Free Embeddable Widgets
Free Calculators for Your Website
Put a free, NEC-accurate HVAC or electrical calculator on your own site in one line of code. No login, no API key, no plugin. It stays accurate automatically and works on any site.
Pick a Calculator or Chart to Embed
Conduit Bending Calculator
Grab the one-line embed code and drop it into your site, free.
Superheat & Subcooling Calculator
Grab the one-line embed code and drop it into your site, free.
Voltage Drop Calculator
Grab the one-line embed code and drop it into your site, free.
Wire Size Calculator
Grab the one-line embed code and drop it into your site, free.
EV Charger Calculator
Grab the one-line embed code and drop it into your site, free.
Box Fill Calculator
Grab the one-line embed code and drop it into your site, free.
Conduit Fill Calculator
Grab the one-line embed code and drop it into your site, free.
BTU Load Calculator
Grab the one-line embed code and drop it into your site, free.
Wire Ampacity Chart (NEC 310.16)
Grab the one-line embed code and drop it into your site, free.
Conduit Fill Chart (EMT, 40%)
Grab the one-line embed code and drop it into your site, free.
Box Fill Volume Chart (NEC 314.16)
Grab the one-line embed code and drop it into your site, free.
Ground Wire Size Chart (NEC 250.122)
Grab the one-line embed code and drop it into your site, free.
Standard Breaker Sizes (NEC 240.6)
Grab the one-line embed code and drop it into your site, free.
Ampacity Derating Factors (NEC 310.15)
Grab the one-line embed code and drop it into your site, free.
BTU per Square Foot Chart
Grab the one-line embed code and drop it into your site, free.
A2L Refrigerant Properties
Grab the one-line embed code and drop it into your site, free.
R-454B vs R-410A Chart
Grab the one-line embed code and drop it into your site, free.
How It Works
- Open the calculator you want and find the “Embed the calculator on your site” section.
- Copy the one-line snippet.
- Paste it into any page, post, or CMS. Done. It stays accurate on its own.
Why Embed an Intry Calculator
Free, no login
No account, no API key, no usage cap. Keep the small credit line and it is yours.
Always accurate
Computed from the published NEC tables and manufacturer data, and it updates itself.
Works anywhere
A standard iframe that never fights your site’s styling. WordPress, Squarespace, Webflow, Wix, or raw HTML.
Frequently Asked Questions
How do I add a calculator to my website?
Open the calculator you want, find the "Embed the calculator on your site" section, and copy the one-line snippet. Paste it into any page, post, or CMS (WordPress, Squarespace, Webflow, Wix, or raw HTML) where you want the calculator to appear. It loads in an iframe, so it never conflicts with your site's styles, and it stays accurate automatically.
Is it really free?
Yes. Every calculator embed is free, with no login, no API key, and no usage limit. Keep the small "Powered by Intry" credit line that ships with the snippet and you are good to go.
Does it work on WordPress, Squarespace, and Wix?
Yes. The snippet is a standard iframe plus a credit line, so it works anywhere you can paste HTML: a WordPress Custom HTML block, a Squarespace code block, a Webflow embed, a Wix HTML iframe, or a plain web page. No plugin required.
Will the calculator slow down my page?
No. Each calculator is a small, self-contained widget that loads on its own with lazy loading, so it does not block your page from rendering. There is nothing to install and no external script to maintain.
Are the calculations accurate and up to date?
Yes. Every result is computed from the published NEC tables and manufacturer data, and the embedded version always shows the current version, so you never have to update anything. Each calculator cites the NEC section or data source it uses.