Health & Lifestyle tools

BMI, calorie burn, hydration, sleep cycles, running pace — practical health math without the wellness woo.

• BMI Calculator Calculate Body Mass Index in metric or imperial units. WHO categories explained. Screening tool, not medical advice.
• Calorie Burn Calculator Estimate calories burned during exercise using MET values. ~50 activities from walking to CrossFit.
• Water Intake Calculator Estimate daily fluid intake based on weight, activity, climate, and life stage. Sensible math instead of "8 glasses a day".
• Sleep Cycle Calculator Calculate optimal bedtimes and wake times using 90-minute sleep cycles. Wake refreshed at the end of a cycle.
• Pace Calculator Solve for pace, time, or distance. 5K, 10K, half, marathon, and any custom distance. Splits table included.