Days, hours and shifts are different
These three formats describe annual leave in different ways.
| Format | What it tells you |
|---|---|
| Days | Headline annual leave entitlement |
| Hours | Total value of the leave |
| Shifts | How the balance fits your actual rota |
For example, two NHS employees might both have 202.5 hours of annual leave.
One works 7.5-hour shifts. Another works 11.5-hour shifts.
They have the same total leave hours, but those hours translate into a different number of full shifts.
How NHS annual leave days become hours
The standard full-time NHS working week is commonly based on 37.5 hours.
If that is divided across five standard days:
37.5 ÷ 5 = 7.5 hours
So the standard leave figures become:
| Annual leave | Equivalent hours |
|---|---|
| 27 days | 202.5h |
| 29 days | 217.5h |
| 33 days | 247.5h |
For example:
27 × 7.5 = 202.5 hours
This is why a 7.5-hour day is used as the reference point.
UK nations: the 37.5-hour standard week applies in England. NHS Scotland’s standard full-time week reduced to 36 hours from 1 April 2026, so the equivalent hours are lower there.
For a fuller calculation guide, see How to Work Out NHS Annual Leave in Hours.
Why 27 days does not always mean 27 shifts
The 27-day figure is based on a standard 7.5-hour day.
If you actually work longer shifts, each shift uses more of your hourly leave balance.
For example, with an annual leave entitlement of 202.5 hours and paid shifts of 7.5 hours:
202.5 ÷ 7.5 = 27 shifts
But if your paid shifts are 11.5 hours, the result is very different.
Seventeen 11.5-hour shifts use:
17 × 11.5 = 195.5 hours
Remaining:
202.5 − 195.5 = 7 hours
So: 202.5 hours = 17 full 11.5-hour shifts + 7 hours remaining
The entitlement has not reduced. The hours are simply being used in larger blocks.
The same 202.5 hours across different shift lengths
This is the easiest way to see the relationship.
| Paid shift length | Full shifts | Remaining leave |
|---|---|---|
| 7.5h | 27 | 0h |
| 10h | 20 | 2h 30m |
| 11.5h | 17 | 7h |
In every example, the starting entitlement is 202.5 hours. Only the shift length changes.
Why hours are the bridge between days and shifts
Hours are what connect the headline entitlement to the actual rota.
Days
Days are useful for describing the standard entitlement. For example: 27 days.
Hours
Hours give that entitlement a fixed time value. For example: 27 days = 202.5 hours.
Shifts
Your actual shift length determines how those hours are used. For example, 202.5 hours ÷ 11.5-hour shifts gives 17 full shifts + 7 hours remaining.
This is why an hourly leave balance is especially useful for NHS staff working non-standard shift lengths.
Do longer-shift workers get less annual leave?
No.
Someone working longer shifts may get fewer individual shifts off, but each of those shifts contains more working hours.
For example, a worker on 7.5-hour shifts could use:
27 × 7.5 = 202.5 hours
A worker on 11.5-hour shifts could use:
17 × 11.5 = 195.5 hours
and still have 7 hours remaining.
Both are working from the same 202.5-hour entitlement.
So fewer shifts does not mean less annual leave. It simply means each shift uses a larger portion of the hourly balance.
29 days in hours and shifts
After the relevant service milestone, the standard full-time entitlement may increase to 29 days.
29 × 7.5 = 217.5 hours
If you work 7.5-hour shifts:
217.5 ÷ 7.5 = 29 shifts
If you work 11.5-hour shifts, 18 full shifts use:
18 × 11.5 = 207 hours
Remaining:
217.5 − 207 = 10.5 hours
So: 217.5 hours = 18 full 11.5-hour shifts + 10h 30m
33 days in hours and shifts
At the higher standard service level:
33 days = 247.5 hours
At 7.5 hours per shift:
247.5 ÷ 7.5 = 33 shifts
At 11.5 hours per shift, 21 full shifts use:
21 × 11.5 = 241.5 hours
Remaining:
247.5 − 241.5 = 6 hours
So: 247.5 hours = 21 full 11.5-hour shifts + 6 hours
Again, the total entitlement is unchanged.
What about part-time NHS staff?
Part-time staff normally have their annual leave entitlement adjusted according to their contracted hours.
For example, instead of starting with the full-time 202.5 hours, a part-time worker may have a lower pro-rata hourly entitlement.
Once the entitlement has been calculated in hours, the same principle applies:
Leave hours ÷ paid shift length = equivalent shifts
So the process is: contracted hours → annual leave hours → actual shifts
For detailed part-time calculations, see NHS Part-Time Annual Leave in Hours.
What about public holidays?
Public holiday entitlement is commonly treated separately from annual leave, although the way it appears in an HR or leave system can vary.
You may see:
- annual leave hours
- public holiday hours
- a combined balance
- separate balances
If public holiday hours are shown separately, do not automatically add them to your annual leave balance unless that matches the way your employer records them.
Which format should you use?
Different formats are useful for different jobs.
Checking your headline entitlement
Use days. For example: 27, 29 or 33 days.
Checking your actual balance
Use hours. For example: 86h 15m remaining.
Planning leave around your rota
Use shifts. For example: 86h 15m against 7h 30m paid shifts.
Comparing different working patterns
Use hours. Hours provide a common unit even when shift lengths are different.
An example from start to finish
Suppose your standard annual leave entitlement is 27 days.
Step 1: Convert days to hours
27 × 7.5 = 202.5 hours
Step 2: Use your actual paid shift length
Suppose your shift is 11h 30m, which is 11.5 hours.
Step 3: Convert the balance into shifts
17 full shifts use 195.5 hours, leaving 7 hours.
So the complete chain is:
27 days → 202.5 hours → 17 full 11.5-hour shifts + 7 hours
That is the relationship between NHS annual leave days, hours and shifts.
Common misunderstandings
“27 days means 27 of my shifts”
Only if your shifts are 7.5 paid hours. Longer shifts use more leave hours per shift.
“Longer shifts mean I get less leave”
No. You may have fewer full shifts off, but each shift contains more hours.
“202.5 hours means 202 hours 50 minutes”
No. 202.5 hours = 202h 30m. The decimal 0.5 means half an hour.
“Everyone with the same service gets the same number of shifts”
Not necessarily. They may have the same full-time hourly entitlement, but different shift lengths can produce different numbers of actual shifts.
“Part-time workers use the full-time hours”
Not normally. Part-time entitlement is generally adjusted first according to contracted hours.
“Every NHS leave system shows public holidays in the same way”
No. The way annual leave and public holiday hours are displayed can differ.
Convert your NHS leave hours into shifts
Already know your current leave balance and paid shift length?
Use the Hundred Hour Holiday Hours to Shifts Calculator to see:
- full shifts
- equivalent shifts
- remaining hours and minutes
- decimal leave hours
For example: 202.5 hours with an 11h 30m paid shift gives 17 full shifts + 7 hours remaining
Convert My NHS Holiday Hours