Client wants to know if an hour of Saturday morning football cancels out last night's pizza. You need an honest calorie estimate from a specific activity before the conversation turns unhelpful.
Calorie Burn Estimator
Nutrition
Imperial: lb auto-converts
Calories = MET × Weight (kg) × Time (hrs)
MET (Metabolic Equivalent of Task) = energy cost relative to rest. Sitting = 1.0 · Walking = 3.5 · Running = 7–12+
Results are estimates for planning purposes. Verify with current standards and a qualified professional.
1 What this calculator does
Estimates calories burned during any physical activity using MET (Metabolic Equivalent of Task) values. Enter weight, activity type and duration to get total calories burned and burn rate per minute. Uses the validated MET formula from the Compendium of Physical Activities.
2 Formula & professional reasoning
Calories burned = MET x Weight (kg) x Duration (hours)
Burn rate (kcal/min) = MET x Weight (kg) / 60
MET = metabolic equivalent -- multiples of resting metabolic rate
MET assigns a number to each activity representing how many times resting metabolic rate it requires. Walking at moderate pace is MET 3.5. Running at 10 km/hr is MET 10. The formula multiplies MET by body weight (kg) and duration in hours to give total kcal. This is accurate within +-15% for most people -- it slightly overestimates for unfit individuals and underestimates for highly trained athletes.
3 Worked examples
⚠️ Illustrative example only — not clinical or professional instruction.
Basic
30-minute brisk walk
Given: Weight: 80 kg | Activity: brisk walking (MET 4.3) | Duration: 30 min (0.5 hrs)
Working:
Calories: 4.3 x 80 x 0.5Answer: 172 kcal burned | 5.7 kcal/min
💡 Equivalent to approximately 22 g of body fat theoretically. Walking burns less than most people assume -- diet has far more impact than exercise for fat loss.
Standard
60-minute strength training session
Given: Weight: 82 kg | Activity: general weight training (MET 3.5) | Duration: 60 min
Working:
Calories: 3.5 x 82 x 1.0Answer: 287 kcal burned | 4.8 kcal/min
💡 Strength training MET is lower than many expect. The biggest benefit of strength training for fat loss is building muscle mass that elevates BMR permanently, not the calories burned during the session.
Advanced
Comparing activities for same time investment
Given: Weight: 75 kg | Cycling 20 km/hr (MET 8.0) vs running 10 km/hr (MET 10.0) | 45 min each
Working:
Cycling: 8.0 x 75 x 0.75 = 450 kcal | Running: 10.0 x 75 x 0.75 = 562 kcalAnswer: Cycling: 450 kcal | Running: 562 kcal -- running burns 25% more in same time
💡 For equal time, running burns more than cycling. However, impact tolerance, injury risk and enjoyment often matter more than marginal calorie differences for long-term adherence.
4 Sanity check
Common MET values
Sleeping 0.9 | Sitting 1.3 | Walking moderate 3.5 | Cycling moderate 6.8 | Running 10 km/hr 10.0 | HIIT 8.0 | Swimming laps 6.0 | Heavy weightlifting 5.0
Exercise calorie burn vs food
30 min moderate exercise: 150-300 kcal | Average meal: 500-800 kcal
Exercise alone is rarely sufficient for significant fat loss without dietary changes.
Weight effect on burn
Calorie burn scales linearly with weight -- 100 kg person burns 25% more than 80 kg person
Formula accuracy
MET formula accurate to approximately +-15% for most activities and individuals
Actual burn depends on fitness level, terrain, temperature and individual metabolism.
5 Common errors
| Error | Cause | Consequence | Fix |
|---|---|---|---|
| Using exercise burn to 'earn' food without tracking intake | Overestimating how many calories exercise burns | Calorie compensation -- eating back more than was burned, preventing fat loss | Exercise burn is often 50-70% of what fitness trackers report. Use TDEE (which already includes activity level) as the baseline and resist eating back exercise calories unless training for endurance performance. |
| Using a generic MET without specifying intensity | Selecting 'running' without noting pace | Estimate significantly wrong -- running MET ranges from 6 (jogging) to 16+ (fast sprinting) | Select the most specific activity option available that matches your actual effort and speed. |
| Not accounting for skill affecting calorie burn | Applying standard MET to activities where technique matters | Experienced swimmers burn fewer calories than beginners for the same distance due to efficiency | MET values represent average energy cost. Skilled athletes may burn 15-25% fewer calories than beginners at the same activity. |
| Using estimates for clinical nutrition planning without professional oversight | Over-relying on calculator estimates for medical weight management | Inaccurate calorie balance in a clinical context | For clients with medical conditions (diabetes, heart disease, eating disorders), always involve a dietitian or physician in calorie target setting. |
6 Reference & regulatory links
7 Professional workflow
Common tools used alongside this one: