8 free tools · private, no signup
Health Calculators & Tools
Instant, science-backed calculators. All math happens in your browser — nothing is sent or stored.
BMI + Healthy Weight
Body-mass index and a healthy weight range for your height.
BMR / TDEE
Estimate calories burned per day at your activity level.
Macro Split
Protein, carbs & fat targets from your goal and TDEE.
Water Intake
Daily water goal based on weight and activity level.
Bedtime / Sleep
Reverse-engineer bedtime from wake time and sleep cycles.
Go to bed at
21:469.0h · 6 cycles
23:167.5h · 5 cycles
00:466.0h · 4 cycles
Includes ~14 min to fall asleep.
Waist-to-Hip Ratio
A simple metabolic-risk indicator that's better than BMI alone.