (Finance, Construction, Fitness, Business)
- ✓ Detailed explanations & case studies
- ✓ Formula methodology & sources
- ✓ FAQ sections
- ✓ Full amortization schedules
- ✓ Regularly updated content
Frequently Asked Questions
Is the BuildFormulas extension free?
Yes! All 10 calculators are completely free to use. There are no paywalls, no subscriptions, and no hidden fees.
Does it collect my data?
No. BuildFormulas does not collect, store, or transmit any personal data. All calculations are performed locally in your browser. We only store your theme preference (dark/light mode) locally using your browser's built-in storage.
What calculators are included?
The extension includes 10 financial calculators: Mortgage, Loan, Compound Interest, Auto Loan, Student Loan, Retirement, Debt Payoff, Savings Goal, ROI, and Tip Calculator.
Are the calculations accurate?
Yes. The extension uses the same proven formulas as BuildFormulas.com. Every calculator is based on industry-standard formulas and has been thoroughly tested.
Can I use it offline?
Yes! Once installed, the extension works completely offline. All calculations happen in your browser — no internet connection required.
What's the difference between the extension and the website?
The extension provides quick access to 10 core financial calculators right from your toolbar. The website at buildformulas.com offers 74+ calculators across construction, finance, fitness, and business, with more detailed explanations and educational content.
Is it available on Microsoft Edge?
Yes! BuildFormulas is available on both the Chrome Web Store and the Microsoft Edge Add-ons store. The extension works identically on both browsers.
Get 10 Calculators in Your Toolbar
Free forever. No account required. 100% private.