Exercise Calories Burned Calculator
Estimate the calories you burn during a workout based on your weight, exercise duration, and intensity. Useful for tracking energy expenditure when planning a calorie deficit or monitoring fitness progress.
About this calculator
The calories burned during exercise depend on body weight, how long you exercise, and the metabolic intensity of the activity. The formula used is: Calories = (intensity × weight × (duration / 60)) × 1.05. Here, intensity represents the MET-like energy rate (calories burned per kg per hour) for a given activity. Duration is converted from minutes to hours by dividing by 60. Weight in kilograms scales the output to the individual, since heavier bodies burn more energy performing the same movement. The 1.05 multiplier applies a 5% upward adjustment to account for post-exercise oxygen consumption (EPOC) — the elevated calorie burn that continues after exercise ends. Common intensity values range from roughly 3 for light walking to 10+ for vigorous running.
How to use
Example: A 75 kg person does 45 minutes of cycling at an intensity value of 7. Step 1: Convert duration — 45 / 60 = 0.75 hours. Step 2: Multiply — 7 × 75 × 0.75 = 393.75. Step 3: Apply the EPOC multiplier — 393.75 × 1.05 ≈ 413 calories burned. This means the session burns roughly 413 kcal in total. Adjust the intensity input to reflect different exercise types — a brisk walk (intensity ≈ 4) would yield a noticeably lower result for the same duration.
Frequently asked questions
How does body weight affect calories burned during exercise?
Body weight has a direct, linear relationship with calorie burn during exercise. A heavier person requires more energy to move their mass through any given activity, so calories burned scale proportionally with weight. This is why the formula multiplies intensity by body weight. Practically, a 90 kg person burns roughly 50% more calories than a 60 kg person doing the exact same workout at the same intensity for the same duration. This also means that as you lose weight during a fitness program, your calorie burn per session gradually decreases.
What is EPOC and why does it affect calories burned from exercise?
EPOC stands for Excess Post-exercise Oxygen Consumption, sometimes called the 'afterburn effect.' After intense exercise, your body continues to consume elevated oxygen — and therefore burn extra calories — while it repairs muscle tissue, restores oxygen stores, and returns hormone levels to baseline. The 1.05 multiplier in this calculator captures a conservative 5% EPOC contribution. Higher-intensity and longer-duration workouts produce greater EPOC effects, sometimes lasting several hours after the session ends. EPOC is most significant after high-intensity interval training (HIIT) or heavy resistance training.
How many calories does 30 minutes of walking burn?
For a 70 kg person, 30 minutes of brisk walking at an intensity value of roughly 4 would burn approximately (4 × 70 × 0.5) × 1.05 ≈ 147 calories. The result varies considerably with pace and terrain — uphill walking or carrying weight increases the intensity and therefore calories burned. Heavier individuals will burn more for the same walk, while lighter individuals burn less. Walking remains one of the most accessible forms of calorie-burning exercise and accumulates meaningfully over a full week.