Health & Fitness Calculators
Free health calculators for BMI, calories, macros, body fat percentage, heart rate zones, and protein intake. Track your fitness goals with instant, private results.
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Frequently Asked Questions
What health calculators are available?▾
NexTool offers free health and fitness calculators including BMI, TDEE and calorie needs, macro nutrient breakdown, body fat percentage, target heart rate zones, protein intake estimator, and more.
How accurate are the health calculators?▾
Our health calculators use widely accepted formulas (Harris-Benedict, Mifflin-St Jeor, Katch-McArdle) that are trusted by fitness professionals. They provide reliable estimates, though individual needs may vary.
Is my health data kept private?▾
Absolutely. All health calculations run entirely in your browser. No personal health information is ever transmitted to our servers or stored anywhere. Your data disappears when you close the tab.
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