Calories burned calculator

A calories-burned estimate helps you understand what a workout costs in energy—not so you can “earn” junk food, but so you can plan fuel around training and daily targets. This free calculator uses MET × body weight × time, the same convention used in the Compendium of Physical Activities for common adult exercises.

What MET means in plain language

MET stands for metabolic equivalent of task. One MET is roughly the energy cost of quiet sitting. A brisk walk near 3.5 mph is about 4.3 METs; easy jogging around 6 mph is near 9.8 METs; moderate cycling is often listed near 6.8; general weight training about 5.0; hard HIIT intervals around 8.0; and freestyle swimming at a moderate effort near 7.0. Multiply MET by your weight in kilograms and by hours of activity to estimate kilocalories for that session.

Example: a 70 kg adult walking briskly for 30 minutes uses about 4.3 × 70 × 0.5 ≈ 150 kcal for that bout. The same person running 6 mph for 30 minutes lands closer to 9.8 × 70 × 0.5 ≈ 343 kcal. Wearables may disagree because they blend heart rate, personal history, and proprietary models—treat MET math as a transparent baseline, not a lab measurement.

How to use the estimate without overthinking

Log the activity you actually did, not the hardest option on the list. Incline, stop-and-go traffic, carrying loads, heat, and poor sleep all change real burn. If you train with short rests, HIIT or circuit METs can be closer than a steady-state label; if you stroll and chat, casual walking numbers fit better than a race pace.

Keep session burn separate from your daily calorie target. TDEE already includes average activity. Adding every workout on top of a fully active TDEE can inflate intake. A practical approach: set daily calories with the free TDEE calculator, then use this tool to compare workouts or decide whether a long hike deserves an extra snack—not a free-for-all.

Weight units, duration, and honesty checks

Enter body weight in kilograms or pounds; the tool converts pounds to kilograms before applying MET. Duration should be moving time. Warm-up and cool-down at easy effort can use a lower MET if you want finer detail, or fold a few minutes into the main activity for a simple weekly log.

If estimated burn seems huge compared with how you feel, check weight units and minutes. A common mistake is entering pounds while leaving the unit on kilograms—or logging two hours when only forty minutes were truly working sets. Recalculate after major weight change so the kilogram term stays current.

Pairing exercise burn with nutrition

Strength days often need protein and carbohydrates around the session more than they need perfect kcal math. Endurance days may call for earlier carbs and fluids. Use burned-calorie estimates to rank sessions (“this run was roughly double yesterday’s walk”) and to brief meal timing—not to justify restricting food below recovery needs.

Watch weekly weight and energy averages for two to four weeks. If weight drifts up while training rises sharply, intake may be tracking every MET calorie twice. If weight crashes and workouts stall, you may be under-fueling relative to real expenditure. Adjust food or steps before chasing exotic MET tables.

Limits of any MET calculator

Compendium values are population averages for adults. Younger athletes, very large or small bodies, pregnancy, some medications, and neuromuscular conditions can move true cost. The calculator does not diagnose fitness or prescribe training. Stop and seek care for chest pain, faintness, or unusual breathlessness during exercise.

FreeNutri keeps this tool free without signup so you can sanity-check a session in seconds, then return to meal planning. Combine it with the TDEE calculator, protein targets, and a simple training log. Consistency beats precision theater: the same method week after week is more useful than switching formulas whenever an app shows a different number.