Undertime Calculator

Left at 4:15 PM? Here is how much undertime that is

Your schedule ends at 5:00 PM, but you left at 4:15 PM to beat the traffic. Payroll will call that undertime, and you want to know how many minutes it is and how much it may cost before the payslip arrives.

Undertime is the time you are short of your required work hours, usually because you left early. This calculator compares the time you actually worked with an 8-hour day or a 40-hour week and shows the shortfall in minutes and in hours and minutes. It counts the missing time. It does not decide whether the time was excused or whether your pay can be reduced; your company's policy and the law settle that.

How to compute undertime in minutes

There are two ways, depending on what your record shows.

From your time out

Subtract your actual time out from your scheduled time out, then turn the hours into minutes by multiplying by 60.

From hours worked

Subtract the hours you worked from the hours required, then convert to minutes.

Use the hours you actually worked after unpaid breaks. A 9:00 AM to 5:30 PM day with a one-hour unpaid lunch is 8 hours 30 minutes on the clock but 7 hours 30 minutes worked, so it is 30 minutes short of an 8-hour day.

How to use the calculator

Results update as you type. Calculate moves you to the first field that needs fixing. Hours and minutes must be whole numbers, with minutes from 0 to 59. Decimal hours can have fractions, but the calculator drops any fraction of a minute before comparing.

How to compute undertime pay deduction

Once you know the minutes, the deduction is your rate per minute times the undertime minutes. The rate per minute comes from your daily rate.

Let's say you earn ₱20,000 a month on a Monday-to-Friday schedule and left 45 minutes early. Payroll in the Philippines usually turns a monthly salary into a daily rate with a factor: 261 days for a five-day week, 313 for a six-day week, or 365 if you are paid for every day including rest days.

If you are paid ₱700 a day instead, the rate per minute is ₱700 ÷ 8 ÷ 60 = ₱1.4583, and 45 minutes of undertime is about ₱65.63.

The factor matters. Using 365 instead of 261 for the same ₱20,000 salary gives a daily rate of ₱657.53 and a smaller deduction, so ask payroll which factor your company uses. To get the peso figures automatically from your time in and time out, use the DTR Calculator. It also handles late minutes and absences.

Undertime and tardiness in your DTR

Your Daily Time Record usually shows two kinds of missing time. Tardiness is time missed at the start of the day because you came in late. Undertime is time missed at the end because you left early. Many companies add them together on the payslip as "late/undertime", and both are deducted at the same rate per minute.

The lunch break is where hand computations go wrong. If your schedule is 8:00 AM to 5:00 PM with an unpaid lunch from 12:00 to 1:00 and you leave at 12:00, you are not 5 hours short. You are 4 hours short, because the lunch hour was never paid. The same applies when you arrive after lunch.

This calculator works from hours worked, so it already avoids that mistake if you enter net hours. If you only have time in and time out, the DTR Calculator does the break handling for you.

Why extra time on another day does not cancel undertime

For each entry, the calculator converts the requirement to minutes and subtracts the minutes worked. If an entry meets or exceeds the requirement, its undertime is zero. The total is the sum of the entries' shortfalls, so extra time in one entry never cancels missing time in another.

For example, a day with 7 hours worked is 60 minutes short of an 8-hour day. A day with 9 hours worked has zero shortfall. The total is still 60 minutes, not zero.

That matches the rule in the Philippines. Article 88 of the Labor Code says undertime work on any particular day shall not be offset by overtime work on any other day. Your undertime on Monday stays undertime, and approved overtime on Tuesday is still paid as overtime. If your workplace uses a weekly requirement instead, choose 40 hours per week and enter one total per week.

Common mistakes

• Writing 7 hours 30 minutes as 7.30. In decimal hours, 7.30 is 7 hours 18 minutes. Seven and a half hours is 7.5.
• Leaving the unpaid break in. Clock time from 9:00 AM to 5:30 PM is not 8.5 hours worked if lunch is unpaid.
• Mixing days and weeks. One day's hours entered under the 40-hour weekly option creates a large false shortfall.
• Counting lunch on a half day. Leaving at 12:00 on an 8-to-5 schedule is 4 hours of undertime, not 5.
• Using the wrong daily-rate factor. 261, 313 and 365 give different rates per minute for the same monthly salary.

Check the record before valuing missing time

Confirm your scheduled hours, the actual clock record, which breaks are paid or unpaid, any approved leave, and the period your attendance system uses. A 40-hour weekly choice does not set when your workweek starts. The calculator also does not decide whether an absence was authorized or whether the time must still be paid under your contract or local rules.

If you need to value a verified shortfall at an hourly rate, the Undertime Deduction Calculator does that. At 120 per hour, 30 minutes is 0.5 × 120 = 60. That is arithmetic, not permission to deduct 60 from wages. Check the applicable agreement, worker category and law separately.

Questions about undertime

Related calculators

• DTR Calculator

  Get late and undertime minutes and peso deductions straight from time in and time out.

• Timesheet Calculator

  Turn clock punches into net hours worked before checking for undertime.

• Minutes to Decimal Hours Calculator

  Convert 7 h 45 min to 7.75 if your record uses decimal hours.

• Overtime Calculator

  Check the other side: time worked beyond the requirement.