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Simple admin dashboard with HTML and CSS.

A collaborative task management system built entirely in Google Sheets. Apps Script automates reminders, updates status, and summarizes tasks by user or due date.

HealthCalc Pro is a premium, fully functional health and fitness tool built in a single HTML file using pure HTML, CSS, and vanilla JavaScript. It helps users instantly calculate: BMI (Body Mass Index) with clear category (Underweight, Normal, Overweight, Obese) Daily calorie needs (maintenance, weight loss, and weight gain) using the scientifically accurate Harris-Benedict formula Personalized suggestions based on results Beautiful, modern UI with dark/light mode toggle 100% offline – no internet, no API keys, no external dependencies Fully responsive – works perfectly on mobile, tablet, and desktop This tool is extremely practical for anyone interested in fitness, weight management, diet planning, or general health tracking – gym enthusiasts, students, trainers, nutritionists, and everyday people all love it. You can easily sell this on platforms like Gumroad, Etsy, or CodeCanyon for $19–$49 as a "Premium Single-File Health & Fitness Calculator Template". Buyers get just one file to download, open in any browser, and start using immediately – no setup required! Key Features & Details Accurate Calculations: BMI = weight (kg) ÷ height² (m) BMR calculated using revised Harris-Benedict equation (different for male/female) TDEE (Total Daily Energy Expenditure) based on 5 activity levels Shows calories needed to maintain, lose (~0.5kg/week), or gain weight (~0.5kg/week) User Input Fields: Age (years) Gender (Male/Female) Weight (kg) Height (cm) Activity Level (5 options from sedentary to extra active) Beautiful Result Display: Large BMI number with color-coded category Clear calorie recommendations Helpful personalized tip based on BMI Extra Features: Smooth dark/light theme toggle Input validation with friendly alert Results auto-scroll into view Glassmorphism design with gradient background Technical Details: Single HTML file (~250 lines) Uses Google Fonts (Poppins) – loads from CDN No frameworks, no libraries, no backend Works offline after first load Easy to customize (change colors, add logo, translate, etc.) Why People Will Buy It Health and fitness niche is evergreen and highly searchable Extremely useful daily tool (people check BMI/calories regularly) One-file simplicity = instant value for buyer Professional look that feels like a paid app Great for portfolios, side hustles, or reselling with modifications

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