How much daily activity the research links to offsetting the health risk of a lot of sitting. There is no formula that trades one sitting hour for so many active minutes, so this gives you the activity band the studies report, and tells you which bracket your day falls in.
How to read this
Add up work, commuting, meals and evenings. A rough total is fine. The studies below treated more than about 8 hours a day as high sitting.
Daily activity the research points to
Enter your sitting hours above
Why this number
The headline figure is from a 2020 harmonised meta-analysis of accelerometer data on 44,370 people: “About 30-40 min of MVPA per day attenuate the association between sedentary time and risk of death, which is lower than previous estimates from self-reported data.” MVPA means moderate-to-vigorous activity, the pace at which you can talk but not sing. An earlier 2016 analysis of self-reported activity put it higher, at “about 60-75 min per day”. The lower, device-measured band is the better current estimate.
Where your day sits
Enter your sitting hours above
Why this number
This just compares your number with the roughly 8-hour mark the studies used to define high sitting. It changes nothing about the activity figure above, which is a general target rather than something scaled to your exact hours.
What “offset” does and does not mean. These studies found that this much activity attenuates the statistical association between long sitting and death. That is not the same as cancelling out sitting, and it does not mean an active hour erases a sitting hour. The WHO puts the baseline plainly: “People who are insufficiently active have a 20% to 30% increased risk of death compared to people who are sufficiently active.” If you are starting from little activity, some is a large improvement on none.
Sources: Ekelund et al. 2020, accelerometer meta-analysis; Ekelund et al. 2016, self-report analysis; WHO physical activity fact sheet. Background: How Much Exercise to Offset Sitting All Day?
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Read this before you trust the number
The figure is a general research band, not a dose scaled to your exact hours. “Offset” means the activity attenuates a statistical association between long sitting and death, which is not the same as cancelling out the sitting itself. An active hour does not erase a sitting hour.
If you have a heart condition, joint problems, or you have been inactive for a long time, build up gradually and, if in doubt, check with a clinician before a big change. See the medical disclaimer.
Why there is no per-hour formula
A tool that multiplied your sitting hours by some number of active minutes would be inventing a finding. The studies do not work that way. They compared brackets of people, and reported a single activity band that attenuated the mortality risk seen in the high-sitting group. So this tool reports that band, and uses your hours only to say which bracket the research would place you in.
Why the figure dropped from the famous hour
The widely quoted “60 to 75 minutes a day” came from self-reported activity in 2016. When later work measured activity with accelerometers instead of questionnaires, the figure fell to about 30 to 40 minutes. Devices catch movement people forget to report, which is why the better-measured number is lower.
Common questions
Does exercise cancel out the harm of sitting?
Not exactly. Enough daily activity attenuates the statistical link between long sitting and mortality. That is worth having, but it is a softening of a risk association, not an erasing of the time spent sitting.
What counts as moderate-to-vigorous activity?
A pace at which you can talk but not sing: brisk walking, cycling, and similar. It does not have to be a workout, and it can be spread across the day.
I sit less than eight hours. Does this still apply?
The general activity target still applies. The eight-hour mark is only the line the studies used to define high sitting, so the tool notes which side of it your day falls on.