How to calculate weekly activity
Moderate-equivalent minutes = moderate minutes + 2 × vigorous minutes Minutes to reference = max(0, 150 − moderate-equivalent minutes) Strength-day reference = at least 2 days per week
Worked example. Moderate-equivalent minutes: 150 / week.
Example inputs — Moderate minutes / week: 90; Vigorous minutes / week: 30; Strength days / week: 2. Starting values are illustrative.
General adult reference: at least 150 moderate-equivalent minutes plus muscle-strengthening on at least 2 days, covering all major muscle groups. Not an exercise clearance.
From George Guju, founder of Calculyn · Educational calculator guidance, not professional advice.
How it works
CDC adult guidance uses at least 150 minutes of moderate-intensity aerobic activity, 75 minutes of vigorous activity, or an equivalent combination each week, plus muscle-strengthening activity on two or more days covering all major muscle groups. This tool counts one vigorous minute as two moderate-equivalent minutes. Moderate effort generally allows talking but not singing; vigorous effort allows only a few words before pausing for breath. Count each aerobic minute once. Short sessions can contribute, which can make walking breaks and brief workouts practical around family schedules. The strength result checks days only, not whether the sessions covered the required muscles or were appropriate for you.
Sources
Assumptions & limitations
- General adult CDC activity reference, not individualized medical guidance.
- User classifies intensity; no heart-rate or effort measurement.
- Strength-day count does not verify muscle coverage, technique or recovery.
Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators
Frequently asked questions
Do short walks count toward weekly activity?
Yes, short bouts can contribute when the intensity is moderate or vigorous. Some movement is better than none; the calculator does not require ten-minute blocks.
Does lifting count as vigorous aerobic exercise automatically?
No. Strength days are checked separately. Do not classify every lifting minute as vigorous cardio simply because the weight feels hard.
Does meeting the number mean my exercise is safe?
No. These are general population guidelines, not medical clearance. Adapt activity to your abilities and seek qualified advice for conditions or concerning symptoms.