Free Calculator Widgets for Your Website
Put any of our 71 calculators on your own site in about 30 seconds: pick one, copy one line, paste it. No account, no API key, no view limits, no monthly fee — and no cookie banner to update, because the widget tracks nobody. Works on WordPress, Wix, Squarespace, Webflow, Ghost, Shopify, Notion and plain HTML alike.
Recommended: the widget resizes its own height as visitors use it.
Open this widget full-size ↗ · works on any device, no account needed.
How to install, by platform
Every route below is the same two steps: find the block that accepts HTML, paste the line.
- WordPress: add a Custom HTML block where the calculator should appear, paste, publish. No plugin needed.
- Wix: Add → Embed Code → Embed HTML, paste in "Code" mode.
- Squarespace: add a Code block, paste, save.
- Webflow: drag an Embed element into the layout, paste, publish.
- Ghost: insert an HTML card and paste. If your theme strips scripts, use the iframe version.
- Shopify: in a page or blog post, switch the editor to Show HTML and paste.
- Notion / Google Sites: these strip scripts — use the iframe version and paste it as an embed.
- Tilda: block T123 (HTML code), paste the line.
- Blogger, Joomla, Drupal, Framer, Hostinger: any HTML/embed element accepts either version.
- Plain HTML: paste anywhere inside
<body>— the calculator appears exactly at that spot.
The widget did not appear — three causes, in order
- Your platform removed the script. By far the most common: the code looks pasted, the page shows nothing. Notion, Google Sites, some Ghost themes and several CMS plans strip
<script>from user content. Switch to the iframe version above — it needs no JavaScript at all. - A Content-Security-Policy blocks frames. If your site sets a strict CSP, add
frame-src https://calcnotebook.com. Nothing else needs allowing — the widget loads no third-party code. - The line landed in a text field, not an HTML one. Rich-text editors escape the tags and print them as visible text. Look for the block explicitly named HTML, Embed or Code.
What you are actually installing
- 1.3 KB loader, loaded asynchronously — it cannot block your page render.
- Lazy-loaded iframe: the calculator costs nothing until a visitor scrolls to it.
- Auto-height: the widget measures itself and reports its height, so results and tables never get clipped.
- Style isolation: it inherits nothing from your CSS and leaks nothing into it — no broken layouts, no fighting specificity.
- No cookies, no tracking, no ads inside the widget. Your cookie banner and privacy policy stay exactly as they are.
The honest deal
The widgets are free with no traffic limits. In return, the small "Powered by CalcNotebook" line stays visible — that credit is the entire business model, so removing it breaks the deal (and our hearts). Your visitors' inputs are never collected: calculations run in their browser, the same privacy rule as everywhere on CalcNotebook.
Frequently asked questions
Is the calculator widget really free?
Yes — free for any website, personal or commercial, with no traffic limits, no view caps and no account. You never hit a "you have used 1,000 views this month" wall, because there is no meter. The only requirement is keeping the small "Powered by CalcNotebook" line visible.
Do I need to sign up or get an API key?
No. There is nothing to register, no key to paste, no dashboard to log into. Copy the line, paste it into your page, and the calculator is live. We do not know or need to know who embedded what.
The widget did not appear — what now?
Nine times out of ten the platform stripped the <script> tag: Notion, some Ghost themes and several CMS plans remove scripts from user content. Switch to the iframe version above — same calculator, fixed height, no JavaScript required. If the page uses a strict Content-Security-Policy, allow frames from calcnotebook.com.
Will the widget slow my site down?
The loader is 1.3 KB and runs asynchronously; the calculator itself lives in a lazy-loaded iframe, so it costs nothing until it scrolls into view. Your Core Web Vitals are unaffected — the widget cannot block your page render.
Do I have to update my cookie banner or privacy policy?
No, and this is the part most widget providers cannot say: our embed sets no cookies, runs no advertising or tracking scripts, and never reads anything from your page. Everything a visitor types is calculated inside their own browser and never reaches us. Nothing to disclose, nothing to consent to.
Does it fit my design and work on mobile?
The widget takes the full width of its container and reports its own height as content changes, so it fits blog posts, narrow sidebars and mobile layouts without configuration. It inherits nothing from your CSS and leaks nothing into it.
Will the embed code keep working?
The embed address is a permanent commitment — a widget installed today keeps working, and improvements to the calculator reach your page automatically because it loads from us on every view. You never touch the code again.
Can I remove the "Powered by CalcNotebook" credit?
The credit line is the entire price of the widget — please keep it. It is one small line under the calculator, and it is what pays for the tools being free and unlimited.
Can I embed more than one calculator on a page?
Yes, as many as you like, on as many pages as you like. Each one resizes independently; the height listener is registered once no matter how many widgets share the page.
All 71 embeddable calculators
Each link opens the builder with that calculator selected and its code ready to copy.
Math
Percentage Calculator · Unit Converter · Random Number Generator · Dice Roller · Fraction Calculator
Dates & time
Age Calculator · Date Calculator · Time Zone Converter · Hours Calculator · Countdown Timer · Chess Clock · Online Timer · Deadline Pace · Notice Period
Finance
Mortgage Calculator · Debt-to-Income Ratio Calculator · Debt Payoff Calculator · Amortization Calculator · Loan Calculator · Tip Calculator · Subscription Cost Calculator · Retirement Calculator · CD Calculator · Compound Interest Calculator · Discount Calculator · Auto Loan Calculator · Time Card Calculator · Salary Calculator · Savings Goal Calculator · Margin Calculator · Break-Even Calculator · VAT Calculator · SIP Calculator · EMI Calculator · PPF Calculator · PMI Calculator · Rule of 72 · Meeting Cost · Split by Income · Down Payment · Savings Pace · Prorated Rent · FD Calculator · Lumpsum Calculator · Freelance Rate · Break-Even Customers · Moving Budget
Health
BMI Calculator · Calorie Deficit Calculator · TDEE Calculator · Macro Calculator · Sleep Calculator · Body Fat Calculator
School & study
GPA Calculator · Final Grade Calculator · Pomodoro Timer · Weighted Grade Calculator · Test Grade Calculator · Cumulative GPA Calculator · Grade Curve Calculator · Percentage to GPA · Attendance Calculator · Random Team Generator · Study Planner
text
Word Counter · QR Code Generator · Case Converter · Words to Time · Password Generator
Travel
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Always up to date — automatically
The widget on your site loads from our servers on every page view, so improvements and fixes reach every embedded calculator automatically — you never need to touch the code again. And the embed address itself is a permanent commitment: a widget you install today will keep working years from now.