How Hooping calculators work

Hooping calculators are built around published equations and common coaching heuristics. The goal is not to diagnose health status or prescribe treatment. The goal is to give readers a clear starting estimate and show the assumptions behind it.

Energy calculators

TDEE, calorie, BMR, macro, deficit, and surplus tools use Mifflin-St Jeor for resting metabolic rate unless a body fat percentage is supplied. When body fat is supplied, Katch-McArdle is used because it estimates resting needs from lean body mass. Activity multipliers range from sedentary to athlete-level training.

Body composition calculators

BMI uses the standard weight-to-height ratio. Body fat uses the U.S. Navy circumference method. Ideal weight compares Hamwi, Devine, Robinson, and Miller formulas. Lean body mass is calculated from body weight and body fat percentage.

Nutrition calculators

Macro targets use calorie presets and gram conversions of 4 kcal per gram for protein and carbohydrate and 9 kcal per gram for fat. Protein ranges are based on common sports-nutrition targets per kilogram of body weight or lean mass.

Performance calculators

Pace calculations solve distance, time, and average pace from unit conversions. One-rep max estimates use Epley, Brzycki, and Lombardi formulas, which are most useful for technically consistent sets of 2 to 10 reps.

Calculator index

• TDEE Calculator: Estimate total daily energy expenditure from BMR, activity level, and optional body fat percentage.
• Calorie Calculator: Find maintenance calories and compare activity levels for practical daily planning.
• BMR Calculator: Estimate basal metabolic rate using Mifflin-St Jeor or Katch-McArdle when body fat is supplied.
• BMI Calculator: Calculate body mass index and see the standard adult BMI category.
• Macro Calculator: Convert maintenance, deficit, and surplus calorie targets into protein, fat, and carb ranges.
• Body Fat Calculator: Estimate body fat percentage with the U.S. Navy circumference method.
• Ideal Weight Calculator: Compare Hamwi, Devine, Robinson, and Miller reference-weight formulas.
• Lean Body Mass Calculator: Estimate fat mass and lean mass from scale weight and body fat percentage.
• Water Intake Calculator: Estimate daily fluid needs from body weight, training time, and climate.
• Protein Intake Calculator: Generate daily protein ranges for maintenance, fat loss, and muscle gain.
• Calorie Deficit Calculator: Plan a weight-loss calorie target while respecting common minimum intake guardrails.
• Calorie Surplus Calculator: Estimate a gaining target and expected weekly weight change from a chosen surplus.
• Pace Calculator: Solve pace, finish time, or distance for running, walking, and cardio sessions.
• One Rep Max Calculator: Estimate one-rep max using Epley, Brzycki, or Lombardi formulas.

Known limitations

Every result is an estimate. Food-label error, water retention, menstrual cycle phase, medication, sleep, stress, illness, training status, and measurement technique can all change what a number means. Use calculator output as a baseline, then adjust from real-world trend data.