What is the Life Weeks Calculator?
The Life Weeks Calculator helps you see your life as a finite number of weeks.
If you are fortunate to live to around 80, that works out at roughly 4,000 weeks. The calculator estimates how many weeks you may have left and how much of the time between now and retirement is likely to be taken up by paid work.
It is inspired by the idea explored in Oliver Burkeman’s book Four Thousand Weeks, but it is not affiliated with the author or the book.
How the Calculator Works?
Enter your current age, planned retirement age, usual working hours, holiday allowance and an illustrative lifespan.
The calculator places your life on a week-by-week timeline. It separates the period between now and retirement into paid-work weeks and more open weeks, based on your hours and holiday allowance.
You can then compare what happens if you retire at a different age or reduce your working hours.
Step 1: Add Your Life and Work Details
Enter your age, the age you started paid work, your planned retirement age, usual weekly hours and annual holiday allowance.
Step 2: Choose Your Illustrative Lifespan
Use age 80 for the traditional “about 4,000 weeks” view, or choose another age for comparison.
Step 3: Explore the Time Trade-Offs
See how many weeks may remain, how many weeks between now and retirement are represented by paid work, and how changing hours or retirement age alters the picture.
Disclaimer: This calculator provides an illustration of life and working time only. It is not a longevity forecast, healthy life expectancy estimate, productivity system, pension calculator or financial plan.
Living to age 80 is used as a simple illustration and is not a prediction or promise. The calculator is inspired by the broad “4,000 weeks” concept but is not affiliated with Oliver Burkeman or the book Four Thousand Weeks.
What does retirement mean to you?
Traditional retirement is broken. Understand how our calculator enables you to live a better life now vs later.
Retire from corporate work?
Use the tool to utilise how you can step away from the corporate world and live life on your own terms.
Work less, live more
See how part-time or project-based work can bridge your income gap while giving you more time for life.
Freedom through planning
Understand how your savings, spending and investments can work together to buy back your time.
Test-drive retirement early
Model scenarios that let you experience elements of retirement before fully stepping away.
What a limited number of weeks can look like in real life
The calculator does not tell anyone to retire, reduce their hours or rearrange their life. It makes the time trade-off visible. These examples show how different working patterns can change the number of weeks that are represented by paid work before retirement.
Amelia, questioning the five-day week
Age 40 • Retire at 60 • 37.5 hours a week • 5.6 weeks of holiday
Amelia has young children and feels that the next decade matters as much as retirement itself. She uses age 80 as the illustrative lifespan and compares her current hours with a 30-hour week.
- She has about 2,080 weeks left in the age-80 illustration.
- There are around 1,040 calendar weeks between age 40 and 60.
- Her current pattern represents roughly 870 full-time-equivalent paid-work weeks.
What Amelia takes from it
Comparing 37.5 hours with 30 hours shows around 174 more open-week equivalents before age 60. The calculator does not say whether she can afford to reduce her hours. It gives her a time figure to consider alongside a separate household and retirement calculation.
Daniel, making space for creative work
Age 52 • Retire at 67 • 35 hours a week • 6 weeks of holiday
Daniel has a secure job but wants to spend more time painting and teaching evening classes. He compares his current 35-hour week with a four-day, 28-hour arrangement.
- He has about 1,456 weeks left in the age-80 illustration.
- There are around 780 weeks between age 52 and 67.
- His current pattern represents roughly 604 full-time-equivalent paid-work weeks.
What Daniel takes from it
The shorter week creates around 121 additional open-week equivalents before retirement. Daniel still needs to consider income, pension saving and job availability, but the comparison shows that part-time work can change the years before retirement rather than only the finish date.
Janet, already easing out of paid work
Age 61 • Retire at 65 • 25 hours a week • 7 weeks of holiday
Janet has already moved to three working days a week. She uses the calculator to understand how different her final four years of employment look compared with continuing on a standard full-time schedule.
- She has about 988 weeks left in the age-80 illustration.
- There are around 208 weeks between age 61 and 65.
- Her current hours represent roughly 113 full-time-equivalent paid-work weeks.
What Janet takes from it
Janet sees that almost half of her remaining calendar weeks before retirement sit outside the paid-work equivalent in this illustration. It confirms that she has already changed the shape of her final working years, even though her formal retirement date remains 65.
What is the Life Weeks Calculator?
The Life Weeks Calculator estimates how many weeks you may have left if you live to a chosen age, and how much of the time before retirement is represented by paid work. It is an illustration of time, not a longevity forecast or financial plan.
Why is a lifetime described as 4,000 weeks?
Eighty years is approximately 4,160 weeks. The phrase “about 4,000 weeks” is a simple way of showing that even a long life contains a surprisingly limited number of weeks.
Does the calculator predict how long I will live?
No. The lifespan you enter is an illustration only. The calculator does not use medical information, family history or official life expectancy data.
What are paid-work weeks?
Paid-work weeks are the equivalent number of full 40-hour weeks represented by your usual working hours.
Holiday allowance is removed from the working year before the calculation is made.
What are open weeks?
Open weeks are the remaining weeks between today and retirement after the paid-work equivalent has been deducted.
They are not automatically free time. They may still include commuting, caring, household tasks and other responsibilities.
Why does the calculator ask when I started working?
This helps place your working life within the full-life timeline. It shows the broad period before paid work, the working years, and the period after your planned retirement age.
Does part-time work create more open weeks?
In the calculator’s illustration, yes. Reducing hours lowers the equivalent number of paid-work weeks between now and retirement.
Whether part-time work is affordable is a separate financial question.
What if I work more than 40 hours a week?
The paid-work equivalent may be higher than the number of calendar working weeks because the calculator uses a 40-hour week as its reference point.
This illustrates the additional time represented by longer working hours.
Does annual leave count as open time?
Yes. Holiday weeks are removed from the paid-work calculation.
However, the calculator does not assume that every week of annual leave is fully free from work or other responsibilities.
Can I compare different retirement ages?
Yes. You can compare how moving retirement earlier or later changes the number of working and post-retirement weeks in the illustration
Can I compare shorter working weeks?
Yes. The calculator includes comparison options such as 30-hour and 25-hour working weeks.
Does this tell me whether I can afford to retire early?
No. It only shows the time trade-off.
A retirement calculator is needed to explore whether your savings, pensions, investments and future income could support an earlier retirement.
Is this based on Oliver Burkeman’s book?
The calculator is inspired by the broad idea that a long life contains roughly 4,000 weeks, which is explored in Four Thousand Weeks.
It is an independent educational tool and is not affiliated with Oliver Burkeman or the publisher.
Is this financial advice?
No. It does not model income, pensions, tax, savings or retirement affordability.
Trust and education
Certified Money First Aider®
These calculators are built by a Certified Money First Aider to help you think more clearly about money and time. Money First Aid® is about practical, non-judgemental support for financial wellbeing. The calculators can certainly help you make informed decisions, but they are not regulated financial advice.
