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Both calculators run independently — change the inputs on either side to compare results.

Body Fat Percentage Calculator

Estimate body fat percentage using the US Navy circumference method (waist, neck, and for women hip measurements). Use it as a no-equipment-needed alternative to skinfold calipers, BIA, or DEXA for tracking body composition trends.

Gender

Height (cm)

Waist Circumference (cm)

Neck Circumference (cm)

Hip Circumference (Females Only) (cm)

Fill in the required fields to see your result.

Fitness

Protein Intake Calculator

Estimate daily protein need (grams) from body weight, training intensity, and goal (maintain, build, or lose weight). Targets evidence-based ranges for active people: 1.2–2.2 g protein per kg body weight depending on activity and objective.

Weight (kg)

Activity Level

Goal

Fill in the required fields to see your result.

Key differences

	Body Fat Percentage Calculator	Protein Intake Calculator
Category	Fitness	Fitness
Inputs required	5	3
Result	Body Fat Percentage (%)	Daily Protein Needed (g)
What it does	Estimate body fat percentage using the US Navy circumference method (waist, neck, and for women hip measurements). Use it as a no-equipment-needed alternative to skinfold calipers, BIA, or DEXA for tracking body composition trends.	Estimate daily protein need (grams) from body weight, training intensity, and goal (maintain, build, or lose weight). Targets evidence-based ranges for active people: 1.2–2.2 g protein per kg body weight depending on activity and objective.