Looking for a free calculator widget to add to your site? Most options out there have catches - view limits, forced branding, monthly fees, or require you to create yet another account.
We built 28 financial calculators that you can embed on any website. No signup. No monthly limits. No “powered by” badge you can’t remove. Just copy two lines of HTML and you’re done.
Why We Made These Free
We sell spreadsheet templates for personal finance. The calculators drive traffic to our site - that’s our business model. We’re not going to limit you to 100 views/month or force you to upgrade to remove branding. If your site gets a million visitors using our mortgage calculator, great.
What’s Available
We’ve got 28 calculators covering the stuff people actually search for:
Mortgage & Home
- Mortgage payment calculator (with taxes, insurance, PMI)
- Home affordability calculator
- Rent vs buy calculator
- Refinance break-even calculator
- Down payment savings calculator
Loans & Debt
- Auto loan calculator
- Loan payment calculator
- Debt payoff calculator (avalanche vs snowball comparison)
- Credit card payoff calculator
- Student loan calculator (with IDR plan comparison)
Retirement & Savings
- 401(k) calculator (with employer match)
- Retirement savings calculator
- FIRE calculator
- Savings goal calculator
- Emergency fund calculator
- College savings / 529 calculator
Income & Tax
- Paycheck calculator (federal + state)
- Income tax estimator
- Salary converter (hourly ↔ monthly ↔ annual)
Investment Tools
- Compound interest calculator
- Investment returns calculator
- Inflation calculator
- Net worth calculator
How to Add a Calculator Widget
Every calculator page has an embed section at the bottom:
Click “Copy Code” and paste into your site. Done.
The embed is just an anchor tag plus a small script. The script transforms the link into the full interactive calculator. If JavaScript fails to load, users still get a working link to the calculator - graceful degradation built in.
Platform-Specific Instructions
WordPress - Add a Custom HTML block, paste the code. No plugin needed.
Squarespace - Insert a Code Block, paste the embed.
Wix - Use the HTML iframe/embed element.
Webflow - Drop it in an Embed component.
Shopify - Works in page content and blog posts.
Ghost - Use the HTML card in the editor.
Static HTML / React / Vue / Next.js - Just paste it in your markup.
No API keys. No configuration files. No WordPress plugin that breaks every update.
Technical Details
Performance - The embed script is minified (~3KB) and loads async. Won’t block your page render or tank your Core Web Vitals.
Privacy - No cookies. No tracking pixels. All calculations happen client-side. Nothing gets sent to our servers. GDPR-friendly.
Responsive - Calculators adapt to their container width. Mobile-friendly out of the box.
Accessible - Proper form labels, keyboard navigation, screen reader support.
Where People Use These
Real estate sites - Mortgage calculator on listings. Home affordability calculator for buyer guides. Rent vs buy for blog posts comparing options.
Finance blogs - Compound interest calculator for “how investing works” posts. Debt payoff calculator for payoff journey content. FIRE calculator for the financial independence community.
Financial advisors - Retirement calculator on services pages. Net worth calculator for wealth management. 401(k) calculator when discussing employer benefits.
HR portals - Paycheck calculator so employees understand their take-home. Salary converter for comparing job offers internally.
Car dealerships - Auto loan calculator on financing pages. Lease vs buy comparison for shoppers on the fence.
Banks & credit unions - Mortgage and savings calculators as member tools. Loan calculators for product pages.
Why Not Build Your Own?
You could. But then you’re maintaining calculator logic, handling edge cases, testing across browsers, making it responsive, ensuring accessibility, and updating it when tax brackets change.
Or you could paste two lines of HTML and move on to things that actually differentiate your site.
vs Other Calculator Widgets
| FinancialAha | Elfsight | Calconic | ConvertCalc | |
|---|---|---|---|---|
| Free views | Unlimited | 200/mo | Limited | 100/mo |
| Signup | No | Yes | Yes | Yes |
| Branding removable | Yes (free) | Paid only | Paid only | Paid only |
| Pre-built finance calcs | 28 | Build your own | Build your own | Build your own |
| Setup time | 30 sec | 5-10 min | 5-10 min | 5-10 min |
Get Started
- Go to our calculator library
- Pick what you need
- Scroll down, copy the embed code
- Paste into your site
30 seconds, tops.
Need a calculator we don’t have? Found something broken? Let us know.