4 METs of Activity Calculator: Know Your Effort

This calculator estimates the metabolic equivalent of task (MET) value for four common activities based on your effort level, and it also shows how many calories you burn per minute. You enter the activity and your intensity, and it returns the MET value and calories per minute. It’s for anyone who wants a quick, standardized way to compare exercise intensity without a lab test.

Formula

The MET value is a multiple of your resting metabolic rate. One MET equals 1 kcal/kg/hour, which is roughly the energy you burn sitting still. The formula used here is:

MET = baseMET × (0.5 + effort/10)

Where:

• baseMET = the typical MET for that activity at moderate effort (walking 3.5, running 7.0, cycling 4.0, swimming 6.0)
• effort = your perceived exertion on a 1–10 scale (1 = very light, 10 = maximal)

Then, to get calories burned per minute:

Calories/min = MET × 3.5 × weight(kg) / 200

The 3.5 represents mL of oxygen per kg per minute for 1 MET, and 200 converts to kcal/min.

Worked Example

Using the defaults: walking (baseMET=3.5), weight=70 kg, effort=5.

Step 1: MET = 3.5 × (0.5 + 5/10) = 3.5 × (0.5 + 0.5) = 3.5 × 1.0 = 3.5

Step 2: Calories/min = 3.5 × 3.5 × 70 / 200 = 857.5 / 200 = 4.2875 ≈ 4.3 kcal/min

So a 70 kg person walking at a moderate effort (5/10) burns about 4.3 kcal per minute. That matches the calculator’s output.

When to Use This Calculator

Use this tool when you want a quick estimate of how many calories you burn during a workout, or when you want to compare the intensity of different activities. It’s especially useful for planning exercise sessions, tracking daily energy expenditure, or just satisfying curiosity about how hard you’re working.

Remember that the MET value is a relative measure—it tells you how many times harder you’re working than at rest. A MET of 5 means you’re burning five times the energy you would at rest. This is a standard way to express exercise intensity in health and fitness contexts.

Common Mistakes & Limitations

A frequent mistake is confusing effort level with MET value. Effort is subjective (your perceived exertion), while MET is an objective measure. This calculator uses your effort to adjust the base MET, but the result is still an estimate. Another mistake is using the wrong base MET for your activity—for example, using running’s base MET for a brisk walk. Also, be careful with units: weight must be in kilograms, not pounds. If you weigh in pounds, divide by 2.2 first.

The formula is a simplified model. Real MET values vary with fitness, terrain, temperature, and equipment. For precise measurements, you’d need a metabolic cart or a heart rate monitor. But for general fitness tracking, this estimate is accurate enough.

How to Choose

When picking between these four activities, consider your goals and preferences. Walking is low-impact and easy to sustain, making it great for beginners or recovery days. Running gives a higher base MET, so you burn more calories per minute, but it’s harder on the joints. Cycling is also low-impact and can be done indoors or outdoors, with a moderate MET. Swimming is a full-body workout that’s gentle on the body, but it requires access to a pool and some skill.

Also think about your effort level. If you’re only willing to exercise at a 3/10 effort, you’ll burn fewer calories than someone doing the same activity at 7/10. Choose an activity you can do consistently and at an effort that challenges you but is sustainable.

Frequently Asked Questions

What does MET stand for?

MET stands for Metabolic Equivalent of Task. It’s a unit that measures the energy cost of physical activities, with 1 MET being the energy burned at rest.

How accurate is this calculator?

It’s a reasonable estimate based on standard MET values and a simple effort adjustment. Real values can vary by ±20% depending on individual factors, but it’s fine for general use.

Can I use this for weight loss planning?

Yes, but remember that weight loss depends on total calorie balance. Use the calories per minute to estimate workout burn, but also consider your diet and other daily activities.

What if I weigh in pounds?

Convert pounds to kilograms by dividing by 2.2. For example, 150 lbs ÷ 2.2 = 68.2 kg. Enter that in the weight field.

Why does effort level go to 10?

The 1–10 scale is a common rating of perceived exertion (RPE). A 10 means maximal effort, like a sprint. This scale is used because it’s easy to understand and correlates well with actual intensity.

Can I use this for other activities?

You can approximate other activities by choosing the closest base MET. For example, yoga might be around 2.5, but that’s not in the list. You’d have to adjust manually.

Final Thoughts

This calculator gives you a quick, standardized way to estimate the intensity and calorie burn of four common activities. It’s not a substitute for medical advice, but it’s a handy tool for fitness enthusiasts and anyone curious about their energy expenditure. Use it to compare activities, plan workouts, or just see how much effort you’re really putting in.

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in t | Activity | - | Walking=3.5, Running=7.0, Cycling=4.0, Swimming=6.0 | 0
in w | Your weight | kg | 70 | 0
in e | Effort level (1-10) | - | 5 | 1
out met | MET value | - | t * (0.5 + e/10) | 1
out cal | Calories per minute | kcal/min | met * 3.5 * w / 200 | 1