Rex says
Same equations the textbooks use — just way less awkward. Pop in your stats and I'll tell you what the number actually means for you.
Try a scenario
Click to load — tweak from there.Inputs
Result
Calories burned per session
613
Weekly burn
2450
Monthly burn
10647
Pounds of fat equivalent per month
3.04
Calories per minute
13.6
MET value used
9.8
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter body weight (lb).
- 2Enter activity.
- 3Enter duration (min).
- 4Enter sessions per week.
- 5Read your calories burned per session on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
MET values express activity intensity relative to sitting still. Multiplying MET by weight and duration gives a solid estimate without a heart rate strap.
Worked example
Using the values the calculator loads with:
Inputs
- Body weight: 175 lb
- Activity: Running 6 mph (9.8 MET)
- Duration: 45 min
- Sessions per week: 4
Results
- Calories burned per session: 613
- Weekly burn: 2,450
- Monthly burn: 10,647
- Pounds of fat equivalent per month: 3.04
- Calories per minute: 13.6
- MET value used: 9.8
What each field means
Inputs
- Body weight (lb)
- The body weight used in the calculation, measured in lb. Starts at 175 lb so you have a working example on load. Accepted range: 60–500 lb.
- Activity
- Pick the option that matches your situation — the maths changes per option. Choices: Walking 3 mph (3.5 MET), Brisk walking 4 mph (5 MET), Running 6 mph (9.8 MET), Running 8 mph (13.5 MET), Cycling 14 mph (10 MET), Swimming laps (8 MET), Weight training (5 MET), HIIT (11 MET), Yoga (3 MET), Hiking (6 MET).
- Duration (min)
- The duration used in the calculation, measured in min. Starts at 45 min so you have a working example on load. Accepted range: 1–600 min.
- Sessions per week
- The sessions per week used in the calculation. Starts at 4 so you have a working example on load. Accepted range: 1–21.
Results
- Calories burned per session
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Weekly burn
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Monthly burn
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Pounds of fat equivalent per month
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Calories per minute
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- MET value used
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the calories burned by activity calculator work?
MET values express activity intensity relative to sitting still. Multiplying MET by weight and duration gives a solid estimate without a heart rate strap. The underlying maths is: Calories = MET × 3.5 × weight(kg) ÷ 200 × minutes.
What do I need to enter?
4 values: body weight, activity, duration, and sessions per week. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the calories burned per session result mean?
It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.
Who is this tool for?
It's built for anyone tracking a health or training target and wanting the standard formula applied correctly, without a signup or an app.
Accuracy and limitations
- Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.
- Results do not account for medical conditions, medication, or pregnancy.
- Use this as a directional reference, not a diagnosis — talk to a clinician before acting on it.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Calories Burned Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/calories-burned-running
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/calories-burned-running" target="_blank" rel="noopener">Calories Burned Calculator — RevenueLab</a> (2026).</p>
Source: [Calories Burned Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/calories-burned-running) (2026).