All Hyroxs calculators
HYROX Fitness Calculator: Track Every Metric That Matters
Every metric you need to understand your body composition, energy needs, and true fitness potential — free, science-backed, and built for HYROX athletes.
Body Fat Percentage Calculator
Estimate your body fat using the U.S. Navy circumference method.
Calculate nowBMI Calculator
Check your body mass index and see where you fall on the standard scale.
Calculate nowBMR Calculator
Find your basal metabolic rate — the calories your body burns at rest.
Calculate nowCalorie Calculator
Get your daily calorie needs for maintenance, fat loss, or muscle gain.
Calculate nowLean Body Mass Calculator
Find out how much of your weight is muscle, bone, and organ mass.
Calculate nowFFMI Calculator
Check your fat-free mass index and see your natural muscle potential.
Calculate nowIdeal Weight Calculator
Get your ideal weight range based on height, gender, and frame.
Calculate nowBody Recomposition Calculator
Plan your fat loss and muscle gain targets at the same time.
Calculate nowMost people track one number: the scale. But body weight alone hides more than it reveals. Two athletes can weigh the same and have completely different body compositions, calorie needs, and muscle potential. HYROXS built eight free calculators so you can measure what actually drives performance and progress, not just what the scale says on a given morning.
Whether you are prepping for your next HYROX race, cutting fat while holding onto muscle, or simply trying to understand your body better, these tools give you the numbers behind the goal.
Why Use a Calculator Instead of Guessing
Guesswork is the most common reason fitness plans stall. Someone eats too little because they assume their maintenance calories are lower than they are. Someone trains for months without knowing if they are actually losing fat or just losing weight. A calculator removes that guesswork by grounding your plan in your actual measurements, not averages pulled from someone else’s routine.
Each tool below uses established, validated formulas (U.S. Navy method, Mifflin-St Jeor, Hume, and others depending on the metric) so the numbers you get are reliable enough to build a real plan around.
How These Calculators Work Together
No single number tells the full story, which is why the calculators are designed to be used together rather than in isolation.
- Start with Body Fat Percentage to understand your current composition.
- Check Lean Body Mass and FFMI to see how much muscle you are carrying and how close you are to your natural potential.
- Use BMR and Calorie Calculator to set your daily energy targets based on your goal.
- Run Body Recomposition if you want to lose fat and build muscle at the same time.
- Use Ideal Weight and BMI as general reference points, not hard targets.
Used this way, the calculators move you from “I want to get fitter” to a specific, measurable plan.
Built for HYROX Athletes
HYROX training demands a body that is strong, lean, and efficient under fatigue. Carrying excess fat slows your run splits. Carrying too little muscle limits your power on stations like the sled push or wall balls. These calculators are tuned with that balance in mind, helping you find the composition that supports race performance rather than just a number on a chart.