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Deep Work Hours Calculator

Enter your weekly hours to estimate available deep-work time.

How it is calculated

The tool first removes committed time from the week: raw focus = work hours − meeting hours − admin hours. It then applies your focus efficiency: deep work = raw focus × focus% ÷ 100. Finally per day = deep work ÷ 5, which assumes a five-day working week.

All hours are per week. Focus efficiency is a percentage from 0 to 100 and is your own estimate of how much of the remaining time is truly undistracted. If meetings plus admin exceed your total hours, raw focus is floored at 0 rather than going negative. Weekly work hours must be above zero, and meetings and admin cannot be negative, otherwise there is no result. Results are rounded to one decimal. The daily figure is a plain average over five days, not a schedule.

Worked example

You work 45 hours a week, spend 12 in meetings and 6 on admin, and judge that 70% of what is left is truly focused. Raw focus = 45 − 12 − 6 = 27.0 h. Deep work = 27 × 0.70 = 18.9 h per week. Spread over five days that is 18.9 ÷ 5 = 3.78, shown as 3.8 h/day. So a 45-hour week yields under 19 hours of real deep work. Cutting meetings from 12 to 8 hours raises raw focus to 31.0 h and deep work to 21.7 h, a gain of 2.8 hours.

Try this example →

Common mistakes

  • Entering the focus percentage as a fraction (0.7). The field is a percentage, so 0.7 means 0.7% and the result is close to zero.
  • Putting the same hours in both meetings and admin, such as email that is also counted as admin, so the time is subtracted twice.
  • Mixing monthly or daily hours into weekly fields. All inputs are hours per week.
  • Setting the focus efficiency at 100%. Even undisturbed time is rarely fully concentrated, so this overstates the deep work figure.
  • Entering more meeting and admin hours than total hours and expecting a negative number. Raw focus is floored at 0.0 h, so the deep-work result is 0.0 h.

About this calculator

In his book Deep Work, computer scientist Cal Newport argues that the ability to focus without distraction on cognitively demanding tasks is becoming both rarer and more valuable, and that most knowledge workers overestimate how many hours of it they actually produce in a week. Meetings, email, context-switching and administrative overhead eat into the raw hours on a calendar long before any deep thinking starts, and the work that remains is rarely performed at full mental efficiency.

This calculator starts from your total weekly working hours, subtracts time already committed to meetings and admin, and then applies a focus-efficiency factor to approximate how much of what is left is genuinely deep — the kind of single-task, low-interruption effort that produces writing, code, strategy and analysis rather than just activity. The result is a more honest weekly deep-work budget than “hours at my desk,” and a number worth tracking the same way athletes track training load.

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  • Editorial team

    Notice that a meeting hour costs you a full hour of deep work only if your focus percentage is 100; at 80% it costs 0.8 h. Going from 10 to 20 meeting hours in a 40-hour week with 5 admin hours drops deep work from 20.0 h to 12.0 h, per-day from 4.0 to 2.4. Try your own week twice, once as it is and once with your calendar trimmed. Which block would you cut first?

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