Calculating Shift Hours at Month-End

Month-end should not be a guessing game. If you work shifts, your hours almost never follow the same pattern twice: a few eight-hour days, a couple of long ones, one short call-in, and overtime that quietly appeared at the end of a night shift. The reason most people get their number wrong is simple — they calculate from memory instead of from a record. Start from a daily log and the whole process drops to ten minutes.

Step 1: Add up every shift on its own

Do not total everything in one go. Go through the roster and note each shift separately: date, start time, end time, then its own duration. Why? Because your shifts are different lengths — one is eight hours, one is ten, one is a short five. When each shift stands on its own, a mistake shows up immediately, and if one shift does not match the schedule you know exactly where to look.

• Record start and end times to the minute, not to the nearest hour.
• Subtract unpaid breaks if they are not counted on your contract.
• Flag any shift with a long handover or call-in — those usually need an explanation.

Step 2: Split overtime from base hours

The gap between base and overtime is not cosmetic — each one is paid differently. Overtime is any hour beyond the agreed weekly or monthly limit, and public-holiday and night hours often carry their own treatment. If you add it all into one total, you land on a big number that does not match the payslip, and you cannot tell where it broke. Keep three columns: base, overtime, and allowances.

A simple worked example

Say the month has 26 working days and you logged 26 shifts as follows:

• 20 shifts x 8 hours = 160 base hours
• 4 shifts x 9 hours = 36 hours
• 2 extra overtime hours after two of those shifts

That is 160 plus 36 = 196 hours, plus 2 overtime hours. Raw hours total 198, but the overtime line on its own is only 2. If you treat all 198 as base, you lose the overtime rate difference. If you count only 196, you lose the two hours entirely. Correct approach: log 196 base and 2 overtime as separate figures.

Step 3: Check the payslip against your record

When the payslip lands, do not just glance at the final figure. Go line by line:

• Do the paid hours match your own total?
• Is there a clear overtime line?
• Are night or holiday allowances present, and in the right quantity?
• Small rounding differences happen, but a whole missing shift needs a query.

If something looks off, raise it calmly with your supervisor while holding your own numbers and dates. "I logged 196 base hours and 2 overtime hours, here are the dates" gets resolved fast. "I think something is missing" does not.

This is why logging daily matters. Memory fades. Shiftat-E records your shifts and hours, and lets you review the monthly schedule before payday — instead of stacking up loose notes and paper at the end of the month.

The bottom line

Month-end maths is easy once you break it down: total each shift alone, separate overtime, then compare the payslip to your log. The app is currently in its launch phase and is being shaped by user feedback, so any note that makes it more accurate for your job is welcome. Log your shifts as you go, and the number is ready when you need it — download Shiftat-E free on Google Play.