Free Health Tools
& Calculators
10 science-backed calculators. Instant results. No signup. No data stored. Just the numbers you need.
Explore All Tools ↓All Health Calculators
Pick a tool, enter your numbers, get instant results
⚖️
BMI Calculator
Check your Body Mass Index and weight category
🔥Calorie Calculator
Daily calories to maintain, lose, or gain weight
💧Water Intake Calculator
How much water you actually need per day
📏Body Fat Calculator
Estimate body fat percentage using the Navy method
🎯Ideal Weight Calculator
Your ideal weight from 4 medical formulas
🤰Pregnancy Due Date
Expected due date and trimester timeline
❤️Heart Rate Zones
Training zones for fat burn, cardio, and peak
😴Sleep Calculator
Optimal bedtime and wake time for sleep cycles
🥗Macro Calculator
Protein, carbs, and fat split for your goal
⚡BMR Calculator
Basal Metabolic Rate — calories at rest
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Body Fat Percentage: Ranges, Risks, and How to Measure
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The Truth About Ideal Weight Charts
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Heart Rate Zones Explained: Train Smarter, Not Harder
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Why Sleep Cycles Matter More Than Hours
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Macros vs Calories: Which Should You Track?
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BMR and Metabolism: Why Your Body Burns What It Burns
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Pregnancy Nutrition: Trimester-by-Trimester Guide
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