Stop guessing your training zones. This free calculator finds all 5 heart rate zones by your exact age and resting heart rate — including the Zone 2 fat burn sweet spot that cardiologists recommend, plus medication warnings fitness apps never warn you about.
You've got a goal finish time. Now you need to know: is your current pace fast enough to get there? Enter your distance and time — get your exact pace per mile and km, full race splits, and the training pace you need to run right now to hit your goal.
Most lifters are training with the wrong weights — because they're guessing their 1RM. This free calculator uses 7 research-backed formulas to find your true one rep max in seconds, then gives you exact training percentages for strength, hypertrophy and power. No gym testing required.
BMI told millions of people they were healthy. Body fat testing told a different story. This free Navy Method calculator reveals your true body fat percentage in seconds — your health risk category, exact lean vs. fat mass, and the precise fat loss target doctors actually use. No gym equipment needed. Just a tape measure.