About FitForge

FitForge is a free suite of fitness calculators designed to help you understand your body composition, plan your nutrition, and optimize your training. Every calculator uses formulas from published scientific research.

Our Calculators

• Body Metrics: BMI, body fat percentage, ideal weight, lean body mass
• Nutrition: TDEE, macros, calorie deficit, protein intake, hydration
• Training: One-rep max, heart rate zones, running pace, VO2 max, calories burned

Accuracy

Our calculators use well-established formulas including Mifflin-St Jeor (TDEE), U.S. Navy method (body fat), Epley/Brzycki (1RM), Karvonen (heart rate zones), and Uth (VO2 max). Results are estimates and should not replace professional medical advice.

Contact

Questions or suggestions? Visit our contact page.