Calories Burned Holding a Plank

A 155 lb (70 kg) person holding a plank for 30 minutes burns approximately 123 kcal, based on the standard MET formula and a MET value of 3.5 assigned to isometric bodyweight exercise (Compendium of Physical Activities).

That number is modest compared to running, but planks deliver something most calorie-burn comparisons miss: sustained muscle activation without joint loading and a meaningful contribution to your overall energy expenditure when practiced consistently.

Calories Burned by Weight and Duration

The table below uses the formula Calories = MET x weight (kg) x time (hours), with MET = 3.5 for planking (Compendium of Physical Activities, Ainsworth et al.).

Duration	125 lb (57 kg)	155 lb (70 kg)	185 lb (84 kg)
15 min	50 kcal	62 kcal	73 kcal
30 min	99 kcal	123 kcal	147 kcal
45 min	149 kcal	185 kcal	220 kcal
60 min	199 kcal	246 kcal	294 kcal

Note: These figures assume continuous holding. Most people accumulate plank time in shorter intervals (30–60 seconds per set), so real-session totals are typically 20–50% of the values above once rest time is included.

What Changes the Number

Body weight is the biggest lever. Because the MET formula multiplies mass directly, a heavier person always burns more calories performing the same exercise at the same relative intensity.

Plank variation affects effort level. A standard forearm plank is relatively stable; a plank with alternating arm or leg lifts increases muscle recruitment and shifts the effective MET upward, meaning your actual burn could run 10–20% higher than the table values.

Fitness level plays a role too. A beginner engaging stabilizer muscles for the first time may experience higher heart rate and oxygen consumption than an experienced athlete holding the same position. Over time, as your core adapts, the metabolic cost per second of planking tends to fall — which is one reason progressive overload (longer holds, harder variations) matters.

Form and stillness also matter. Sagging hips or a raised backside reduce core engagement, effectively lowering the actual MET and the calorie burn.

How to Actually Track It

The MET-based table is a useful starting point, but it is an average, not a measurement. Three approaches give you a sharper number:

1. Heart rate monitor — A chest strap or wrist optical sensor during your set gives a real-time proxy for oxygen consumption. Most fitness wearables apply an exercise-specific formula that is more accurate than a generic step count.

2. Calorie burn calculator — Plug your weight, activity, and duration into our calories burned calculator for an instant MET-based estimate without the manual math.

3. Track within your total daily burn — Planking earns its place as part of a structured strength session. Use your TDEE calculator to understand how exercise minutes fit into your overall energy budget, then log each session so trends compound over weeks.

For a deeper look at how exercise calorie estimates compare to lab measurements, see most accurate calorie burn methods.

Putting It in Context

A 30-minute plank session at 155 lb burns roughly the same calories as a 12-minute easy jog. That is not a reason to avoid planking — it is a reason to use it for what it does best: building the core stability that makes every other movement more efficient and injury-resistant.

Combine consistent planking with accurate food logging and you get the full picture: output from exercise, input from meals, and a running calorie balance you can actually act on.

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After your plank session, photograph your post-workout meal and let CalEye log the calories in seconds — no manual entry needed.