Firefighter Shift Schedules Explained: Kelly, 48/96, and 24/48

Ask two firefighters what schedule they work and you can get two very different answers — "Kelly," "48/96," "24/48" — and if you've never worked a fire schedule, none of those mean much. They all involve 24-hour shifts and 3 platoons, but the shape of your month, and how long your breaks are, changes a lot depending on which one your department runs.

Here's the honest version up front: there's no single "firefighter schedule." What follows is how the common ones are built. Your exact rotation, your hours before overtime, and your platoon assignment all come from your own department — so treat this as a map, not a rulebook.

The building block: the 24-hour shift and 3 platoons

Most fire departments in the US run 24-hour shifts staffed by three platoons (often called A, B, and C shift). At any moment, one platoon is on duty, and the other two are off. The different schedules below are really just different ways of arranging whose 24 hours land on which day — and how the off days get grouped.

Because one of three platoons is always working, most of these rotations land in the same ballpark for total hours over a full cycle. Where they differ — and where firefighters have strong opinions — is how those off days clump together.

24/48: the simplest rotation

24 hours on, 48 hours off. You work a full day, then you're off for two, then back on.

• Cycle length: 3 days, repeating cleanly.
• Each platoon works every third day.
• The trade-off: your off time comes in two-day chunks, and it's predictable, but you never get a long stretch off within the basic cycle.

It's the easiest schedule to explain and to plan around — you always know that "day on, day off, day off" repeats — which is exactly why a lot of departments still use it.

The Kelly schedule: a 9-day cycle with a 4-day break

The Kelly schedule takes those same 24-hour shifts and arranges them over a 9-day cycle so that a longer break falls out at the end:

• Day 1: on (24)
• Day 2: off
• Day 3: on (24)
• Day 4: off
• Day 5: on (24)
• Days 6–9: off (a 4-day / 96-hour break)

So within nine days you work three 24-hour shifts, spaced by single off days, and then you get four days off in a row before it starts over. The appeal is obvious: that recurring 4-day block is enough time to actually leave town, sleep off a rough tour, or be present for something at home — without burning vacation. The catch is the front half, where you're bouncing on-off-on-off-on and the single days off can feel thin after a busy shift.

48/96: fewer commutes, longer blocks

48 hours on, 96 hours off. You work two 24-hour shifts back to back, then you're off for four straight days.

• Cycle length: 6 days.
• The draw: you commute to the station far less often, and every single break is a full four days — great if you live far from the firehouse or work a second job.
• The trade-off: 48 continuous hours on duty is a long time, and back-to-back busy tours with little sleep in between are the real downside people point to.

Whether 48/96 is better than the Kelly is genuinely a matter of preference and how busy your station runs — a slow house makes 48s easy, a high-call-volume house makes them brutal.

Why they tend to even out

Here's the part that surprises people: 24/48, the Kelly, and 48/96 all tend to average out to a similar number of hours per week over a full cycle, because they're all built on "one of three platoons is always on." The schedules mostly differ in how the same hours are distributed, not in how many hours you work. That's why the debate between them is almost never about total workload — it's about lifestyle: short frequent breaks versus long infrequent ones, more commutes versus fewer, single days off versus four-day blocks.

Where overtime and the exact rules come from

Firefighter hours interact with overtime differently than a standard 40-hour job. In the US, fire protection employees are commonly covered by a special provision (the FLSA "7(k)" exemption) that sets the overtime threshold over a multi-week work period rather than a flat 40 hours a week — but the exact threshold, your pay period length, and how trades and callbacks count all depend on your department and, if you're in a union, your contract.

None of that is something to guess at. As with the schedule itself, the real answer lives in:

• Your department's policy or general orders, which define the rotation and platoon assignments.
• Your union contract (CBA), which usually spells out hours, overtime, and shift-trade rules.
• Your actual pay period, where you can see how your hours are counted before overtime kicks in.

Seeing your rotation before it sneaks up on you

The hardest part of any of these schedules isn't the math — it's keeping a clear picture of which days you're actually on weeks out, especially on a Kelly cycle where the pattern doesn't line up neatly with the calendar week. That's what Duty Pals is built for: set your rotation once — Kelly, 48/96, 24/48, or a variation your department runs — and it lays out years of your on and off days automatically, so you can see that 4-day break coming and plan around it instead of counting shifts off a station calendar. Duty Pals is currently in pre-registration; you can sign up to be notified when it launches.