Estimate calories and kilojoules burned during a typical workday at a desk job — seated desk work, standing at a standing desk, or walking on a treadmill desk — based on your body weight and hours worked. Office work is often thought of as "not exercise", but it still has a measurable energy cost, and how that cost is calculated below uses verified MET values from the 2024 Adult Compendium of Physical Activities, the standard reference researchers and clinicians use for the energy cost of everyday activities.
Desk-job calorie burn depends on how you work, captured here as three tiers: seated desk work (MET 1.5), standing at a standing desk (MET 1.8), and walking on a treadmill desk at a slow pace (MET 2.8). The formula is calories = MET × body weight (kg) × duration (hours). A 70 kg person working an 8-hour day burns 840 kcal (about 3,515 kJ) seated, 1,008 kcal (about 4,217 kJ) standing, and 1,568 kcal (about 6,561 kJ) on a treadmill desk — nearly double the seated figure once you're walking rather than sitting still.
| Work Type | MET | Calories | Kilojoules |
|---|
The calculation uses a MET (Metabolic Equivalent of Task) value for how you work, your body weight, and the number of hours worked. This calculator uses three MET tiers taken directly from the 2024 Adult Compendium of Physical Activities — seated desk work (code 11580, "sitting tasks, light effort (e.g., office work, chemistry lab work, light assembly repair, watch repair, reading, desk work)", MET 1.5), standing at a standing desk (code 11600, "standing tasks, light effort (e.g., bartending, store clerk, standing and talking at work)", MET 1.8 — this is the Compendium's general standing-task, light-effort code, applied here to standing-desk use), and walking on a treadmill desk (code 11004, "active workstation, treadmill desk, walking 1.0 – 2.0 mph", MET 2.8). None of these three codes are flagged as estimated in the Compendium — all three are literature-supported entries.
| Work Type | MET | Calories (70 kg, 8 hours) | Kilojoules |
|---|---|---|---|
| Seated desk work | 1.5 | 840 kcal | 3,515 kJ |
| Standing at a standing desk | 1.8 | 1,008 kcal | 4,217 kJ |
| Walking on a treadmill desk | 2.8 | 1,568 kcal | 6,561 kJ |
Not all desk jobs involve the same physical posture, which is exactly why this calculator uses three separate tiers rather than a single number. Seated desk work covers general office tasks done sitting down — typing, reading, meetings, phone calls, light paperwork — all classed as light-effort sitting tasks with a low MET value of 1.5. Standing at a standing desk steps up slightly to MET 1.8, reflecting the postural muscle activity involved in staying upright rather than any large jump in movement — it uses the Compendium's general standing-task, light-effort code, since a dedicated "standing desk" entry doesn't exist separately in the Compendium. Walking on a treadmill desk is the most active tier at MET 2.8, reflecting genuine continuous walking at a slow pace (1.0–2.0 mph) while working, which is why it burns noticeably more than either of the other two tiers.
Seated desk work, at MET 1.5, sits within the range generally classed as sedentary behaviour — sitting or lying activities with very low energy expenditure. Standing at a desk, at MET 1.8, moves just outside that sedentary threshold into very light activity, while a treadmill desk, at MET 2.8, is a distinctly more active way of working. In practical terms, a job spent mostly seated at a desk is one of the more sedentary ways to spend a working day, which is part of why standing desks and treadmill desks have grown in popularity as alternatives. General population physical activity and sedentary behaviour guidelines are published by the Australian Government Department of Health and by the World Health Organization — this calculator provides a general estimate of energy expenditure only, not personalised health advice.
The table below holds work type constant at the standing desk tier (MET 1.8) for a full 8-hour workday, so you can see how much body weight alone changes the total.
| Body Weight | MET | Calories (8 hours) | Kilojoules |
|---|---|---|---|
| 55 kg | 1.8 | 792 kcal | 3,314 kJ |
| 65 kg | 1.8 | 936 kcal | 3,916 kJ |
| 70 kg | 1.8 | 1,008 kcal | 4,217 kJ |
| 75 kg | 1.8 | 1,080 kcal | 4,519 kJ |
| 85 kg | 1.8 | 1,224 kcal | 5,121 kJ |
| 95 kg | 1.8 | 1,368 kcal | 5,724 kJ |
Here body weight is fixed at 70 kg while both hours worked and work type change, so you can compare how much a more active tier and a longer workday each add to the total.
| Hours Worked | Seated (MET 1.5) | Standing (MET 1.8) | Treadmill (MET 2.8) |
|---|---|---|---|
| 4 hours | 420 kcal / 1,757 kJ | 504 kcal / 2,109 kJ | 784 kcal / 3,280 kJ |
| 8 hours | 840 kcal / 3,515 kJ | 1,008 kcal / 4,217 kJ | 1,568 kcal / 6,561 kJ |
| 10 hours | 1,050 kcal / 4,393 kJ | 1,260 kcal / 5,272 kJ | 1,960 kcal / 8,201 kJ |
Australian nutrition panels list energy in kilojoules, not calories, so it's worth converting your workday total into the same unit your food packaging uses. Multiply your calorie figure by 4.184 to get kilojoules. A 70 kg person doing seated desk work for a full 8-hour day burns about 840 kcal, which is roughly 3,515 kJ — a useful figure to weigh up against the energy value printed on lunch or an afternoon snack.
How many calories does sitting at a desk burn?
Seated desk work has a MET value of 1.5, which is a very light level of activity. Using calories = MET × body weight (kg) × duration (hours), a 70 kg person sitting at a desk for a full 8-hour workday burns around 840 kcal (about 3,515 kJ), which works out to roughly 105 kcal an hour. Because it's such a low MET value, most of that energy is simply your body's baseline metabolic cost of being awake and upright, not from any deliberate movement.
Does a standing desk actually help you burn more calories?
Yes, though the difference is modest. Standing at a standing desk carries a MET value of 1.8 versus 1.5 for sitting, so for the same 70 kg person over an 8-hour day, standing burns around 1,008 kcal (4,217 kJ) compared with 840 kcal (3,515 kJ) seated — an extra 168 kcal, or about 20% more, across the full day. That's a real but modest gain, and it comes mainly from the postural muscle activity involved in staying upright rather than from any large jump in intensity.
How many calories does a treadmill desk burn?
A treadmill desk used at a slow walking pace (1.0–2.0 mph) has a MET value of 2.8, noticeably higher than either sitting (1.5) or standing (1.8). For a 70 kg person over an 8-hour workday, that works out to around 1,568 kcal (6,561 kJ) — nearly double the 840 kcal burned sitting for the same duration, and considerably more than the 1,008 kcal burned using a standing desk.
Is office work sedentary?
Seated desk work, at MET 1.5, falls within the range generally classed as sedentary behaviour (sitting or lying activities with very low energy expenditure). Standing at a desk, at MET 1.8, moves just outside that sedentary threshold into very light activity, and using a treadmill desk, at MET 2.8, is a distinctly more active way of working. In practical terms, a job spent mostly seated at a desk is one of the more sedentary ways to spend a working day, which is part of why standing desks and treadmill desks have become popular alternatives.
How can I burn more calories at a desk job?
The calculator above shows the three main options in order of intensity: switching from sitting to standing adds a modest amount of extra energy expenditure, and switching to a treadmill desk adds considerably more. Beyond changing your workstation itself, taking short walking breaks, using stairs instead of a lift, standing during phone calls, and getting up regularly to move around the office all add incidental activity on top of whichever desk setup you use, and none of them require replacing your furniture.
Does typing burn calories?
Typing and other seated desk tasks are captured within the general seated desk work MET value of 1.5 used in this calculator — the Compendium doesn't break typing out as a separate, higher-intensity activity from other light seated office tasks. In practice, the calorie difference between typing and simply sitting at a desk without typing is negligible; what matters far more for total energy expenditure is whether you're sitting, standing, or walking while you work, not the specific hand movements involved.
How many calories do I burn in an 8-hour workday at a desk?
It depends on your workstation setup and body weight. Using the formula calories = MET × body weight (kg) × duration (hours), a 70 kg person burns around 840 kcal (3,515 kJ) across an 8-hour day of seated desk work, around 1,008 kcal (4,217 kJ) using a standing desk for the same 8 hours, and around 1,568 kcal (6,561 kJ) using a treadmill desk for the same 8 hours. Enter your own body weight and hours worked into the calculator above for a personalised figure.
Should I switch to a standing desk to lose weight?
A standing desk alone burns modestly more energy than sitting — around 168 extra kcal across an 8-hour day for a 70 kg person, based on the MET values used here — which is a genuine but relatively small contribution to weight management compared with diet or structured exercise. A treadmill desk burns considerably more, but isn't practical for every task or every office. This calculator gives a general estimate of energy expenditure only; for personalised weight management advice, speak with a healthcare professional or accredited dietitian.