Productivity Time Calculator
How much of a working week is actually productive, and what the unproductive hours cost.
A working week is not a productive week. Meetings, interruptions, admin and switching between tasks take a share of every day, and the share is usually larger than the person experiencing it believes.
Enter your working hours and what takes time away from the work, and this calculator shows the productive hours, the cost of the lost time and what reclaiming part of it would give back.
At a glance
- What you enter
- Hours worked per week, Hours in meetings, Hours lost to interruptions, Hours of administration and reporting, Time lost to switching between tasks, What an hour of your work is worth, Share of the lost time you could reclaim, Working weeks per year
- What you get
- Productive hours per week, Productive share of the week, Lost hours per week, Cost of the lost time per year, Value reclaimed per year, Days of deep work per week
- Formula shown
- Yes - every step, right below your results.
- Cost and privacy
- Free, no account needed, and nothing you type is stored.
See worked examples ↓ Read the FAQ ↓ Share this calculator ↓
Results are estimates for general information only - always verify with a professional or official source before acting on them.
How to use the Productivity Time Calculator
- 1 Enter Hours worked per week (hours)
- 2 Enter Hours in meetings (hours)
- 3 Enter Hours lost to interruptions (hours) - Messages, people stopping by, urgent requests.
- 4 Enter Hours of administration and reporting (hours)
- 5 Enter Time lost to switching between tasks - Returning to a complex task after an interruption costs several minutes of refocusing, all day long.
- 6 Enter What an hour of your work is worth
- 7 Enter Share of the lost time you could reclaim
- 8 Enter Working weeks per year (weeks)
- 9 Press Calculate. You get Productive hours per week, Productive share of the week, Lost hours per week, Cost of the lost time per year, Value reclaimed per year, Days of deep work per week, and every intermediate step stays visible under “How is this calculated?”
- 10 Change one number at a time to see what moves the result - that is usually the most useful thing a calculator can tell you.
Worked examples
Real numbers run through this calculator. Open any example to load it into the form above and change it.
A 40 hour week losing 23.80 hours
Nine hours of meetings, four of interruptions, six of admin and 12% lost to switching between tasks.
You enter
- Hours worked per week
- 40 hours
- Hours in meetings
- 9 hours
- Hours lost to interruptions
- 4 hours
- Hours of administration and reporting
- 6 hours
- Time lost to switching between tasks
- 12%
- What an hour of your work is worth
- $35.00
- Share of the lost time you could reclaim
- 25%
- Working weeks per year
- 46 weeks
You get
- Productive hours per week
- 16.20 hours
- Productive share of the week
- 40.5%
- Lost hours per week
- 23.80 hours
- Cost of the lost time per year
- $38,318.00
- Value reclaimed per year
- $9,579.50
- Days of deep work per week
- 2.03 days
The week loses 23.80 hours: 9.00 in meetings, 4.00 to interruptions, 6.00 of admin and 4.80 to switching. That leaves 16.20 productive hours, which is 40.5% of the week and 2.03 eight hour days. At $35.00 an hour the lost time costs $833.00 a week and $38,318.00 across 46 working weeks. Reclaiming a quarter of it gives back 5.95 hours a week, worth $9,579.50 a year, and meetings are 22.5% of the week against 27.0% for admin and switching together.
A 32 hour week with lighter overheads
Four hours of meetings, three of interruptions, four of admin and 8% lost to switching between tasks.
You enter
- Hours worked per week
- 32 hours
- Hours in meetings
- 4 hours
- Hours lost to interruptions
- 3 hours
- Hours of administration and reporting
- 4 hours
- Time lost to switching between tasks
- 8%
- What an hour of your work is worth
- $48.00
- Share of the lost time you could reclaim
- 40%
- Working weeks per year
- 48 weeks
You get
- Productive hours per week
- 18.44 hours
- Productive share of the week
- 57.6%
- Lost hours per week
- 13.56 hours
- Cost of the lost time per year
- $31,242.24
- Value reclaimed per year
- $12,496.90
- Days of deep work per week
- 2.31 days
The week loses 13.56 hours, leaving 18.44 productive hours, which is 57.6% of a 32 hour week and 2.31 eight hour days. At $48.00 an hour the lost time costs $650.88 a week, or $31,242.24 across 48 working weeks. Reclaiming 40% of it returns 5.42 hours a week, worth $12,496.90 a year. The shorter week keeps more productive hours than the 40 hour week in the other example because its overheads are smaller, not because the work is easier.
Guides that go with it
How Fast Can You Build a $10,000 Emergency Fund?
Ten thousand dollars sounds like a mountain until you break it into monthly chunks. By the end of this guide you will know how to calculate your personal timeline, pick a monthly target that does not…
How Much of Your Salary Should Go to Rent?
You can work out a defensible rent ceiling in about fifteen minutes with nothing more than your payslip and a calculator. By the end of this guide you will know your gross and take-home pay, the rent…
How Much Does It Cost to Drive 100 Miles?
A hundred miles is a nice round trip to price out: one weekend outing, one leg of a longer journey, one week of commuting. By the end of this guide you will be able to work out your own cost for that…
Frequently asked questions
How is the time lost to switching between tasks calculated?
It is a share of your working hours rather than a log of minutes, because the cost is spread through the day in fragments. At 12% of a 40 hour week that is 4.80 hours. The share is meant to capture the refocusing after each interruption, which is real but rarely written down anywhere.
If you already log interruptions, put those hours in the interruption field and keep the switching share low, so the same time is not counted twice. Estimating both generously is the quickest way to make a week look worse than it is.
Is administration really lost time?
Some of it is the job and some of it is overhead. Reporting a client or a regulator requires is work; re-entering the same data in three systems is not. The calculator treats everything you enter as lost, so enter only the part you would drop if you could.
In the first example admin plus switching is 27.0% of the working week, which is more than the meetings take. It is usually the quietest loss and the easiest one to reduce, because nobody has it in their diary.
What does the hourly value mean here?
It is the value you put on an hour of your work, used to price the lost time. For a business owner it is close to the rate you charge; for an employee it is the cost of your time to the employer, which is the salary divided by the hours worked. The figure measures the size of the loss rather than what you would be paid for one more hour.
The annual cost multiplies the weekly cost by the working weeks you enter, so it describes the pattern rather than one bad week. That is what makes a small daily interruption visible at the scale of a year.
How should I choose the reclaim share?
It is the part of the lost time you could realistically get back, and it is worth testing more than one value. Reclaiming a quarter of the lost time in the first example is 5.95 hours a week, worth $9,579.50 a year at $35 an hour; reclaiming half doubles it. The figure is a target rather than a promise, because the habit that created the interruptions has to change for the time to return.
Start with the change that costs nothing: shorter meetings, one stated hour for messages, or a block of the day with notifications off. The Work Hours Calculator is useful alongside this page if you also want to see how the hours are distributed across the week.