Free Embeddable Calculator Widgets
Add a professional health calculator to your website in under a minute. These are the same calculators running on CalorieJoy - BMI, daily calories, TDEE, macros, body fat, and more - packaged as free embeddable widgets.
- No signup, no approval process, no domain locking - copy, paste, done
- Automatic dark mode - the widget matches your visitors' theme
- Responsive and auto-resizing - fits any layout, no scrollbars
- US and metric units built in
- Free forever - just keep the small credit link
Perfect for trainers, nutrition coaches, health bloggers, gyms, and wellness sites.
Free BMI Calculator Widget for Your Website
Let your visitors check their Body Mass Index without leaving your site. Instant BMI with category and healthy weight range, in US or metric units.
<iframe src="https://caloriejoy.com/embed/calculator/bmi" id="cj-widget-bmi" title="BMI Calculator" style="width:100%;max-width:640px;border:0;height:620px" loading="lazy"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("cj-widget-bmi");if(f&&e.source===f.contentWindow&&e.data&&e.data.cjEmbedHeight){f.style.height=e.data.cjEmbedHeight+"px"}});</script>
<p style="font-size:12px;margin:4px 0 0">Free <a href="https://caloriejoy.com/calculator/bmi" target="_blank">bmi calculator</a> by CalorieJoy</p> Free Daily Calorie Calculator Widget for Your Website
The most requested widget for fitness and coaching sites: visitors get their daily calorie target for losing, maintaining, or gaining weight, based on age, gender, and activity.
<iframe src="https://caloriejoy.com/embed/calculator/daily-calories-intake" id="cj-widget-dci" title="Daily Calorie Calculator" style="width:100%;max-width:640px;border:0;height:700px" loading="lazy"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("cj-widget-dci");if(f&&e.source===f.contentWindow&&e.data&&e.data.cjEmbedHeight){f.style.height=e.data.cjEmbedHeight+"px"}});</script>
<p style="font-size:12px;margin:4px 0 0">Free <a href="https://caloriejoy.com/calculator/daily-calories-intake" target="_blank">daily calorie calculator</a> by CalorieJoy</p> Free TDEE Calculator Widget for Your Website
Total Daily Energy Expenditure - the number every training plan starts from. Calculates maintenance calories from BMR and activity level.
<iframe src="https://caloriejoy.com/embed/calculator/tdee" id="cj-widget-tdee" title="TDEE Calculator" style="width:100%;max-width:640px;border:0;height:700px" loading="lazy"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("cj-widget-tdee");if(f&&e.source===f.contentWindow&&e.data&&e.data.cjEmbedHeight){f.style.height=e.data.cjEmbedHeight+"px"}});</script>
<p style="font-size:12px;margin:4px 0 0">Free <a href="https://caloriejoy.com/calculator/tdee" target="_blank">tdee calculator</a> by CalorieJoy</p> Free Macro Calculator Widget for Your Website
Daily protein, carb, and fat targets. Includes the CalorieJoy smart split based on body weight and activity - not just fixed percentages.
<iframe src="https://caloriejoy.com/embed/calculator/macro" id="cj-widget-macro" title="Macro Calculator" style="width:100%;max-width:640px;border:0;height:760px" loading="lazy"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("cj-widget-macro");if(f&&e.source===f.contentWindow&&e.data&&e.data.cjEmbedHeight){f.style.height=e.data.cjEmbedHeight+"px"}});</script>
<p style="font-size:12px;margin:4px 0 0">Free <a href="https://caloriejoy.com/calculator/macro" target="_blank">macro calculator</a> by CalorieJoy</p> Free BMR Calculator Widget for Your Website
Basal Metabolic Rate via the Harris-Benedict equation - how many calories the body burns at rest. A clean fit for science-minded fitness content.
<iframe src="https://caloriejoy.com/embed/calculator/bmr" id="cj-widget-bmr" title="BMR Calculator" style="width:100%;max-width:640px;border:0;height:640px" loading="lazy"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("cj-widget-bmr");if(f&&e.source===f.contentWindow&&e.data&&e.data.cjEmbedHeight){f.style.height=e.data.cjEmbedHeight+"px"}});</script>
<p style="font-size:12px;margin:4px 0 0">Free <a href="https://caloriejoy.com/calculator/bmr" target="_blank">bmr calculator</a> by CalorieJoy</p> Free Body Fat Percentage Calculator Widget for Your Website
Body fat estimate using the US Navy tape method - no calipers or scales needed, just a few measurements.
<iframe src="https://caloriejoy.com/embed/calculator/body-fat-percentage" id="cj-widget-body-fat" title="Body Fat Percentage Calculator" style="width:100%;max-width:640px;border:0;height:760px" loading="lazy"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("cj-widget-body-fat");if(f&&e.source===f.contentWindow&&e.data&&e.data.cjEmbedHeight){f.style.height=e.data.cjEmbedHeight+"px"}});</script>
<p style="font-size:12px;margin:4px 0 0">Free <a href="https://caloriejoy.com/calculator/body-fat-percentage" target="_blank">body fat percentage calculator</a> by CalorieJoy</p> Free Water Intake Calculator Widget for Your Website
Daily hydration target based on weight, activity, and climate, in liters, ounces, and glasses. Almost no other site offers this as a widget.
<iframe src="https://caloriejoy.com/embed/calculator/water-intake" id="cj-widget-water-intake" title="Water Intake Calculator" style="width:100%;max-width:640px;border:0;height:640px" loading="lazy"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("cj-widget-water-intake");if(f&&e.source===f.contentWindow&&e.data&&e.data.cjEmbedHeight){f.style.height=e.data.cjEmbedHeight+"px"}});</script>
<p style="font-size:12px;margin:4px 0 0">Free <a href="https://caloriejoy.com/calculator/water-intake" target="_blank">water intake calculator</a> by CalorieJoy</p> Free Ideal Body Weight Calculator Widget for Your Website
A realistic target weight range from height, age, and gender using multiple published formulas (Devine, Robinson, Miller).
<iframe src="https://caloriejoy.com/embed/calculator/ideal-body-weight" id="cj-widget-ibw" title="Ideal Body Weight Calculator" style="width:100%;max-width:640px;border:0;height:620px" loading="lazy"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("cj-widget-ibw");if(f&&e.source===f.contentWindow&&e.data&&e.data.cjEmbedHeight){f.style.height=e.data.cjEmbedHeight+"px"}});</script>
<p style="font-size:12px;margin:4px 0 0">Free <a href="https://caloriejoy.com/calculator/ideal-body-weight" target="_blank">ideal body weight calculator</a> by CalorieJoy</p> Frequently Asked Questions
Are these calculator widgets really free?
Yes - free forever, with no view limits, no watermark fees, and no premium tier. All we ask is that you keep the visible credit link under the widget - it is the only condition. We periodically review embedding sites, and widgets may be disabled where the credit link has been removed.
Do I need to sign up or get approval to embed a calculator?
No. There is no signup, no application, and no domain approval. Copy the embed code, paste it into your page, and the calculator works immediately on any domain.
Can I add these calculators to a WordPress site?
Yes. In the WordPress editor, add a "Custom HTML" block and paste the embed code into it. The widget works with any theme. A dedicated WordPress plugin is coming soon.
Do the widgets support dark mode?
Yes. By default the widget automatically matches your visitors' system light or dark preference. You can also force a look by adding ?theme=dark or ?theme=light to the iframe URL.
Will the widget slow down my website?
No. The iframe uses lazy loading, so it only loads when a visitor scrolls to it, and it runs in its own sandbox so it cannot block or break your page.
Is there a Ukrainian version?
Yes. Add /ua before the embed path - for example /ua/embed/calculator/bmi - and the widget renders in Ukrainian with metric units by default.
Need something customized?
Different size, colors to match your brand, a calculator we don't offer yet, or help getting the widget onto your site - contact us and we'll sort it out. Usually within a day.