Health & Fitness
Evidence-based calculators for nutrition, fitness, and wellness — all running privately in your browser with no data stored.
Suite Size
19
health calculators
BMR Calculator
Calculate Basal Metabolic Rate using the Mifflin-St Jeor equation. See TDEE and calorie targets by goal.
Open Calculator
TDEE Calculator
Calculate Total Daily Energy Expenditure based on your activity level. Includes cut, maintenance, and bulk targets.
Open Calculator
Calorie Calculator
Find your daily calorie intake for weight loss, maintenance, or muscle gain with macro breakdown.
Open Calculator
Macro Calculator
Calculate daily protein, carbohydrate, and fat targets based on your calorie goals and body weight.
Open Calculator
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method. Supports metric and imperial.
Open Calculator
Ideal Weight Calculator
Calculate ideal body weight using Devine, Robinson, Miller, and Hamwi formulas with BMI-based range.
Open Calculator
Lean Body Mass Calculator
Calculate lean body mass (fat-free mass) using Boer, James, and Hume formulas.
Open Calculator
Water Intake Calculator
Calculate daily water needs based on weight, age, activity level, climate, and pregnancy status.
Open Calculator
Pregnancy Due Date Calculator
Calculate estimated delivery date using Naegele's rule. See pregnancy milestones and trimester dates.
Open Calculator
Ovulation Calculator
Calculate ovulation date and fertile window for 1–6 cycles based on last period and cycle length.
Open Calculator
Pregnancy Weeks Calculator
Find out how many weeks pregnant you are from LMP. Includes baby size comparisons and trimester progress.
Open Calculator
Menstrual Cycle Calculator
Predict next period, fertile window, and ovulation dates for upcoming cycles. Identifies current cycle phase.
Open Calculator
Child Height Predictor
Predict a child's adult height using the mid-parental height method. Optional current measurements improve accuracy.
Open Calculator
Running Pace Calculator
Calculate running pace, finish time, or distance. Get race predictions for 5K, 10K, half marathon, and marathon.
Open Calculator
One Rep Max Calculator
Calculate 1RM from any weight and rep count using 6 validated formulas. Includes training percentage table.
Open Calculator
Heart Rate Zone Calculator
Find your 5 training heart rate zones using Simple % Max HR or Karvonen HRR method.
Open Calculator
Sleep Cycle Calculator
Find the best bedtime or wake-up time aligned to 90-minute sleep cycles for waking refreshed.
Open Calculator
BAC Calculator
Estimate Blood Alcohol Content using the Widmark formula. Enter drinks, weight, and time to check impairment level.
Open Calculator
Smoking Cost Calculator
Calculate the financial and life cost of smoking. See yearly savings and years of life lost per cigarette.
Open Calculator