function calculateEarnings() {
// Get input values
var hoursInput = document.getElementById('timeHours').value;
var minutesInput = document.getElementById('timeMinutes').value;
var rateInput = document.getElementById('hourlyRate').value;
// Convert to floats, default to 0 if empty
var hours = parseFloat(hoursInput) || 0;
var minutes = parseFloat(minutesInput) || 0;
var rate = parseFloat(rateInput) || 0;
// Validation: Ensure non-negative numbers
if (hours < 0 || minutes < 0 || rate < 0) {
alert("Please enter positive values for time and rate.");
return;
}
// Logic: Convert minutes to decimal fraction of an hour
var minuteDecimal = minutes / 60;
var totalDecimalHours = hours + minuteDecimal;
// Logic: Calculate total pay
var totalPay = totalDecimalHours * rate;
// Formatting results
var displayDecimalHours = totalDecimalHours.toFixed(4);
var displayTotalPay = totalPay.toFixed(2);
// Update DOM
document.getElementById('res-decimal-hours').innerHTML = displayDecimalHours + " hours";
document.getElementById('res-calculation').innerHTML = displayDecimalHours + " hrs × $" + rate.toFixed(2);
document.getElementById('res-total-pay').innerHTML = "$" + displayTotalPay;
// Show results container
document.getElementById('calc-results').style.display = "block";
}
How to Multiply Time by Hourly Rate
Calculating your total earnings based on time worked can be tricky because time is not decimal by default. There are 60 minutes in an hour, not 100, which means you cannot simply type "8.30" into a calculator to represent 8 hours and 30 minutes. If you do, you will undercharge yourself, as 30 minutes is actually 0.5 hours.
This Multiply Time by Hourly Rate Calculator automates the conversion process for freelancers, contractors, and payroll managers to ensure accurate billing.
The Calculation Formula
To manually calculate your pay, you must first convert your minutes into a decimal format. The formula is:
Total Decimal Hours = Hours + (Minutes / 60)
Once you have the total decimal hours, you multiply that figure by your hourly wage:
Total Pay = Total Decimal Hours × Hourly Rate
Real-World Example
Let's say you worked 5 hours and 45 minutes at a rate of $40.00 per hour.
A common mistake is treating the minute value as the decimal. In the example above, calculating 5.45 × $40 would result in $218.00. By failing to convert 45 minutes to 0.75 hours, you would lose $12.00 on a single invoice. Using this calculator ensures that every minute worked is accounted for correctly in your final pay.
Applications
This tool is essential for:
Freelancers: Generating accurate invoices for clients.
HR & Payroll: processing timesheets for hourly employees.
Consultants: Tracking billable hours with precision.
Contractors: Estimating labor costs for project bids.