All Health & Fitness Calculators

21 free calculators. All run in your browser with science-backed formulas.

⚖️ Body & Weight

Calculate your Body Mass Index

BMI with CDC growth chart percentiles (ages 2-20)

Basal Metabolic Rate

Total Daily Energy Expenditure

Find your ideal weight range

Estimate body fat percentage

Assess health risk from body fat distribution

See when you'll reach your goal weight

Daily calorie goals for weight management

How many calories to eat to lose weight

Protein, carbs, and fat targets

Daily protein intake recommendations

Daily water intake goals

Calculate your one-rep max for any lift

Calories burned by exercise and activity

Running and walking pace calculator

Training heart rate zones

Optimal bedtime and wake time by sleep cycles

Estimate your due date and track pregnancy milestones

Estimate blood alcohol content using the Widmark formula

Calculate your biological fitness age vs chronological age