Worked example
If dropping one working day reduces annual take-home pay by £4,000 but gives back hundreds of hours each year, you can calculate the implied price you are paying for that free time.
Frequently asked questions
What if my employer offers four days for full pay?
Enter the same annual pay in both boxes. The calculator will show the additional time without a pay sacrifice.
Does this include commute savings?
No. Add those separately when evaluating the result; avoiding one commute each week can make the four-day option more valuable.
How to value an extra non-working day
A shorter week is not just a salary question. Compare the annual take-home pay you expect under each arrangement with the paid hours you will actually work. The calculator expresses the pay sacrificed, if any, against the hours returned to you over a year.
When the proposed four-day week keeps the same weekly hours, it is really a compressed-hours arrangement. When weekly hours fall, it is reduced hours. That distinction matters because longer days may preserve pay while creating different fatigue, childcare or commuting effects.
Before deciding, also consider
- whether workload and targets reduce with your contracted hours;
- commute and childcare savings on the non-working day;
- how pension contributions or benefits change with pay;
- whether the extra day off is fixed or can move.
The tool helps show the implied financial cost of time gained. A lower annual income can still represent a worthwhile trade if the additional free time has high personal value to you.