Widgets
Free calculator widgets for your website
Put any of our 101+ calculators on your blog, store or client site in under a minute. Free, responsive, light or dark, and always up to date — no sign-up, no API keys, no JavaScript to write.
Add a widget in three steps
- 1
Pick a calculator
Open any tool — say the mortgage or BMI calculator — and set any starting values you want your visitors to see.
- 2
Click “Get widget”
In the calculator's toolbar, hit Get widget, pick a light, dark or auto theme, and copy the snippet.
- 3
Paste the code
Drop it into an HTML block in WordPress, Squarespace, Wix, Ghost or plain HTML. Done — it just works.
See one live
This is the tip calculator embedded exactly as it would appear on your site:
Prefer it on your desktop? Pop it out
Widgets aren't just for websites. Every calculator can also float as a compact always-on-top window on your desktop (Chrome and Edge) — visible over spreadsheets, documents and other apps while you work.
- 1
Open a calculator
Pick any tool and enter your numbers — say the tip calculator with tonight's bill, or the work-hours calculator with your shift.
- 2
Click “Pop out”
In the calculator's toolbar, hit Pop out. A floating window opens, sized to that calculator, carrying your values.
- 3
Arrange & work
Drag it anywhere — it stays on top of other apps. Pop out more calculators and arrange them like desk accessories.
Example: filling in a timesheet? Pop out the work-hours calculator and keep it floating beside your spreadsheet — enter each shift without ever switching tabs. Splitting a dinner bill over a banking app? The tip calculator hovers right over it.
Floats always-on-top in Chrome and Edge; opens as a small window in other browsers.
Popular widgets
Great fits for blogs and business sites — open one and click Get widget:
- Loan Calculator Monthly payment, total interest, and a full amortization schedule.
- BMI Calculator Body Mass Index from height and weight, metric or imperial.
- Concrete Calculator Cubic yards, pre-mixed bags, and cost for a concrete slab.
- Compound Interest Calculator See how savings grow with compound interest and monthly contributions.
- Mortgage Calculator Estimate your full monthly mortgage payment including principal, interest, taxes and insurance.
- Sleep Calculator Find the best bedtime or wake-up time based on 90-minute sleep cycles.
- Auto Loan Calculator Estimate your monthly car payment with down payment, trade-in, sales tax and APR.
- Number Base Converter Convert numbers between binary, octal, decimal and hexadecimal instantly.
Need something else? Browse all 101+ calculators — every one of them embeds.
Why site owners use our widgets
A real-estate blog embeds the mortgage calculator next to a buying guide; a fitness coach drops the BMI calculator into a nutrition article; a contractor's site adds the concrete calculator to its services page. Interactive tools keep readers engaged — and answered.
- Accurate math, maintained for you. Every formula is backed by a published source (WHO, NASA, U.S. Navy, Mifflin–St Jeor and more) — and when we improve a calculator, your embed updates automatically.
- Keeps visitors on your page. Readers get their answer inside your article instead of bouncing to search for a calculator.
- Fast and lazy-loaded. Served from a global CDN and only loaded when scrolled into view, so your page speed is safe.
- Fits your design. Light, dark or auto theme, responsive width, and values you can pre-set before copying the code.
Widget FAQ
Frequently Asked Questions
Are the calculator widgets really free? +
Yes — every widget is free for personal and commercial websites. All we ask is that the small attribution link under the widget stays in place.
How do I embed a calculator on my website? +
Open any calculator, click Get widget in its toolbar, choose a theme, and copy the code. Paste it into your page's HTML — most site builders (WordPress, Squarespace, Wix, Ghost) accept an HTML/embed block.
Can I customize the widget? +
You can choose a light, dark or auto theme, and the widget carries whatever values you set before copying the code — so a mortgage widget can arrive pre-configured with a sensible local price and rate.
Are the widgets responsive on mobile? +
Yes. The snippet uses width:100% with a sensible max-width, so widgets adapt to the column they are placed in — including phones.
Do the widgets slow my site down? +
No. The iframe is lazy-loaded (loading="lazy"), so it only loads when a visitor scrolls near it, and it is served from a fast global CDN.
Which calculators can I embed? +
All 101+ of them — every calculator and converter on the site has a Get widget button, from mortgage and BMI to Morse code and weight on other planets.
What is the Pop out button? +
It opens the calculator as a small floating window on your desktop — always on top in Chrome and Edge — so it stays visible over spreadsheets, documents or other apps while you work. It keeps your entered values and shows only the calculator.