Compressed Workweek Calculator
Compressed Workweek Calculator
See how to fit your full weekly hours into fewer days. Compare every common pattern, get a personal recommendation, and see days freed up per year.
Compression is not the same as a shorter week
Compression keeps your hours untouched. It just spreads them across fewer days. A 40-hour week becomes four 10-hour days, or three 12-hour days plus a short day, or a five-day summer pattern with four long days and a half-day Friday. You get an extra day off, and your paycheck stays the same.
The opposite — cutting the hours themselves — is a different idea entirely. That one belongs in four-day workweek territory. This tool sticks to compression: same total hours, fewer days on site.
Using the calculator
- Enter the total weekly hours you need to fit. Forty is standard, but 36, 37.5 or 48 all work.
- Set your shift start time. This affects the end times shown in each pattern.
- Add your unpaid break in minutes. It widens the on-site time without changing paid hours.
- Pick which weekday the compressed week should start on.
- Slide the priority control. If you value shorter days, lean left. If you value more days off, lean right.
Every common compression pattern, compared
- 5×8 — the classic baseline: five days, eight hours each.
- 4×10 — the most popular compressed week: four 10-hour days.
- 4×9 + 4 — four 9-hour days and one short 4-hour day.
- 3×12 + 4 — three long days and a short day, common in hospitals.
- 5×4-9 summer — four 9-hour days and a Friday half-day, common in government roles.
- 4×9 — four 9-hour days for a 36-hour week.
- 3×12 — three 12-hour days for a 36-hour week.
Each pattern shows the daily hours, weekly total, days freed up per year, and how many commutes you avoid.
Who should compress
- Shift workers whose employer already runs 24/7 rosters
- Office teams testing a four-day pattern without cutting pay
- Parents who want one weekday completely free every week
- Long commuters who want to cut trips without losing income
- Nurses and security staff on rotating long-day schedules
- Anyone whose week feels fragmented and wants it consolidated
The real trade-off
Every compressed pattern makes the same bargain. It takes your weekly hours and trades them for time off in bigger blocks. The catch is that each working day gets longer. A 4×10 pattern adds two hours to every shift. A 3×12 pattern adds four. Those extra hours carry a cost — tiredness on the back end, less evening time, more planning needed around meals and rest.
What people rarely see is the other side. Compressed weeks free up entire days, not just scattered hours. A full weekday off is worth more than two hours shaved off four evenings, especially when it comes to doctors' appointments, school pickups, or just a proper rest day. That is why so many shift workers stick with compression after the first month — the days off land where they matter.
Where compression gets hard is in how the workplace runs. Meetings still need to happen, and splitting a team across two different day patterns takes coordination. The patterns that survive long term usually pair compression with shorter meeting blocks, clear handover notes, and overlapping core hours. Compression alone does not fix broken workflows — it just moves them around.
Closing thoughts
Run your own numbers. Adjust the priority slider, look at the recommendation, and click any row in the comparison table to see that pattern laid out day by day. When you find one that fits, the yearly numbers give you a real sense of what it is worth — extra days off, fewer commutes, and the same total pay.
Common questions
What is a compressed workweek?
It is a schedule that fits your usual weekly hours into fewer working days. A standard 40-hour week can run as four 10-hour days, or three 12-hour days plus a short day. You keep the same pay and total hours, but you gain a full extra day off.
Does compression reduce my pay?
No. Since your total hours stay the same, your pay stays the same. Only a different schedule or a shorter-hours agreement would change your income.
Which pattern gives the most days off?
3×12 gives four days off a week but is only viable when your weekly hours target is 36. For a standard 40-hour week, the best options are 4×10 or 3×12+4, both of which give three days off per week.
Is 4×10 the same as a 4-day workweek?
Not exactly. A 4×10 is a compressed week — 40 hours in four days. A four-day workweek usually cuts the hours themselves to 32 or 36. Both give you an extra day, but they cost your employer different amounts and are usually negotiated separately.
Do compressed shifts change overtime rules?
In most countries overtime is still based on the weekly total, not the daily one. Since a compressed week stays at your usual weekly hours, no overtime is triggered. Daily caps in some regions still apply — anything over 8 or 12 hours a day can count as daily overtime in those places.
Does the calculator account for breaks?
Yes. Unpaid break minutes widen each shift on site but do not add to paid hours. If you work a 4×10 with a 30-minute unpaid break, you are on site 10.5 hours per day but paid for 10.
What about summer hours or 5/4-9 patterns?
These are included. In the comparison table you will see 4×9+4 as a full-year option, and the 5×4-9 summer pattern listed as a variation. Both fit a 40-hour week by shortening one day to 4 hours and extending the others to 9.
How do I choose between compression and a shorter week?
Compression is easier to negotiate — your employer pays the same and gets the same hours. A shorter week cuts hours, which means either a pay cut or a productivity argument. Start with compression if your priority is a day off without changing your income.