🧮 Body Metrics & Weight
📏
BMI Calculator
Body Mass Index — check if your weight is healthy for your height.
💪
Body Fat % Calculator
Estimate body fat using the US Navy circumference method.
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Lean Body Mass Calculator
How much of your weight is lean tissue vs fat.
⚖️
Ideal Body Weight Calculator
Devine formula for ideal weight by height.
🎯
Reverse BMI Calculator
Target weight from your height and goal BMI.
📐
Waist-to-Height Ratio
Simpler health risk indicator than BMI.
🟩
BSA Calculator
Body Surface Area using 5 medical formulas.
🥗 Energy & Nutrition
🔥
BMR Calculator
Mifflin-St Jeor formula for calories burned at rest.
⚡
TDEE Calculator
Total Daily Energy Expenditure = BMR x activity.
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Calorie Calculator
Daily calorie needs based on BMR + activity level.
📉
Calorie Deficit Calculator
Weekly fat loss from your deficit — sustainable or aggressive?
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Macro Calculator
Protein, carbs, and fat targets for your goal.
💧
Water Intake Calculator
Daily hydration needs from weight + activity.
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kJ ↔ Calories Converter
Convert kilojoules to Calories for any nutrition label.
🥩
Protein Calculator
Daily protein target by weight, activity, and goal.
🏃 Fitness & Exercise
❤️🔥
Heart Rate Zones
Karvonen method — 5 training zones from resting HR.
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Target Heart Rate
Simple % of max HR for fat burn, cardio, peak training.
⏱️
Pace Calculator
Convert min/mile ↔ min/km ↔ mph ↔ km/h instantly.
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Calories Burned by Distance
Walk/run/cycle distance → calories — no pace needed.
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MET to Calories
Estimate calories burned for any activity by MET value.
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Steps to Calories
Steps to calories burned, by body weight.
🏋️
One Rep Max (1RM)
Estimate your max lift from any weight x reps.
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Race Time Predictor
Predict 5K/10K/half/marathon from any race result.
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VO2 Max Calculator
Cardiovascular fitness from resting HR, Cooper, or Rockport.