Time Management Calculator
Where your working week actually goes, what the lost hours cost, and what one reclaimed hour a day is worth over a year.
- Free, no sign-up
- Runs in your browser, nothing is stored
- Formula and worked example included
Time Management Calculator
Enter your figures to see results.
Where does the working week actually go?
Most owners know their rent to the pound but have no idea what their diary costs. This tool puts a price on it: track a typical week, split the hours into productive, non-productive and unaccounted, and see what the lost hours are worth at your rate, and what reclaiming one hour a day adds up to over a year.
How to use this calculator
- Track one typical week. Note each block of time as productive, non-productive or unaccounted.
- Enter the totals for productive and non-productive hours against the hours you worked.
- Add your hourly rate or the cost of the most senior person doing the work to cost the lost time.
What your result means
How to read the figure, what counts as normal, and what to do about it.
Time as a cost line
Most owners can quote their rent to the pound but have no idea what their diary costs. This calculator puts the working week on the same footing as any other expense: hours in, hours wasted, and what that waste is worth at the rate you could otherwise charge or the wage you pay someone senior. The point is not to work more hours; it is to see which of the existing ones are being spent well.
Track a typical week first. Note each block of time as productive, non-productive or unaccounted. The unaccounted figure is usually a surprise, and usually the easiest to recover.
What a healthy split looks like
Nobody is productive for 100% of the week, and trying to be tends to burn people out. For an owner-manager a realistic pattern is:
- 55–65% productive: client work, sales, product, decisions only you can make.
- 20–25% necessary overhead: planning, useful meetings, learning, genuine admin.
- Under 15% waste: interruptions, rework, low-value tasks that should be delegated or dropped.
If productive time is below half the week, the fix is rarely more discipline. It is usually a structural change: a bookkeeper, a scheduling tool, batching email into two slots, or saying no to one recurring meeting.
Worked example: a freelance designer
The designer works 45 hours a week and bills at £60 an hour. A week's tracking shows 26 hours of client work and 12 hours of email, chasing invoices, admin and interrupted starts. 7 hours are unaccounted for.
Productive time = 26 ÷ 45 = 58%. The 12 non-productive hours are worth £720 a week at the billing rate, over £33,000 a year.
Handing invoicing and bookkeeping to a part-time bookkeeper at £25 an hour for 3 hours a week costs £3,450 a year and returns those hours to billable work worth £8,280, or, more realistically, to going home on time.
Frequently asked questions
What should I count as productive?
Work that a client pays for, that produces something you sell, or that only you can do and moves the business towards its goals. Necessary admin is not waste but it is not productive either; treat it as overhead.
How do I work out the value of my time?
Use your billing rate if you charge by the hour. Otherwise divide your target annual profit or salary by the hours you want to work. For a £60,000 target over 1,800 hours, that is about £33 an hour.
Is it worth paying someone to do admin at a lower rate than mine?
Usually yes if you will spend the freed time on work that earns more than you pay. Delegation only fails when the recovered hours drift into more low-value activity.
How long should I track my time for?
One representative week is enough for a first picture. Repeat every quarter to see whether changes have stuck.
The maths behind this calculator
For anyone who wants to check the working or rebuild it in a spreadsheet.
The formulas
Productive time (%) = Productive hours ÷ Available hours × 100 Unaccounted hours = Available − Productive − Non-productive Cost of non-productive time = Non-productive hours × Hourly value Value of one reclaimed hour a day ≈ Hourly value × 5 days × 46 weeks
Assumptions and limits
- "Value per hour" is an opportunity cost, not cash: you only realise it if the reclaimed time is actually used to earn or to reduce paid hours elsewhere.
- The annual figure assumes a 46-week working year (allowing for holidays and bank holidays).
- Non-productive does not mean unnecessary. Some admin is unavoidable; the aim is to identify what can be delegated, automated or stopped.
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