Tools
Free Fitness Calculators
Quick, accurate calculators for the metrics that matter. Use them in the gym — no signup required.
One Rep Max (1RM)
Estimate your one rep max from any submaximal set. Epley, Brzycki, or Lombardi formulas.
→BMR — Basal Metabolic Rate
How many calories your body burns at complete rest. Mifflin-St Jeor equation.
→TDEE — Daily Energy Expenditure
BMR multiplied by activity level. Your maintenance calorie target.
→Body Fat % (US Navy)
Estimate body fat from tape measurements. No calipers required.
→Macro Calculator
Daily protein, carbs, and fat targets based on your TDEE and goal.
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