Free Calculators for Your Website
Add any of our calculators to your blog, store or contractor site with a few lines of code. Free, no sign-up, works on phones, and it updates itself when we improve it.
- No ads or analytics in the widget
- Resizes to fit your page
- Light or dark theme
How to add a calculator
- Find the calculator below and click Copy code.
- Paste the code into your page where you want the calculator: a Custom HTML block in WordPress, a Code block in Squarespace, or an Embed HTML element in Wix.
- Publish. The calculator sizes itself to your page and works on phones.
Here is the code for the concrete slab calculator, with a live preview:
For a dark theme, change the first line to <div data-ntm-embed="concrete-slab-calculator" data-theme="dark"></div>.
Concrete Slab Calculator by Nail the Math
The rules
From section 3 of our Terms of Use, in short:
- Embed it free on a lawful website, using our code, changed only through the options we document (such as the theme).
- Keep the credit line and link to Nail the Math visible and unchanged.
- Don't present the calculator as your own, frame it in a misleading way, remove our branding, or place it on a site that is unlawful, deceptive, defamatory, hateful or sexually explicit.
- The calculator comes with the same disclaimers as our site, and you're responsible for how you present it to your visitors.
- Where the law requires, mention the widget in your own privacy notice.
- We may update or stop the widget, and may ask you to remove it.
All calculators you can embed
Concrete
Decks & Stairs
Yard & Lawn
Exterior
Garden
Insulation
Paint & Walls
Flooring & Tile
Measuring
Frequently asked questions
Is it really free?
Yes. There is no sign-up and no fee. We ask only that you keep the credit line and link to Nail the Math, as our Terms of Use require.
Does the widget show ads or track my visitors?
No. The embedded calculator currently loads no advertising and no analytics. Like any embedded content, it is loaded from our servers, which process technical data such as IP addresses to deliver it; our Privacy Policy explains this. If that ever changes, we will say so here and in our Terms first.
Will it slow my page down?
The script is small and loads asynchronously, and the calculator frame loads lazily, as a visitor scrolls near it, so it does not block your page from rendering.
Does it work with WordPress, Squarespace or Wix?
Yes, on any page where you can add custom HTML: a Custom HTML block in WordPress, a Code block in Squarespace, or an Embed HTML element in Wix.
Can I change the colors?
You can switch between a light and a dark theme with data-theme="light" or data-theme="dark". Other changes to the calculator or the credit line are not allowed.
Do I get updates?
Yes. The calculator loads from our site, so every fix and improvement reaches your page automatically.
Questions or a calculator you'd like us to build? Email hello@nailthemath.com.