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Calories Burned Calculator

Estimates the calories burned during an activity from body weight, duration and the activity's MET value from the 2011 Compendium of Physical Activities, using the ACSM metabolic equation kcal/min = MET × 3.5 × kg / 200.

Weight (kg)Body weight in kilograms. Duration (min)Duration of the activity in minutes. ActivityActivity and intensity; each maps to a MET value from the 2011 Compendium of Physical Activities.

When to use

You need an estimate of energy expenditure for a workout, sport or chore of known duration for a person of known weight.

Do not use when: You need total daily calorie needs (use tdee) or resting expenditure (use bmr); MET values are population averages and ignore fitness level, terrain and intensity within a category.

Formula

kcal_per_minute = MET × 3.5 × weight_kg / 200; calories_kcal = kcal_per_minute × duration_minutes

3.5 ml O2/kg/min is the resting oxygen uptake of 1 MET and 1 litre of O2 corresponds to about 5 kcal, giving kcal/min = MET × 3.5 × kg / 200. Net calories above rest are roughly (MET − 1) / MET of the gross value.

Inputs

Parameter	Type	Unit	Required	Description
`weight_kg`	number	kg	yes	Body weight in kilograms. Range: > 0, ≤ 700
`duration_minutes`	number	min	yes	Duration of the activity in minutes. Range: > 0, ≤ 1440
`activity`	enum: walking_3_5_mph \| running_6_mph \| running_8_mph \| cycling_moderate \| swimming_laps_moderate \| weight_training \| yoga \| hiking \| jump_rope \| rowing_moderate \| elliptical \| basketball \| soccer \| tennis \| dancing \| housework		yes	Activity and intensity; each maps to a MET value from the 2011 Compendium of Physical Activities.

Outputs

Output	Type	Unit	Description
`calories_kcal`	number	kcal	Gross energy expenditure for the session (includes resting metabolism during that time).
`kcal_per_minute`	number	kcal/min	Energy expenditure per minute.
`kcal_per_hour`	number	kcal/h	Energy expenditure per hour of the activity.
`met`	number	MET	Metabolic equivalent of the activity (1 MET = 3.5 ml O2/kg/min, resting).
`activity_label`	string		Activity description used, with its MET value.

Example

70 kg, running 6 mph, 30 min: {"weight_kg":70,"duration_minutes":30,"activity":"running_6_mph"} → {"calories_kcal":360,"kcal_per_minute":12.01,"kcal_per_hour":720,"met":9.8}

65 kg, walking 3.5 mph, 60 min: {"weight_kg":65,"duration_minutes":60,"activity":"walking_3_5_mph"} → {"calories_kcal":293,"kcal_per_minute":4.89,"met":4.3}

GET https://tttkmbb.com/api/v1/calculate/calories-burned?weight_kg=70&duration_minutes=30&activity=running_6_mph

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/calories-burned (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/calories-burned · Markdown: https://tttkmbb.com/fitness/calories-burned.md · JSON definition: https://tttkmbb.com/fitness/calories-burned.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="calories-burned"
OpenAPI operationId: estimate_calories_burned
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

FAQ

Are these gross or net calories?

Gross: they include the calories you would have burned resting during the same time (about 1 MET). Subtract weight_kg × duration_minutes / 60 for the net exercise cost.

Why does the same run burn a different number on my watch?

Devices add heart rate, speed and personal data; MET tables are averages for a standard 70 kg adult, so ±20 % differences are normal.

Related calculators

TDEE Calculator — Daily calorie needs including all activity.
BMR Calculator — Resting energy expenditure that the gross figure includes.
Steps to Distance Calculator — Turn a step count into a walking distance first.