How Long Do You Have to Exercise to Burn Off That Food?

Every food carries a calorie figure, and every activity has a burn rate — the calories it uses per minute. “Burning off” a food is simply the food's calories divided by that burn rate. There is no judgement in the number: it is not a verdict on whether the food is good or bad, just the arithmetic of how long the exercise would take to spend the same energy. The burn rate itself comes from the activity's MET value — a measure of intensity relative to sitting still — in the formula calories = MET × your weight in kilograms × hours × 1.05. The 1.05 is the standard Compendium basis (one MET burns about 1.05 calories per kilogram per hour); it is why the figures here line up with what a treadmill or fitness tracker shows.

Your bodyweight sits right inside the burn-rate formula, and it scales the result linearly: double the weight and you double the calories burned in the same minute of the same activity. So a heavier person spends a food's calories in fewer minutes than a lighter one doing the identical workout. That is also why a single “walk for 30 minutes to burn it off” rule of thumb is misleading — the honest answer depends on who is doing the walking, which is exactly why the calculator asks for your weight.

Gross vs net — why the real number is a bit higher

There is one honest caveat. The minutes above use the gross burn, which includes the calories you would have burned just sitting for that time. Because you were going to spend some energy anyway, the genuine extra exercise needed to offset a food is slightly less than the raw figure suggests. For the net read — the burn over and above resting, which is the figure that actually feeds a weight-loss deficit — switch to the main Calories Burned Calculator.

One session is one slice of your day, not the whole picture. Weight change is decided by your total energy balance over weeks, so chasing each treat with a workout rarely works on its own — it is easy to eat back what you burned. The reliable path is to size a moderate daily deficit and let exercise support it. Find your full daily burn with the TDEE Calculator, then turn it into a target with the Calorie Deficit Calculator. These are general estimates, not medical or nutritional advice.