Fitness & Health calculators
Science-backed calculators for energy needs, nutrition, body metrics, strength and running — each with clear explanations and actionable guidance.
Calories
Nutrition
Macro Calculator
Split your calories into protein, carbs & fat.
Protein Calculator
Your daily protein target, dialled in.
Water Intake Calculator
How much water to drink each day.
Meal Split Calculator
Divide your daily calories across meals.
Creatine Calculator
Loading and maintenance doses for you.
Caffeine Calculator
Safe limits and a pre-workout dose.
Body
BMI Calculator
Check your Body Mass Index in seconds.
Body Fat Calculator
Estimate body fat % with a tape measure.
Lean Body Mass Calculator
How much of you is not fat.
FFMI Calculator
Measure your muscularity, height-adjusted.
Ideal Weight Calculator
A healthy weight range for your height.
Waist to Hip Ratio Calculator
A quick read on health risk from shape.
Training
One Rep Max Calculator
Estimate your max lift from any set.
Workout Volume Calculator
Total tonnage lifted in a session.
Progressive Overload Calculator
Plan your weight increases week by week.
Calories Burned Calculator
Energy spent on any activity.
Heart Rate Zone Calculator
Your five training zones in bpm.
Running
New calculators, straight to your inbox
Fresh calculators, practical guides and product updates. No spam — unsubscribe anytime.