USA Health & Fitness 2026

Free, accurate tools for BMI, BMR, calorie intake, RPE, ABG, and more – with CDC/NIH guidelines.
Track your health with confidence – updated for 2026

BMI Calculator

Body mass index (CDC classifications)

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BMR / RMR

Basal metabolic rate (Mifflin-St Jeor)

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Calorie Intake

Daily needs based on activity level

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RPE (Borg Scale)

Rating of Perceived Exertion

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ABG Interpreter

Arterial blood gas analysis

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Body Fat %

Navy, Jackson-Pollock, BMI method

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VO₂ Max

Cardiorespiratory fitness estimate

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Pace / Workout

Running pace, calories burned

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Ideal Weight

Hamwi, Devine, Miller formulas

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Pregnancy Due Date

Estimated due date & milestones

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Based on CDC & NIH guidelines Updated for 2026 100% Free • No registration

Why health enthusiasts trust us

Evidence‑based

Formulas from peer‑reviewed medical literature.

Updated for 2026

Reflects latest health guidelines.

Works on all devices

Track your health on the go.