Calculating your working hours involves a simple subtraction: end time minus start time, minus break duration. This straightforward operation quickly becomes a source of errors when repeated five days a week, over an entire month, with variable hours. Mastering this basic calculation avoids unpleasant surprises on the payslip and provides a concrete lever in case of disagreement with the employer.
Convert minutes to decimals before calculating hours
Before pulling out the calculator, one reflex changes everything: convert minutes to hundredths of an hour. Without this step, adding durations expressed in hours and minutes causes systematic discrepancies.
Take an end time of 5:45 PM. In decimal, 45 minutes correspond to 0.75 hours (45 divided by 60). A start time of 8:15 AM gives 8.25. The subtraction becomes clear: 17.75 – 8.25 = 9.50 hours of presence.
Have you ever noticed that a statement shows 7.50 hours instead of 7 hours 30 minutes? This is exactly the principle. The decimal notation is what payroll software uses. If you track your hours on paper or in a spreadsheet, adopting this format from the start eliminates last-minute conversions and reduces discrepancies.
To find the method for calculating hours on Ecostart, the principle remains the same: each 15-minute block is worth 0.25, each 30-minute block is worth 0.50.
Calculate your working hours day by day with breaks
The basic formula can be summed up in one line: working hours minus break duration equals actual working time. Actual working time, in the sense of the Labor Code, only includes periods when the employee is available to the employer.
Applying the formula to a concrete example
An employee arrives at 9:00 AM, leaves the office at 5:30 PM, and takes a one-hour lunch break. In decimal: 17.50 – 9.00 = 8.50 hours of presence. We subtract 1.00 hour for the break. Result: 7.50 hours of actual work, or 7 hours 30 minutes.
If the break lasts 45 minutes (0.75 in decimal), the result goes to 7.75 hours, or 7 hours 45 minutes. A few minutes of difference per day can add up to several hours over a month.
What counts as a break and what does not
A break corresponds to a time when the employee can freely attend to their activities. A waiting time imposed by the employer, on-call duty on-site, or travel between two clients does not count as a break.
- The classic lunch break (free to leave the post) is deducted from the calculation.
- A break during which the employee must remain reachable or on-site counts as actual working time.
- Micro-coffee breaks of a few minutes are generally not counted, unless there is an agreement or contrary practice in the company.
Checking this point avoids underestimating your actual total at the end of the week.
Moving from daily calculation to weekly and monthly totals
Adding up five days gives the weekly total. This weekly total is the legal reference for identifying any overtime. The counting of overtime is done on a calendar week, from Monday to Sunday, not averaged over the month.
Why weekly counting is crucial
Let’s imagine two consecutive weeks. The first totals 39 hours of actual work, the second 31. On average, that gives 35 hours. A monthly calculation would obscure the excess of the first week.
The Labor Code provides for a weekly count. Hours beyond the applicable threshold entitle the employee to an increase or compensatory rest. Compensating them from one week to the next without an annualization agreement is irregular.
Calculating the monthly total for the payslip
To obtain the monthly volume, add the totals from each week of the month. The theoretical reference used in payroll for full-time at 35 hours per week is 151.67 hours monthly. This figure results from the following calculation: 35 hours multiplied by 52 weeks, divided by 12 months.
Comparing your personal statement to the total displayed on the payslip allows you to spot a discrepancy before it repeats for several months in a row.
Keep a reliable personal record of your worked hours
Few employees know this, but a personal table can be enough to support a claim for overtime before the labor court. The Court of Cassation reminded, in a decision dated November 14, 2018, that overtime must have been requested or at least implicitly accepted by the employer. A dated record, day by day and week by week, constitutes a serious element in this context.
What your record should contain
- The date, arrival time, departure time, and duration of each break, for each day worked.
- The weekly total in decimal hours, calculated from Monday to Sunday.
- Any particular circumstances: express request from the manager, exceptional workload, written exchange confirming the need to stay late.
- In telework, connection and disconnection times, even if they alone are not sufficient to prove the actual duration of work.
Keeping schedules, timestamped messages, and personal records rather than relying on a single source enhances the credibility of the count. The employer, for their part, must be able to provide their own tracking elements, including in the absence of a time clock.
Telework and time tracking
Working from home does not exempt the employer from tracking working time. Connection logs can document a situation, but they do not always reflect the actual time spent on tasks. Cross-referencing multiple sources of evidence remains the best protection for both parties.
Calculating your working hours does not require sophisticated tools. A well-placed subtraction, conversion to decimals, and a daily record cover most situations. The reflex to maintain: check your total each week, not just at the end of the month when the payslip arrives.
