Free calculators
BMR, TDEE and body fat percentage, with the formulas personal trainers and nutritionists use. Free, no sign-up.
TDEE and BMR calculator
BMR, the resting metabolic rate from the Mifflin-St Jeor equation, and total daily energy expenditure from the activity level.
Body fat calculator
17 methods at once: skinfolds (Jackson-Pollock, Durnin-Womersley and others), circumferences (US Navy) or just weight, height and waist (RFM, CUN-BAE).