Health & Fitness Tools
Evidence-based health, body composition, and endurance training calculators. Compute ideal body weight with the Devine formula, target heart rate zones with Karvonen formula, split running paces per km and mile, and track calorie deficits with zero tracking.
Available Health & Fitness Tools (7)
Ideal Body Weight Calculator
Calculate your healthy ideal body weight range using Devine, Robinson, Miller, and Hamwi medical formulas.
Target Heart Rate Calculator
Calculate training heart rate zones for Fat Burn, Cardio Endurance, and Peak Anaerobic performance.
Running Pace & Race Time Calculator
Calculate running pace per mile or kilometer, finish times, and splits for 5K, 10K, Half, and Full Marathons.
Calorie Deficit & Weight Loss Calculator
Calculate daily calorie deficit targets, required daily calorie intake, and projected goal dates for healthy weight loss.
Lean Body Mass (LBM) Calculator
Calculate Lean Body Mass (LBM) and Fat Mass using Boer, James, and Hume formulas without specialized scales.
Sleep Cycle & Bedtime Calculator
Calculate optimal bedtime and wake-up times based on 90-minute REM sleep cycles to wake up energized.
Ovulation & Fertility Window Calculator
Estimate ovulation dates, fertile windows, and future menstrual cycle periods with cycle tracking math.
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Compress, resize, convert, crop, and optimize images locally in your browser.
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Format JSON, inspect JWTs, test regular expressions, encode Base64, and generate hashes.
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