Free Fitness, Athletics & Biometrics Hub No Email Needed
Free, private, browser-based fitness calculators for TDEE, macronutrient nutrition, Karvonen heart rate zones, 1RM strength, and hydration targets.
TDEE & Macro Calorie Calculator
Calculate Total Daily Energy Expenditure (TDEE), Basal Metabolic Rate (BMR), and exact macro gram targets for cutting, bulking, and maintenance.
Target Heart Rate Zone Calculator
Calculate your 5 cardiovascular heart rate training zones (Zone 1 to Zone 5) using the Karvonen formula and Heart Rate Reserve (HRR).
Daily Water Intake & Hydration Calculator
Calculate exact daily water intake in liters and fluid ounces tailored to your body weight, workout intensity, and climate heat.
One Rep Max (1RM) Calculator
Calculate your estimated 1-Repetition Maximum (1RM) for bench press, squat, and deadlift across Brzycki, Epley, and Lombardi formulas with 50-95% load tables.
Weight Loss Percentage & Pace Calculator
Calculate total body weight loss percentage (%), average weekly loss pace, and projected date to reach your goal weight.
About the Fitness, Athletics & Biometrics Hub
Scientific fitness tracking requires accurate mathematical modeling of human energy metabolism, cardiovascular training zones, and progressive neuromuscular overload. The Fitness, Athletics & Physiology Hub delivers zero-upload client-side tools designed for runners, strength athletes, and nutrition planners.
Utilize the Mifflin-St Jeor equation for basal metabolic rate, Karvonen heart rate reserve formulas for Zone 2 endurance pacing, and multi-formula 1RM strength benchmarks (Brzycki, Epley, Lander) without subscription fees or data harvesting.