Free Health & Fitness Calculator Widgets
BMI, BMR, calorie, body-fat, macro, water-intake, pace and heart-rate-zone widgets for gyms, coaches and wellness blogs. Informational estimates, never a diagnosis.
Who these are for
Gyms, coaches, dietitians and wellness bloggers. Every widget is an informational estimate, not medical advice.
Common uses
- A BMI or calorie estimate beside a nutrition article
- Heart-rate zones and running pace on a training plan page
- A due-date estimate on a pregnancy resource page
How embedding works
Pick a widget, set the theme and size, copy one line of HTML and paste it into your page. It runs in its own frame, so it cannot clash with your site's styles, and it resizes itself if you use the loader.
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Body mass index with the WHO adult category and the healthy weight range for a height.
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Basal metabolic rate from Mifflin-St Jeor or the revised Harris-Benedict equation.
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Maintenance calories (TDEE) and daily targets for gradual weight loss or gain.
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Body fat percentage from tape measurements with the US Navy method, plus ACE category.
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Devine, Robinson, Miller and Hamwi ideal weights side by side, with the healthy BMI range.
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An estimated daily fluid range from body weight and exercise time, from published guidance.
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Daily grams of protein, carbohydrate and fat from calories and a macro split.
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Estimated due date, weeks pregnant, trimester and key dates from LMP, conception or IVF.
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Estimated ovulation day and fertile window for the next three cycles.
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Estimated max heart rate and five training zones, with optional Karvonen zones.
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Pace per km and per mile from distance and time, or finish time from a target pace.
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Estimated 1RM from a set of 1-12 reps by Epley and Brzycki, with a training-load table.
No widget matches that search.
Other widget categories
How to add a widget
Open a widget, choose the theme, width and style, check the live preview, then copy the code. Paste it into an HTML or "Custom code" block on your site - step-by-step instructions for each platform.