Understanding Quarantine Activity Levels
During quarantine, lockdown, or extended work-from-home periods, daily physical activity typically drops significantly. The commute to work, walking between meetings, taking the stairs, and other incidental activities that normally contribute hundreds of calories of expenditure per day are largely eliminated.
Studies conducted during the COVID-19 pandemic showed that daily step counts decreased by an average of 27-48% during lockdowns. This reduction in activity, combined with increased snacking and stress eating, contributed to average weight gains of 1.5-3 kg over quarantine periods in multiple international surveys.
Understanding your actual calorie expenditure while at home is the first step toward maintaining a healthy weight and energy balance during periods of reduced mobility.
MET Values Explained
MET (Metabolic Equivalent of Task) is a measure of the energy cost of physical activity. One MET represents the rate of energy expenditure at rest, approximately 3.5 mL of oxygen per kg of body weight per minute, or roughly 1 kcal/kg/hour.
| Activity | MET Value | Intensity |
|---|---|---|
| Sleeping | 0.9 | Below resting |
| Sitting / desk work | 1.3 | Sedentary |
| Cooking | 2.5 | Light |
| Cleaning (general household) | 3.3 | Light-Moderate |
| Walking (moderate pace) | 3.5 | Moderate |
| Home exercise (moderate) | 5.0 | Moderate-Vigorous |
| Resting (awake, lying/sitting quietly) | 1.0 | Resting |
Calorie Expenditure Formula
The remaining hours (those not covered by the listed activities) are assumed to be at a resting MET of 1.0 (sitting quietly, relaxing, light standing activities). The Basal Metabolic Rate (BMR) is estimated using the Mifflin-St Jeor equation:
Women: BMR = 10 × weight + 6.25 × height − 5 × age − 161
For simplicity in this calculator, height is estimated from weight using population averages where not directly provided. The BMR/kg value (approximately 1.0 kcal/kg/hr) is used for remaining idle hours.
Activity Calorie Comparison
Staying Active at Home
Maintaining physical activity during quarantine is crucial not only for weight management but also for mental health, immune function, and cardiovascular fitness. The WHO recommends at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity physical activity per week.
- Set a schedule: Block dedicated exercise time just as you would a meeting
- Break up sitting time: Stand or walk for 5 minutes every hour
- Take virtual fitness classes: Many gyms and instructors offer online sessions
- Use household items: Water bottles, backpacks with books, and resistance bands are effective substitutes for gym equipment
- Track your steps: Even indoors, aim for at least 5,000-7,000 steps per day
- Do active chores: Vigorous cleaning, gardening, and cooking all burn meaningful calories
Home Workout Ideas
These bodyweight exercises require no equipment and can be done in a small space:
| Exercise | MET Value | Calories/30 min (70 kg) | Muscles Targeted |
|---|---|---|---|
| Bodyweight squats | 5.0 | 175 | Quads, glutes, hamstrings |
| Push-ups | 3.8 | 133 | Chest, triceps, shoulders |
| Burpees | 8.0 | 280 | Full body |
| Yoga / stretching | 2.5 | 88 | Flexibility, core |
| Dancing | 5.5 | 193 | Full body, cardio |
| Jumping jacks | 7.0 | 245 | Full body, cardio |
| Planks | 3.5 | 123 | Core, shoulders |
| Stair climbing | 8.8 | 308 | Legs, cardio |
Weight Management During Isolation
Weight gain during quarantine is common and largely due to the combination of reduced activity and unchanged (or increased) calorie intake. Here are evidence-based strategies:
- Monitor your intake: Use a food diary or app to track daily calories. Most people underestimate intake by 20-40%.
- Adjust portions: If your activity level has dropped, you likely need 300-500 fewer calories per day to maintain weight.
- Prioritize protein: Protein increases satiety and helps preserve muscle mass. Aim for 1.2-1.6 g/kg body weight.
- Limit processed snacks: Keep tempting foods out of easy reach. Stock up on fruits, vegetables, and nuts.
- Stay hydrated: Thirst is often confused with hunger. Drink at least 2 liters of water daily.
- Manage stress: Stress and boredom eating are major contributors to quarantine weight gain. Practice mindfulness, meditation, or journaling.
- Maintain sleep hygiene: Poor sleep disrupts hunger hormones (ghrelin and leptin), increasing appetite.
Worked Example
A 70 kg, 30-year-old male during quarantine with: 30 min walking, 20 min exercise, 45 min cooking, 30 min cleaning, 8 hours sitting, 8 hours sleeping.
Exercise: 5.0 × 70 × 0.33 = 117 kcal
Cooking: 2.5 × 70 × 0.75 = 131 kcal
Cleaning: 3.3 × 70 × 0.50 = 116 kcal
Sitting: 1.3 × 70 × 8.0 = 728 kcal
Sleeping: 0.9 × 70 × 8.0 = 504 kcal
Remaining (4.92 hrs): 1.0 × 70 × 4.92 = 344 kcal
Total = 2,063 kcal/day
Compare this to the pre-quarantine estimate for a moderately active male: ~2,500 kcal/day. The ~440 kcal deficit means that without adjusting intake, this person would need to eat ~440 fewer calories than before to avoid weight gain.
Frequently Asked Questions
How accurate is this calculator?
This calculator provides a reasonable estimate based on published MET values from the Compendium of Physical Activities. Individual variation exists based on fitness level, body composition, movement intensity, and metabolic rate. The estimates are typically accurate within +/- 15%.
How many calories should I eat during quarantine?
To maintain your current weight, aim to match your calorie intake to the total daily expenditure calculated above. To lose weight gradually, create a moderate deficit of 250-500 kcal/day, which corresponds to approximately 0.25-0.5 kg of weight loss per week.
Can I gain muscle while in quarantine?
Yes. Bodyweight exercises, resistance band training, and improvised weights can maintain or even build muscle. Key factors are progressive overload (increasing difficulty over time), adequate protein intake (1.6-2.2 g/kg), and consistency.
Does standing while working burn significantly more calories?
Standing burns approximately 0.15-0.3 kcal/min more than sitting. Over an 8-hour workday, a standing desk might burn an additional 70-150 calories. While modest, this difference can prevent ~3-7 kg of weight gain per year if sustained.