Professional calculators to help you plan training runs, set race goals, and optimize your performance. All tools are free and require no signup.
Whether you're planning your weekly long run or strategizing for race day, our pace calculator helps you dial in the perfect pace. Simply enter two values, and we'll calculate the third. Switch between miles and kilometers with ease.
Use ToolUsed by runners worldwide, our race time predictor uses the scientifically-validated Riegel formula to estimate your potential race times. Enter a recent race result, and we'll predict your performance across all standard race distances.
Use ToolVO2 max is the gold standard for measuring aerobic fitness. Our calculator uses scientifically validated formulas to estimate your VO2 max based on race performance, giving you insights into your cardiovascular fitness and training potential.
Use ToolTraining at the correct intensity is crucial for improvement. Our calculator determines your personalized heart rate and pace zones using both simple and Karvonen formulas, helping you maximize the benefits of every training session.
Use ToolWhether you're running for fitness or weight loss, understanding your calorie burn is essential. Our calculator provides accurate estimates based on weight, distance, and pace, with helpful food comparisons to visualize your effort.
Use ToolOur free tools are great for quick calculations, but if you need a complete personalized training plan with daily workouts, progressive overload, and recovery weeks, we've got you covered.
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