💪 Health & Fitness Tools
BMI, calories, protein, heart-rate zones — evidence-based fitness calculators.
All health & fitness tools
BMI Calculator
Body mass index in metric or imperial, with healthy range.
Calorie Calculator
BMR and daily calories to maintain, lose or gain weight.
Ideal Weight Calculator
Ideal body weight by four standard formulas.
Water Intake Calculator
Daily water target from your weight, exercise and climate.
Running Pace Calculator
Solve pace, finish time or distance for any run.
Heart Rate Zone Calculator
Your 5 training zones, with optional Karvonen method.
Sleep Cycle Calculator
Bedtimes and wake times aligned to 90-minute sleep cycles.
Steps to Km & Calories
Turn a step count into distance and calories burned.
Body Fat Calculator
Estimate body fat percentage with the Navy method.
BMR Calculator
Calories burned at rest — two standard formulas compared.
Protein Calculator
Daily protein target by body weight and training goal.
Waist-to-Hip Ratio
WHR with WHO risk bands — where you carry weight matters.
Due Date Calculator
Pregnancy due date, trimesters and current week from LMP.
About these tools
Estimate calorie needs with the Mifflin-St Jeor equation, compare BMR formulas, set protein targets by training goal, check BMI, body fat and waist-to-hip ratio against published bands, plan running paces, heart-rate zones, sleep cycles and hydration. Every calculator names the formula or study it uses — these are planning aids, not medical advice, and they say so.
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