Exercise Calorie Burn Calculator

This calculator estimates kilocalorie expenditure during physical activity using the standard Metabolic Equivalent of Task (MET) method. Enter a body weight, activity duration in minutes, and select an activity preset to populate the reference MET value. The formula applied is Calories = MET × weight(kg) × duration(hours), as documented in the 2011 Compendium of Physical Activities (Ainsworth et al). Select from running, swimming, cycling, strength, or home activity categories below, or enter a custom MET value directly. Results are mathematical estimates based on population-averaged reference data.

MET Reference Table: 20+ Common Activities

The table below presents MET values for approximately 20 additional common activities drawn from the 2011 Compendium of Physical Activities classification system. These are reference values; individual variation in energy expenditure is documented in the original publication.

Science and Methodology of MET-Based Calorie Calculation

The MET Definition and Origin

Metabolic Equivalent of Task (MET) is a standardized unit for expressing the energy cost of physical activities relative to the resting metabolic rate. By definition, 1 MET equals the rate of energy expenditure at quiet sitting rest, and is convention-bound to 3.5 mL of oxygen consumed per kilogram of body weight per minute (mL·kg⁻¹·min⁻¹). This definition was formalized in early exercise physiology literature and has been maintained across successive editions of the Compendium of Physical Activities. Because oxygen consumption and kilocalorie expenditure have a well-documented stoichiometric relationship — approximately 4.825 kcal of energy released per liter of oxygen consumed — the MET value can be converted directly into a kilocalorie estimate using body weight and time as additional inputs.

The operational simplification commonly applied — and used in this calculator — approximates 1 MET as 1 kcal per kilogram of body weight per hour. This conversion slightly rounds the underlying indirect calorimetry constants for practical public-use calculators, introducing a documented small systematic offset. More precise conversions require multiplying the MET value by 3.5, dividing by 200, and multiplying by the duration in minutes to yield kcal (the 3.5/200 = 0.0175 factor), which produces numerically identical results to the MET×kg×hours formula when 1 MET is treated as 1.05 kcal/kg/hour rather than 1.0. Both conventions appear in the literature.

The Compendium of Physical Activities as a Data Source

The Compendium of Physical Activities is the primary reference source for standardized MET values in the epidemiological and public health literature. Originally published in 1993 by Ainsworth and colleagues, the Compendium was updated in 2000 and again in 2011; the 2011 edition assigns five-digit intensity codes to over 600 distinct activities and provides multiple sub-codes within categories to reflect intensity gradients. The 2011 update incorporated newer indirect calorimetry studies that were not available for earlier editions, including data on resistance training modalities and home activities. The Compendium is maintained and hosted by the Arizona State University Prevention Research Center, and the complete dataset is publicly accessible via the NIH National Library of Medicine catalog.

MET values in the Compendium are derived from three primary data sources. First, direct indirect calorimetry studies using Douglas bags, metabolic carts, or portable spirometry systems provide gold-standard measurements of VO₂ uptake during specific tasks. Second, doubly labeled water studies provide free-living validation data over multi-day periods. Third, when direct empirical data is unavailable, the Compendium assigns estimates based on expert consensus extrapolation from analogous activities with similar mechanical and physiological demands. The Compendium documentation explicitly flags which values are directly measured versus expert-estimated.

MET Intensity Ranges and Population Conventions

Public health agencies including the CDC, WHO, and ACSM conventionally partition MET values into three intensity categories. Light intensity activities are defined as 1.6 to 2.9 METs and include behaviors such as slow walking, desk work, and light household tasks. Moderate intensity activities span 3.0 to 5.9 METs and include brisk walking, cycling at casual pace, and general gardening. Vigorous intensity activities are classified as 6.0 METs and above, encompassing running, high-speed cycling, competitive sports, and heavy resistance training. These category boundaries are convention-based cutoff points; the underlying physiological response continuum is continuous. For classification purposes, the 3.0 MET threshold for moderate intensity was originally calibrated against the oxygen uptake observed during a standardized 3-mile-per-hour level walking task in a reference adult sample.

Within the Compendium, many activity entries include multiple MET subcodes corresponding to different conditions. Running, for example, is separately coded by pace: a 9-minute-per-mile (5.6 min/km) pace receives 9.8 METs, while a 5-minute-per-mile (3.1 min/km) sprint receives 16.0 METs. Cycling entries are subdivided by speed in miles per hour, with 6.8 METs at 10-12 mph and 10.0 METs at 16-19 mph. Swimming entries vary by stroke type and effort level, with breaststroke separately quantified from front crawl. Selecting the subcode that most closely matches observed conditions is necessary for reasonable estimate accuracy.

Formula Derivation and Worked Example

The core formula used by this calculator is:

Calories = MET × Weight(kg) × Duration(hours)

A worked calculation example: a 70 kg individual jogging for 30 minutes using the jogging MET preset of 7.0. First, convert duration to hours: 30 minutes ÷ 60 = 0.5 hours. Substitute into the formula: 7.0 × 70 × 0.5 = 245 total kcal. Expressed using the per-minute rate, the same result arises from (7.0 × 3.5 mL/kg/min ÷ 200) × 70 kg × 30 min = 257.25 kcal using the stricter calorimetric convention. The difference between the two conventions (245 vs 257 kcal) is approximately 5%, illustrating the rounding offset discussed previously. Both values appear in published references depending on the convention chosen.

Documented Misconceptions About MET Calculations

Several common misconceptions about MET-based calorie estimation are documented in the exercise physiology literature. First, MET values are population averages and do not adjust for individual differences in body composition. A 70 kg individual with a high lean mass fraction and a 70 kg individual with a higher fat mass will exhibit different oxygen consumption patterns during the same activity, but the MET formula treats both identically because it uses total body weight rather than lean mass. Second, MET values assume steady-state exercise; intermittent, stop-start activities or intervals introduce transient non-steady-state oxygen kinetics that are not captured by a single MET multiplier. Third, environmental factors including ambient temperature, humidity, altitude, and wind resistance affect actual energy expenditure independently of the MET value, and no standard correction factors are published in the Compendium for these variables. Fourth, skill level and movement economy materially alter caloric cost — an accomplished runner versus a novice runner at the same speed will exhibit different VO₂ values, and again no standard correction exists in the MET framework.

A fifth documented limitation is that the 1 MET baseline of 3.5 mL·kg⁻¹·min⁻¹ was calibrated against a historical reference sample and does not perfectly apply to all age groups and populations. Elderly individuals, adolescents, and certain clinical populations may have resting metabolic rates that differ from the 3.5 mL/kg/min reference, introducing a small systematic shift into any calculation that uses the standard convention. A 2005 study by Byrne et al. in the International Journal of Obesity documented that measured resting MET equivalents deviated by approximately -0.2 to +0.4 METs from the conventional 3.5 baseline across age and BMI strata.