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Total Hours (HH:MM):
37:30
Total Decimal Hours:
37.50
Note: Calculations subtract break time from the total elapsed time for each day.
How to Calculate Your Work Hours
Managing your time effectively requires an accurate understanding of how many hours you actually spend on the job. A work hour calculator simplifies the process of tracking your daily and weekly output, ensuring you are paid correctly and staying within legal working limits.
The Math Behind Work Hours
To calculate your net work hours, follow this standard formula:
- Step 1: Calculate the elapsed time by subtracting the Start Time from the End Time.
- Step 2: Convert the break time (usually in minutes) into hours.
- Step 3: Subtract the break time from the total elapsed time.
Example: If you start at 8:30 AM and finish at 5:00 PM (17:00) with a 45-minute lunch break:
- Elapsed Time: 17:00 – 8:30 = 8 hours and 30 minutes (8.5 hours).
- Break: 45 minutes = 0.75 hours.
- Net Hours: 8.5 – 0.75 = 7.75 hours.
Decimal Hours vs. Hours and Minutes
Most payroll systems use decimal hours because they make multiplication with hourly rates easier. To convert minutes to decimals, divide the number of minutes by 60. For instance, 15 minutes is 0.25 hours, 30 minutes is 0.50 hours, and 45 minutes is 0.75 hours.
Why Accuracy Matters
Using a tool like this work hour calculator helps employees track overtime and helps freelancers invoice clients with precision. It eliminates the "rounding errors" that often occur when manually estimating time, leading to fairer compensation and better project management.
function calculateWorkHours() {
var grandTotalMinutes = 0;
for (var i = 1; i <= 7; i++) {
var startVal = document.getElementById('start' + i).value;
var endVal = document.getElementById('end' + i).value;
var breakVal = parseFloat(document.getElementById('break' + i).value) || 0;
var rowTotalElement = document.getElementById('rowTotal' + i);
if (startVal && endVal) {
var startParts = startVal.split(':');
var endParts = endVal.split(':');
var startMinutes = (parseInt(startParts[0]) * 60) + parseInt(startParts[1]);
var endMinutes = (parseInt(endParts[0]) * 60) + parseInt(endParts[1]);
// Handle overnight shifts (end time earlier than start time)
if (endMinutes < startMinutes) {
endMinutes += (24 * 60);
}
var elapsedMinutes = endMinutes – startMinutes;
var netMinutes = elapsedMinutes – breakVal;
if (netMinutes < 0) netMinutes = 0;
var rowDecimal = (netMinutes / 60).toFixed(2);
rowTotalElement.innerText = rowDecimal + "h";
grandTotalMinutes += netMinutes;
} else {
rowTotalElement.innerText = "0.00h";
}
}
var totalDecimalHours = grandTotalMinutes / 60;
var finalHH = Math.floor(grandTotalMinutes / 60);
var finalMM = Math.round(grandTotalMinutes % 60);
// Format HH:MM with leading zero for minutes
var formattedMM = finalMM < 10 ? '0' + finalMM : finalMM;
document.getElementById('totalDecimal').innerText = totalDecimalHours.toFixed(2);
document.getElementById('totalTimeHHMM').innerText = finalHH + ":" + formattedMM;
}
// Initial calculation on load
window.onload = calculateWorkHours;