Free calorie calculators for 14+ activities with features generic tools miss: 🏃 Walking/Running: Speed-aware MET calculations 🏋️ Treadmill: Incline adjustment (0-15%) 🚴 Cycling: Speed-based intensity 🚣 Rowing: Stroke rate optimization 🎒 Rucking: Pack weight included All calculators feature real-time updates, metric/imperial units, and duration projections. No signup required. Built for fitness enthusiasts, trainers, and athletes who need precision, not guesswork.