Fitness Calculators and Tools
Free interactive calculators and training tools built by Fitness Flash Report. Every tool runs in your browser, requires no signup, and uses the formulas named on each page.
Calculate your daily calorie needs. Get BMR, TDEE, weight loss goals, and macro breakdowns based on proven scientific formulas.
Calculate your Total Daily Energy Expenditure (TDEE). Get calorie burn estimates based on BMR and activity level for nutrition planning.
Calculate your Basal Metabolic Rate (BMR) using multiple proven formulas including Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle.
Calculate your BMI (Body Mass Index). Get BMI categories, health ranges, and weight recommendations based on WHO guidelines.
Calculate your body fat percentage using multiple proven methods including Navy formula, skinfold measurements, and BMI estimates.
Calculate your macronutrient breakdown (protein, carbs, fats) for your fitness goals. Supports balanced, keto, high-protein, and athletic approaches.
Calculate your daily protein needs. Get personalized protein recommendations based on activity level, goals, and scientific guidelines.
Calculate pre and post workout meal timing. Science-based nutrition timing calculator with personalized recommendations.
Build your personalized supplement stack with evidence-based recommendations for athletic performance and fitness goals.
Calculate your one rep max (1RM) with multiple proven formulas. Get percentage charts and training zone recommendations.
Barbell plate loading calculator for the gym. Calculate plate combinations for any weight with a visual plate display.
Calculate your Wilks coefficient to compare powerlifting performance across different body weights, with IPF approved formulas.
Calculate running pace, finish times, and split times for any distance. Includes marathon pacing, interval training zones, and race time predictions.
Calculate your heart rate training zones based on age and resting heart rate.