Fitness Calculators

Estimate your BMI, BMR and TDEE to understand your baseline and plan your nutrition.

BMI

BMR

kcal/day
Mifflin-St Jeor

TDEE

kcal/day
Based on activity

What these numbers mean

BMI is a general index and doesn’t distinguish muscle vs fat — athletes may read “high.” BMR is your resting energy burn. TDEE is your daily maintenance calories (what keeps your weight stable).

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Macro Calculator

Turn your TDEE into daily macros. Choose a goal and protein target.

Tip: 1g protein = 4 kcal, 1g carb = 4 kcal, 1g fat = 9 kcal.

1RM Estimator

Estimate your 1‑rep max from a heavy set.