Estimate calories and kilojoules burned during circuit training — a timed, station-based workout format that combines resistance and cardio movements — across three effort tiers: light, moderate, and vigorous (including kettlebells, with minimal rest between stations). Figures are drawn from the Conditioning Exercise section of the 2024 Adult Compendium of Physical Activities. This calculator is distinct from MegaCalcOnline's HIIT Calorie Calculator and Kettlebell Calorie Calculator — circuit training here refers to the broader station-based, gym-class style format rather than a strict interval-training protocol or a kettlebell-only session, though the vigorous tier below does include kettlebell-based circuits.
Circuit training calorie burn depends on effort level, captured here as three tiers: light effort (MET 3.5), moderate effort (MET 5.0), and vigorous effort — including kettlebells, minimal rest (MET 7.5). The formula is calories = MET × body weight (kg) × duration (hours). A 70 kg person doing a 45-minute session burns 184 kcal (about 769 kJ) at light effort, 263 kcal (about 1,098 kJ) at moderate effort, and 394 kcal (about 1,647 kJ) at vigorous effort — the tier and pace you choose at each station make a real difference to the total.
| Effort Tier | MET | Calories | Kilojoules |
|---|
The calculation uses a MET (Metabolic Equivalent of Task) value for your chosen circuit training effort level, your body weight, and your session duration. This calculator uses three MET tiers taken directly from the Conditioning Exercise codes in the 2024 Adult Compendium of Physical Activities — light effort (code 02034, MET 3.5), moderate effort (code 02035, MET 5.0), and vigorous effort, including kettlebells with minimal rest between stations (code 02040, MET 7.5). None of these three codes are flagged as estimated in the Compendium — all three are literature-supported entries.
| Effort Tier | MET | Calories (70 kg, 45 min) | Kilojoules |
|---|---|---|---|
| Light effort | 3.5 | 184 kcal | 769 kJ |
| Moderate effort | 5.0 | 263 kcal | 1,098 kJ |
| Vigorous effort — including kettlebells, minimal rest | 7.5 | 394 kcal | 1,647 kJ |
Circuit training covers a wide range of physical effort, which is exactly why this calculator uses three separate tiers rather than a single number. Light effort circuits are typical of beginner-friendly gym classes — a steady rotation through stations with generous rest between each one, often focused on learning proper form on basic bodyweight and light-resistance movements rather than pushing pace. Moderate effort is the broadest tier, describing the pace of a typical group fitness circuit class: a mix of bodyweight, light-resistance and cardio stations moved through at a brisk, sustained pace with shorter rest breaks. Vigorous effort is the most demanding tier, describing circuits that incorporate kettlebell-based exercises — swings, cleans, squats and presses — performed with minimal rest between stations, keeping heart rate elevated for the whole session and driving a noticeably higher energy cost per minute than the other two tiers.
The table below holds the tier constant at moderate effort (MET 5.0) for a 45-minute session, so you can see how much body weight alone changes the total.
| Body Weight | MET | Calories (45 min) | Kilojoules |
|---|---|---|---|
| 55 kg | 5.0 | 206 kcal | 863 kJ |
| 60 kg | 5.0 | 225 kcal | 941 kJ |
| 65 kg | 5.0 | 244 kcal | 1,020 kJ |
| 75 kg | 5.0 | 281 kcal | 1,177 kJ |
| 80 kg | 5.0 | 300 kcal | 1,255 kJ |
| 90 kg | 5.0 | 338 kcal | 1,412 kJ |
Here body weight is fixed at 70 kg while both session length and effort tier change, so you can compare how much a longer class and a harder pace each add to the total.
| Session Length | Light Effort (MET 3.5) | Moderate Effort (MET 5.0) | Vigorous Effort (MET 7.5) |
|---|---|---|---|
| 15 minutes | 61 kcal / 256 kJ | 88 kcal / 366 kJ | 131 kcal / 549 kJ |
| 30 minutes | 123 kcal / 513 kJ | 175 kcal / 732 kJ | 263 kcal / 1,098 kJ |
| 45 minutes | 184 kcal / 769 kJ | 263 kcal / 1,098 kJ | 394 kcal / 1,647 kJ |
| 60 minutes | 245 kcal / 1,025 kJ | 350 kcal / 1,464 kJ | 525 kcal / 2,197 kJ |
Australian nutrition panels list energy in kilojoules, not calories, so it's worth converting your session total into the same unit your food packaging uses. Multiply your calorie figure by 4.184 to get kilojoules. A 70 kg person doing a 45-minute moderate-effort circuit burns about 263 kcal, which is roughly 1,098 kJ — a useful figure to weigh up against the energy value of a recovery snack or post-workout drink.
How many calories does circuit training burn?
It depends on your effort level and session length. Using this calculator's three tiers for a 70 kg person doing a 45-minute session: light effort (MET 3.5) burns about 184 kcal (769 kJ), moderate effort (MET 5.0) burns about 263 kcal (1,098 kJ), and vigorous effort — including kettlebells, minimal rest (MET 7.5) — burns about 394 kcal (1,647 kJ). Lighter or heavier people, and shorter or longer sessions, will see proportionally lower or higher totals, so enter your own weight and duration above for a personalised estimate.
Is circuit training cardio, strength training, or both?
Both. Circuit training moves participants through a series of timed stations that typically mix resistance exercises (such as squats, push-ups or kettlebell lifts) with cardio-style movements (such as jumping jacks or mountain climbers), performed back-to-back with limited rest. That combination of strength & cardio work in one format is exactly why circuit training MET values sit in a wide range — from a gentle, beginner-friendly pace at light effort up to a genuinely vigorous, heart-rate-elevating pace at the top tier.
How is this calculator different from the site's HIIT and Kettlebell calorie calculators?
Circuit training, HIIT (high-intensity interval training) and kettlebell training are related but distinct formats, so MegaCalcOnline models them separately. This calculator covers the broader station-based, gym-class style of circuit training captured in the Compendium's Conditioning Exercise codes, across three general effort tiers. The site's dedicated HIIT Calorie Calculator is built around short, structured work/rest interval protocols, while the Kettlebell Calorie Calculator is built around kettlebell-specific movements. This page's vigorous effort tier does include kettlebell-based circuits with minimal rest, but if your session is pure kettlebell work or a strict interval protocol, those dedicated calculators may better match your training.
What does the "vigorous effort" tier with kettlebells actually involve?
The vigorous effort tier (MET 7.5) reflects circuit training performed at a high, sustained intensity with minimal rest between stations, and the Compendium code behind it specifically references circuits that include kettlebell exercises. In practice, this looks like compound, often explosive movements — kettlebell swings, cleans, squats and presses — moved through quickly with little recovery time, keeping heart rate elevated for the whole session rather than only during isolated bursts.
Does body weight change how many calories circuit training burns?
Yes. Because calories equal MET multiplied by body weight in kilograms multiplied by duration in hours, body weight is a direct multiplier in the formula. At the moderate effort tier (MET 5.0) for a 45-minute session, a 90 kg person burns roughly 338 kcal compared with about 206 kcal for a 55 kg person completing the identical session at the identical effort level.
Are these MET values estimated, or based on real research?
All three MET values used in this calculator — 3.5 for light effort, 5.0 for moderate effort, and 7.5 for vigorous effort including kettlebells — come from the Conditioning Exercise section of the 2024 Adult Compendium of Physical Activities, and none of the three codes are flagged as estimated in that reference. That means all three are literature-supported entries, based on measured or published research data rather than an approximation.
How do I convert calories burned during circuit training into kilojoules?
Multiply the calorie figure by 4.184, the standard conversion between kilocalories and kilojoules used on Australian food labels. A 70 kg person doing a moderate-effort circuit for 45 minutes burns about 263 kcal, which converts to roughly 1,098 kJ — a useful number to compare against the energy value on a protein shake or recovery snack.
How is calories burned circuit training calculated?
The calculator multiplies a MET (Metabolic Equivalent of Task) value for your chosen effort tier by your body weight in kilograms and by your session duration in hours: calories = MET × body weight (kg) × duration (hours). The three MET values used — 3.5 for light effort, 5.0 for moderate effort, and 7.5 for vigorous effort including kettlebells with minimal rest — come directly from the 2024 Adult Compendium of Physical Activities. Since the calculator's duration field is entered in minutes, minutes are first converted to hours (minutes ÷ 60) before applying the formula. The result in kilocalories is then multiplied by 4.184 to give the equivalent figure in kilojoules, the unit used on Australian food labels.