This calculator is designed to help you accurately determine your total earnings based on your work hours and hourly pay rate. It accounts for the total time spent at work, subtracts any unpaid breaks, and then calculates your gross pay.
How it Works:
The calculation involves a few key steps:
Calculating Total Time Worked: The calculator first determines the total duration between your start time and end time.
Subtracting Break Time: Any unpaid break time you specify is subtracted from the total time worked to arrive at the actual payable hours. This ensures you are only paid for the time you were actively working.
Calculating Gross Pay: Finally, the payable hours are multiplied by your hourly rate to compute your total gross earnings for the period.
The Math Behind the Calculation:
The core logic uses simple time and arithmetic operations:
Time Difference: The duration between two times (EndTime – StartTime) is calculated. This is typically done by converting both times into minutes (or seconds) from midnight, finding the difference, and then converting back into hours and minutes.
Payable Hours: Total Time Worked (in hours) – Break Duration (in hours). It's crucial to convert the break duration from minutes to hours by dividing by 60.
Total Pay: Payable Hours * Hourly Rate.
For example, if you work from 9:00 AM to 5:00 PM with a 30-minute unpaid break:
Total time from 9:00 to 17:00 is 8 hours.
Break duration is 30 minutes, which is 0.5 hours.
Payable hours = 8 hours – 0.5 hours = 7.5 hours.
If your hourly rate is $20, your total pay would be 7.5 hours * $20/hour = $150.
Use Cases:
This calculator is useful for various individuals and situations:
Employees: To quickly verify their paycheck and understand how their earnings are calculated.
Freelancers & Gig Workers: To accurately bill clients based on logged work hours.
Small Business Owners: To manage payroll and ensure fair compensation for their staff.
Students: To track earnings from part-time jobs.
By providing precise inputs, you can gain a clear understanding of your earnings and manage your finances more effectively.
function calculatePay() {
var hourlyRateInput = document.getElementById("hourlyRate");
var startTimeInput = document.getElementById("startTime");
var endTimeInput = document.getElementById("endTime");
var breakDurationInput = document.getElementById("breakDuration");
var totalHoursSpan = document.getElementById("totalHours");
var payableHoursSpan = document.getElementById("payableHours");
var totalPaySpan = document.getElementById("totalPay");
var hourlyRate = parseFloat(hourlyRateInput.value);
var startTimeStr = startTimeInput.value;
var endTimeStr = endTimeInput.value;
var breakDurationMinutes = parseFloat(breakDurationInput.value);
// — Input Validation —
if (isNaN(hourlyRate) || hourlyRate < 0) {
alert("Please enter a valid hourly rate (a non-negative number).");
return;
}
if (startTimeStr === "" || endTimeStr === "") {
alert("Please select both a start time and an end time.");
return;
}
if (isNaN(breakDurationMinutes) || breakDurationMinutes = startTotalMinutes) {
durationMinutes = endTotalMinutes – startTotalMinutes;
} else {
// Handle overnight shifts (e.g., start 10 PM, end 6 AM)
durationMinutes = (24 * 60 – startTotalMinutes) + endTotalMinutes;
}
var totalHours = durationMinutes / 60;
var breakDurationHours = breakDurationMinutes / 60;
var payableHours = totalHours – breakDurationHours;
// Ensure payable hours are not negative if break is longer than worked time
if (payableHours < 0) {
payableHours = 0;
}
var totalPay = payableHours * hourlyRate;
// — Display Results —
totalHoursSpan.textContent = totalHours.toFixed(2);
payableHoursSpan.textContent = payableHours.toFixed(2);
totalPaySpan.textContent = "$" + totalPay.toFixed(2);
}