Calories burned doing push-ups based on reps and body weight.
Push-ups are primarily a strength exercise, not a significant calorie-burning activity on their own. A set of 50 push-ups for an average person burns roughly 30–50 calories. Their real value is building upper body strength (chest, shoulders, triceps) and core stability.
For calorie burning, combine push-ups with higher-MET activities like running or HIIT. Push-ups in a circuit format with minimal rest can elevate heart rate enough to approach moderate aerobic intensity.