Seven quick numbers from your last real week. Everything is worked out in your browser, so nothing you type leaves this page.
Your scheduled 12 hours, plus the minutes you arrive early for report, plus your average late clock-out for charting. Most nurses land between 12.5 and 13.5.
Door to door, not the map estimate. Include parking, the walk to your unit, and badging in. If the drive home takes longer, use the average of both trips.
From your alarm (or getting out of bed) to walking out the door: shower, scrubs, packing food and your bag.
Actual. Count the sleep you really got, not the hours you spent in bed. A phone or watch tracker helps. If you don’t use one, make an honest guess.
Use your average across your days off. Leave out the long crash nap after your last night shift. That belongs in recovery below.
Groceries, pharmacy, bills, appointments, cleaning, laundry, and cooking for the stretch. Count travel time too. Most nurses land between 8 and 14 hours.
Defaults are set for a typical 7-to-7 shift. Switching between day and night updates the sleep and recovery defaults.
A 3×12 schedule promises four days off. Most nurses know it never feels like four. This calculator shows you why, in real hours, using the numbers from your own week instead of a perfect one.
You enter seven numbers: how long your shifts really run, your commute, your get-ready time, your sleep, your errands, and how long the fog lasts after a stretch. The calculator subtracts all of it from the 168 hours in a week and shows you what’s left, one square per hour.
The method comes straight from our nurse’s 3×12 schedule breakdown. The calculator does the math for you in about two minutes.
How to fill in each number
Your result is only as honest as your inputs. Use a real recent week, including the annoying parts. A quiet week with no appointments gives you a number you can’t plan around.
Scheduled 12 hours, plus how early you arrive for report, plus your average late clock-out. Pull your last three clock-out times if your system shows them.
Door to door. Parking, the garage walk, and badging in all count. The map app number is almost always too low.
From getting out of bed to walking out the door. Shower, scrubs, coffee, packing food and your bag.
The sleep you actually got, not the hours you lay in bed. Night shift nurses often land at 5 to 6 hours here.
Your average night on days off. Leave out the long crash nap after your last night shift. That goes in recovery.
Time you were off and awake but couldn’t do anything useful. Count any block of 30 minutes or more. Pick the card closest to your week.
Groceries, pharmacy, bills, appointments, cleaning, laundry, and cooking for the stretch. Include the drive to each one.
Four mistakes that skew your result
Typing 12 for shift length because that’s what the schedule says.
Counting time in bed as sleep.
Skipping the recovery fog because it feels like cheating.
Logging errands without the drive there and back.
Use your real clock-in and clock-out average.
Check your tracker, or subtract the time it took to fall asleep.
Count awake-but-useless hours. They’re real and they belong here.
Measure each errand door to door.
What your number means
Your schedule says 96 hours off on a three-shift week. Nobody gets 96. Here’s how to read where you landed.
Your systems are working. Protect them, and check the result again after any schedule change.
Most nurses land here. One or two changes from your result panel usually move you up by several hours.
This is a schedule problem, not a you problem. Start with sleep or shift spacing, since both shrink the fog too.
How the calculator works
Every number comes out of the same 168-hour budget. The calculator never adds forward. It only subtracts, so no hour gets counted twice.
The “days off that feel truly free” number takes your awake hours on days off and removes the fog and errands from them. The hour grid places each block at a typical time of day, so treat it as a picture of your week rather than a clock-perfect schedule.
Weeks are messy, and no calculator knows about the double shift, the sick kid, or the night you couldn’t sleep at all. The result is an estimate built from your averages. Use it to spot the biggest leak, not to grade yourself.
Day shift vs night shift: what the defaults assume
The calculator starts with typical numbers for each shift so you can see a result right away. Change any of them to match your real week.
| Default | ☀️ Day shift | 🌙 Night shift |
|---|---|---|
| Real shift length | 12.5 hours | 12.5 hours |
| Commute, one way | 35 minutes | 35 minutes |
| Sleep before a shift | 7 hours | 5.5 hours |
| Sleep on a day off | 7.5 hours | 7 hours |
| Recovery fog | About 6 hours | About 14 hours |
| Typical free time | About 57 hours | About 55 hours |
Night shift loses most of its difference to lighter day sleep and a longer flip back. Our guides on how to sleep during the day and flipping your sleep schedule between nights and days go after both.
The one fix worth making for each leak
Your result panel ranks suggestions for your numbers. As a quick reference, here’s the highest-value fix for each kind of leak.
| Biggest leak | The one fix worth making |
|---|---|
| Short sleep | Make the room fully dark and quiet before changing anything else. |
| Long recovery fog | Cap the sleep after your last night at 4 hours, then go to bed by 10 p.m. |
| Spread-out shifts | Request your shifts back to back so you recover once, not three times. |
| Scattered errands | Pick one errand day and stack every stop into a single loop. |
| Slow mornings before shifts | Hang three complete outfits and pack the bag before the stretch starts. |
| Late clock-outs | Chart as you go during quieter moments, so the last hour stays clear. |
For the details behind each fix, see blackout bedroom ideas, a renter-safe soundproofing guide, how to split your days off, how to keep a clean house working three 12s, and a uniform closet built for a 3×12 rotation.
What your free-hours number does not tell you
It’s one useful number, not the whole picture. Three things matter as much as the total.
Once you know your number, a planned reset day and a steady come-home routine help you keep the hours you win back.
Frequently asked questions
Why doesn’t my result match the 96 hours off on my schedule?
The 96 hours only counts days off. It leaves out the commute, early arrivals, late charting, sleep, recovery, and errands. Once those come out, most nurses keep somewhere between 45 and 60 hours.
Is a 3×12 schedule really only 36 hours of work?
Your paid hours often are. Door to door, with getting ready, the commute, and late clock-outs, most nurses spend 42 to 44 hours on work each week.
Why does spreading out my shifts lower my free time?
Each block of shifts needs its own recovery. Three single shifts can mean three foggy days instead of one, so the calculator raises your recovery hours when you pick “spread out.”
Does this work for 4x10s, 2x12s, or rotating shifts?
For 2 or 4 shifts a week, pick that number at the top. For 10-hour shifts, enter your real shift length, such as 10.5. For rotating schedules, run the calculator once for your day week and once for your night week.
What’s a healthy amount of sleep to aim for?
Most adults need at least 7 hours a night, which adds up to 49 a week. If your weekly sleep comes in under that, the result panel flags it, because better sleep also shrinks next week’s fog.
How often should I run it again?
Every 3 to 4 months, or after a switch between days and nights, a move, or a stretch that felt much harder than usual. Watch whether your free hours grow.
Are my numbers saved anywhere?
No. Everything is calculated in your browser. Your numbers are never sent to a server, stored, or shared, and they disappear when you close the page.
