CORNYVERSE

Every runner, from the weekend jogger to the marathon veteran, eventually asks the same question: "Am I training at the right intensity?" Pushing too hard leads to burnout and injury, while going too easy stalls progress. Finding that perfect balance has always been a mix of guesswork and complex formulas—until now. Meet Zone2cal , a powerful, all-in-one running calculator designed to take the guesswork out of your training. It’s a free, browser-based tool that provides everything you need to train smarter, safer, and more effectively, without requiring you to enter any personal information.   Key Features at a Glance ☑ Predict Race Times: Uses your current records to accurately forecast finish times for 5K, 10K, half, and full marathons. ☑ Calculate Your Zones: Precisely determines your Zone 2 heart rate for optimal endurance training using methods like Karvonen (HRR). ☑ Convert Paces Instantly: Seamlessly switch between running pace (min/km) and treadmill spee...

On treadmills, speed is shown in km/h ; outdoors we usually talk in min/km pace . Once you know the formula, the conversion is easy. 🔁 Convert speed ↔ pace instantly

When you start running, the first question pops up: which app should you run with? I built the habit with Runday , archived my workouts with Strava , and kept things fun with NRC (Nike Run Club).   🏃‍♀️ Open the Running Calculator