Sleep Cycles
90-minute sleep cycles, NSF duration recommendations by age, and bedtime math that works backward from your alarm.
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Body Calculators
Our hub for body metrics. BMI, body fat, ideal weight, BMR: every formula sourced from WHO, CDC, or…
Run the numbers →Nutrition Calculators
Our hub for nutrition math. Calories, TDEE, macros, protein, water: AMDR ranges and RDA values from USDA and…
Run the numbers →Fitness Calculators
Our hub for cardio and recovery math. Heart rate zones, max heart rate, running pace, steps conversion, sleep…
Run the numbers →Strength Calculators
Our hub for strength math. 1RM estimation and the big three lifts, with percentage tables for programming.
Run the numbers →Pregnancy Calculators
Our hub for pregnancy math. Due date, ovulation, conception, fetal weight, and weight gain: clinical guidelines cited, always…
Run the numbers →Medical Calculators
Our hub for clinical conversions. A1C to average glucose, GFR staging, BAC, MAP, creatinine clearance: clinical formulas, educational…
Run the numbers →