Calories Burned Calculator · Practical guide
Calories Burned Calculator for Weight Loss
Plan a realistic deficit: combine exercise burn with diet changes to lose about a pound a week.
At a glance
The short answer
One pound of body fat stores roughly 3,500 calories, so a sustained 500-calorie daily deficit leads to about 1 lb of weight loss per week. Exercise alone rarely creates that full deficit — the practical approach is burning 200-300 calories through activity and cutting the rest from food.
Interactive tool
Calories Burned Calculator
Enter your own values, then compare the result with the examples below.
Energy Expenditure
A realistic weekly example
A 155 lb person running 30 minutes five days a week burns about 1,810 calories per week — close to half a pound of fat from exercise alone. Swapping in lower-impact days still adds up: three 30-minute runs plus two 30-minute brisk walks totals roughly 1,344 weekly calories.
| Activity (30 min, 155 lb) | Calories | 5x per Week |
|---|---|---|
| Brisk walking | 129 kcal | 645 kcal |
| Cycling | 277 kcal | 1,385 kcal |
| Swimming | 295 kcal | 1,475 kcal |
| Running | 362 kcal | 1,810 kcal |
Why the calculator helps
Estimates keep your plan honest. Many people overestimate workout burn and eat back more than they spent. Running the numbers for your actual weight and duration shows that a single 30-minute session offsets a snack, not a full meal — useful context when sizing your calorie deficit.
Sustainable targets
Aim for 0.5-1 lb of loss per week. Larger deficits are hard to maintain and often cost muscle. As your weight drops, recalculate: a lighter body burns fewer calories for the same workout, so the plan needs periodic adjustment.
Frequently Asked Questions
How many calories do I need to burn to lose 1 pound?
About 3,500 calories more than you eat. Spread over a week, that is a 500-calorie daily deficit, usually split between eating less and moving more.
Should I eat back the calories I burn exercising?
Usually not all of them. Estimates are based on averages and can run high. Eating back half your estimated burn is a safer approach when weight loss is the goal.
Why did my weight loss slow down after a few months?
As you lose weight, your body burns fewer calories at rest and during the same workout. Recalculate your burn at your new weight and adjust intake to keep the deficit intact.
Is diet or exercise more important for weight loss?
Diet drives most of the deficit — cutting 300 calories from food is far easier than burning 300 through exercise. Exercise preserves muscle and supports maintenance once the weight is off.