About this tool

MyWellnessCalc offers 21+ free, easy-to-use calculators for health and fitness tracking, including BMI, calorie deficit, macro split, intermittent fasting windows, body fat percentage, ideal weight, heart rate zones (Zone 2, MAF, fat-burning), VO2 max-related running pace, vitamin D needs, and protein intake by age and activity level. Each tool is built to give instant, accurate results with no sign-up required, plus in-depth guides explaining how to use the numbers to reach your health goals.