Free Embeddable Calculators
Add any of our 20 most popular calculators to your website with a single line of code. Each embed is responsive, ad-free, mobile-friendly, and includes a small attribution link back to CalcNest AI.
All embeds are free for personal and commercial use. The only requirement is keeping the "Powered by CalcNest AI" attribution visible — the same approach used by Calculator.net and other major calculator libraries.
How to embed
Copy the iframe snippet from any calculator below and paste it into your website's HTML where you want the calculator to appear. Works on WordPress, Wix, Squarespace, Webflow, Ghost, Substack, and any standard HTML site.
<iframe src="https://calcnestai.com/embed/[calculator-slug].html" width="100%" height="700" frameborder="0" style="border: 1px solid #e5e5e5; border-radius: 12px; max-width: 720px;" loading="lazy" title="Calculator by CalcNest AI"></iframe>
Replace [calculator-slug] with the slug of any calculator listed below.
Available calculators
Mortgage Calculator
Monthly payment + lifetime interest on home loans
EMI Calculator
Equated monthly installments for loans
Compound Interest
Future value with regular contributions
FIRE Number
Target portfolio for financial independence
Retirement Calculator
Monthly savings needed for retirement goal
401k Calculator
401k growth with employer match
SIP Calculator
Systematic investment plan returns
ROI Calculator
Return on investment percentage
Debt Payoff
Time and interest to debt-free
Savings Goal
Monthly amount to hit a savings target
Credit Card Payoff
Time to clear card balance with interest
BMI Calculator
Body Mass Index with category
Calorie Calculator
Daily calorie needs for goals
BMR Calculator
Basal metabolic rate via Mifflin-St Jeor
TDEE Calculator
Total daily energy expenditure
Macro Calculator
Protein/fat/carb daily targets
Percentage Calculator
All forms of percent calculations
Age Calculator
Exact age in years, months, days
Dog Food Portion
Daily food portion for any dog
ChatGPT Token Counter
Estimate tokens for any prompt
FAQ
Can I customize the embedded calculator's colors?
The embeds inherit our default theme. Custom styling isn't currently supported, but the embed automatically switches to dark mode when the user's system prefers dark, so most sites work well without customization.
Do I need an account or API key?
No. Embeds are free, no signup required, no rate limits. Paste the iframe code and you're done.
Will the embedded calculator load fast?
Yes — embeds use loading="lazy" so they only load when scrolled into view. The embed page itself is ~5KB plus shared CSS/JS, which is cached after first load.
Can I use this on commercial sites?
Yes, both personal and commercial use are free. The only requirement is keeping the "Powered by CalcNest AI" attribution link visible at the bottom of the embed.
Can I request a calculator that isn't on this list?
Yes. Email hello.goledigitalstudio@gmail.com with which calculator you want to embed and we'll add it to the embed library if there's general demand. We have 456 calculators total — many can be made embed-ready.
Will the calculator update automatically when you improve it?
Yes — embeds reference our live page, so any improvements (bug fixes, additional features, better formulas) automatically propagate to your site without you doing anything.