Put a working calculator widget on your website for free
Any of our 300+ embeddable calculators can live on your site with one copy-paste snippet: ad-free on your page, mobile-responsive, dark-mode aware, and kept current by us. No account, no API key, no JavaScript conflicts, no cost. It is free content for your website that answers a question your visitors already have, and it keeps working because we maintain it.
How to embed a calculator widget
- Pick a calculator. Browse our full collection: grades, finance, health, DIY materials, and more.
- Click "</> Add to your website." Every calculator page has the button, right under the tool.
- Paste the snippet anywhere in your page's HTML. That's it. The calculator renders inside your page, styled, mobile-responsive, and always up to date.
The snippet, exactly
Here is the complete calculator embed code for our Tip Calculator, character for character what the button gives you. Two lines of plain HTML, nothing to configure, and the height and max-width are yours to edit:
<iframe src="https://calcaholic.com/embed/tip-calculator/" style="width:100%;max-width:520px;height:520px;border:1px solid #e3e8f0;border-radius:12px;" title="Tip Calculator" loading="lazy"></iframe>
<p style="font-size:13px;">Calculator powered by <a href="https://calcaholic.com/tip-calculator/">Tip Calculator</a> on Calcaholic</p>See it live
This is that same snippet, pasted on this page:
Why embed ours instead of building one
- Ad-free on your site, permanently. A calculator embed from us carries no advertising, no lead capture, and no links to anyone's competitors. We keep ads on our own pages; your visitor stays your visitor.
- Every answer is tested before it ships. Each calculator is verified by execution against primary sources, with tens of thousands of automated checks across the site. How we verify is public.
- The data stays current without you touching anything. When the IRS moves a mileage rate, tax brackets change, or the USDA revises a chart, we refresh the calculator at the source and your embed updates automatically. A calculator you build yourself is current on the day you build it.
- It cannot break your page. The iframe is sandboxed from your scripts and styles and lazy-loads, so it costs nothing until a visitor scrolls to it.
- It improves over time. When a calculator gains a feature or a clearer explanation, your embed gets it the same day, free.
Who embeds our calculators
Free embeddable calculators for websites of every kind. A calculator widget for your website earns its place when it answers the question your visitors arrived with, and these are the pairings that work:
- Real estate agents & lenders: the mortgage, VA loan, and property tax calculators keep visitors on your listing pages.
- Teachers & school sites: the final grade and GPA calculators are the tools your students are Googling anyway.
- Fitness coaches & health blogs: TDEE, BMI, and macro calculators turn articles into tools.
- Contractors & garden centers: concrete, mulch, and paint calculators answer the question every customer calls to ask.
- Electricians & HVAC: voltage drop, BTU sizing, and watts to amps, each with the code context and safety notes already written.
- Rental & service companies: the question your customers phone you about, answered on your own page. Dumpster size (which prices the weight limit, not just the volume), storage unit size, moving truck size, portable toilets, tent size, and generator size. See all of them in How Many Do I Need?
- Caterers, bakers & event planners: how much meat (with the cooked-yield arithmetic most guides skip), cake servings, and how much to stock the bar.
- Financial advisors: compound interest and retirement calculators, with the disclaimers already built in.
Looking for sizing calculators?
If it is a size chart or a fit question rather than a number question, check out our sister site Sizeaholic, where 50 sizing calculators and size charts, shoe sizes by brand, rings, bras, bikes, snowboards, TVs, tires, even dog collars, are just as easy to embed on your website as additional free content for your users: the same one-snippet setup, the same free price, and the same ad-free promise on your pages.
Need one we don't have?
We build custom calculators as a plain-priced service: sponsored or exclusive, sourced and tested to the same standard as everything here, hosted by us, embedded by you. The details and prices are on Custom Calculators.
The fine print (it's short)
The snippet includes a small "Powered by Calcaholic" attribution link. Please keep it; it's how a free tool stays free. The calculators are provided as-is under our disclaimer, and embedding is governed by the short, human-readable license in our Terms of Use. We may update a calculator's design or content over time (that's a feature: your embed gets the improvements automatically). No signup, no tracking of your visitors beyond the same anonymous analytics our own site uses.
Frequently asked questions
Does it really cost nothing?
Nothing. No trial, no tier, no credit card. The small attribution link under the calculator is the entire price.
Do the embedded calculators show ads?
No, and this is a promise, not a temporary state: embedded calculators are ad-free, with no lead capture and no links to anyone's competitors. We keep advertising on our own site, not yours.
Will it slow down my site?
No. The calculator loads inside an iframe with loading="lazy", so it doesn't load until a visitor scrolls to it, and it can't block or conflict with your page's own scripts or styles.
Does it work on WordPress, Squarespace, Wix, or Shopify?
Yes. The snippet is plain HTML, so it works on any platform with an HTML or embed block: a Custom HTML block in WordPress, a Code Block in Squarespace, the Embed HTML element in Wix, or a Custom Liquid or HTML section in Shopify.
Will the numbers stay current?
Yes, and that is the quiet advantage of embedding instead of copying: when the IRS changes a mileage rate, tax brackets move, or the USDA updates a chart, we refresh the calculator against the primary source and your embed carries the new figures automatically, with no work on your end.
Can I resize the calculator widget, or embed more than one?
Both. The snippet's width is fluid (100% up to a max), the height and max-width are yours to edit in the style attribute, and you can embed as many calculators as your pages need.
Can you build a custom calculator for my business?
Yes, that's a real service with plain pricing: see Custom Calculators for the sponsored and exclusive tiers. The weirder the calculator, the more we like it.