Calculate your total work hours, including regular and overtime, considering your lunch breaks.
Your Work Hours Summary:
Total Hours Worked: –:–
Regular Hours: –:–
Overtime Hours: –:–
Understanding Your Time Card Calculation
Accurately tracking work hours is crucial for both employees and employers. This calculator simplifies the process by accounting for clock-in, clock-out times, and designated unpaid lunch breaks. It helps determine your total hours worked, distinguishing between regular and overtime pay based on a defined threshold.
How the Calculation Works
The calculator performs the following steps:
Parse Time Inputs: It takes the provided clock-in, lunch start, lunch end, and clock-out times.
Calculate Total Duration: It determines the total duration from clock-in to clock-out.
Calculate Lunch Break Duration: It calculates the duration of the unpaid lunch break (from lunch start to lunch end).
Calculate Net Work Time: The lunch break duration is subtracted from the total duration to get the actual net hours worked.
Determine Regular and Overtime Hours:
The Regular Hours Threshold (commonly 8 hours for an 8-hour workday) is used.
If Net Work Time is less than or equal to the threshold, all hours are considered regular.
If Net Work Time exceeds the threshold, the hours up to the threshold are marked as regular, and the remaining hours are calculated as overtime.
Key Terms Explained:
Clock In: The time you begin your work shift.
Lunch Start/End: The times marking the beginning and end of your unpaid lunch break. This duration is deducted from your total time at work.
Clock Out: The time you finish your work shift.
Regular Hours Threshold: The maximum number of hours considered standard for a work day before overtime pay applies.
Total Hours Worked: The gross duration from clock-in to clock-out, *before* subtracting lunch.
Net Work Time (Implicitly Calculated): Total Hours Worked minus the Lunch Break Duration. This is the basis for calculating regular and overtime.
Regular Hours: The hours worked up to the defined Regular Hours Threshold.
Overtime Hours: The hours worked beyond the Regular Hours Threshold.
Why Use This Calculator?
This tool is ideal for:
Employees verifying their pay stubs.
Freelancers and contractors tracking billable hours.
Small business owners ensuring accurate payroll.
Anyone needing a quick and precise way to calculate work time with breaks.
By providing accurate inputs, you can gain a clear understanding of your earned work hours and ensure you are compensated fairly.
function calculateHours() {
var clockInStr = document.getElementById("clockIn").value;
var lunchStartStr = document.getElementById("lunchStart").value;
var lunchEndStr = document.getElementById("lunchEnd").value;
var clockOutStr = document.getElementById("clockOut").value;
var regularHoursThreshold = parseFloat(document.getElementById("regularHoursThreshold").value);
// Clear previous results
document.getElementById("totalHours").textContent = "–:–";
document.getElementById("regularHours").textContent = "–:–";
document.getElementById("overtimeHours").textContent = "–:–";
if (!clockInStr || !lunchStartStr || !lunchEndStr || !clockOutStr || isNaN(regularHoursThreshold) || regularHoursThreshold <= 0) {
alert("Please fill in all time fields and ensure a valid positive number for the regular hours threshold.");
return;
}
var parseTime = function(timeStr) {
var parts = timeStr.split(':');
return parseInt(parts[0]) * 60 + parseInt(parts[1]); // Time in minutes
};
var formatTime = function(minutes) {
var hours = Math.floor(minutes / 60);
var mins = minutes % 60;
return String(hours).padStart(2, '0') + ':' + String(mins).padStart(2, '0');
};
var clockInMinutes = parseTime(clockInStr);
var lunchStartMinutes = parseTime(lunchStartStr);
var lunchEndMinutes = parseTime(lunchEndStr);
var clockOutMinutes = parseTime(clockOutStr);
// Handle cases where clock out is on the next day (e.g., shifts ending after midnight)
if (clockOutMinutes < clockInMinutes) {
clockOutMinutes += 24 * 60; // Add minutes for a full day
}
// Handle cases where lunch times might span midnight relative to clock in/out (less common but possible)
// This simple calculator assumes lunch happens within the same work day span.
// More complex logic would be needed for shifts crossing midnight AND lunch crossing midnight.
if (lunchEndMinutes < lunchStartMinutes) {
// Assuming lunch break is within the same calendar day as its start time
// and does not span past midnight if the entire shift doesn't.
// If clockOut is same day as clockIn, and lunchEnd = clockInMinutes && lunchEndMinutes lunchStartMinutes) {
lunchBreakMinutes = lunchEndMinutes – lunchStartMinutes;
}
} else if (lunchStartMinutes clockInMinutes && lunchEndMinutes = clockInMinutes && lunchStartMinutes clockOutMinutes) {
// Lunch starts within shift but ends after clock-out
lunchBreakMinutes = clockOutMinutes – lunchStartMinutes;
}
var netWorkMinutes = totalMinutesWorked – lunchBreakMinutes;
if (netWorkMinutes < 0) netWorkMinutes = 0; // Cannot have negative net work time
var regularHoursThresholdMinutes = regularHoursThreshold * 60;
var regularMinutes = Math.min(netWorkMinutes, regularHoursThresholdMinutes);
var overtimeMinutes = Math.max(0, netWorkMinutes – regularHoursThresholdMinutes);
document.getElementById("totalHours").textContent = formatTime(totalMinutesWorked);
document.getElementById("regularHours").textContent = formatTime(regularMinutes);
document.getElementById("overtimeHours").textContent = formatTime(overtimeMinutes);
}