A pay rate calculator is an essential tool for both employees and human resource professionals. Whether you are negotiating a new job offer or trying to understand how a raise affects your take-home pay, converting between hourly rates and annual salaries is the first step in financial planning.
How to Calculate Gross Pay
Gross pay is the total amount of money earned before taxes and other deductions are taken out. To calculate your gross pay manually, use the following formulas:
Hourly to Annual: Hourly Rate × Hours per Week × 52 Weeks.
Salary to Hourly: Annual Salary ÷ 52 Weeks ÷ Hours per Week.
If you earn $30 per hour and work a standard 40-hour week with no overtime, your calculation would be:
Weekly Pay: $30 × 40 = $1,200
Bi-weekly Pay (ADP standard): $1,200 × 2 = $2,400
Annual Gross: $1,200 × 52 = $62,400
Why Use an ADP-Style Pay Calculator?
ADP is one of the world's largest payroll providers. Their systems typically use standardized pay frequencies (like bi-weekly or semi-monthly) to process checks. Using a calculator that mimics these frequencies helps you align your personal budget with your employer's payroll cycle. Note that this calculator provides gross pay; your final "net" paycheck will be lower after federal/state taxes, Social Security, and benefit deductions are applied.
function toggleInputs() {
var payType = document.getElementById('payType').value;
var rateLabel = document.getElementById('rateLabel');
var hoursGroup = document.getElementById('hoursGroup');
var otHoursGroup = document.getElementById('otHoursGroup');
var otRateGroup = document.getElementById('otRateGroup');
if (payType === 'salary') {
rateLabel.innerHTML = 'Annual Salary ($)';
document.getElementById('rateValue').placeholder = 'e.g. 52000';
hoursGroup.style.display = 'flex';
otHoursGroup.style.display = 'none';
otRateGroup.style.display = 'none';
} else {
rateLabel.innerHTML = 'Hourly Pay ($)';
document.getElementById('rateValue').placeholder = 'e.g. 25.00';
hoursGroup.style.display = 'flex';
otHoursGroup.style.display = 'flex';
otRateGroup.style.display = 'flex';
}
}
function calculateADPPay() {
var payType = document.getElementById('payType').value;
var rate = parseFloat(document.getElementById('rateValue').value);
var hours = parseFloat(document.getElementById('hoursPerWeek').value);
var freq = parseFloat(document.getElementById('payFrequency').value);
var otHours = parseFloat(document.getElementById('otHours').value) || 0;
var otMult = parseFloat(document.getElementById('otMultiplier').value) || 1.5;
if (isNaN(rate) || rate <= 0) {
alert('Please enter a valid pay rate.');
return;
}
var annualGross = 0;
var periodGross = 0;
var monthlyGross = 0;
var hourlyEquiv = 0;
if (payType === 'hourly') {
var weeklyBase = rate * hours;
var weeklyOT = (rate * otMult) * otHours;
var totalWeekly = weeklyBase + weeklyOT;
annualGross = totalWeekly * 52;
periodGross = annualGross / freq;
monthlyGross = annualGross / 12;
hourlyEquiv = rate;
} else {
// Salary calculation
annualGross = rate;
periodGross = annualGross / freq;
monthlyGross = annualGross / 12;
hourlyEquiv = annualGross / (hours * 52);
}
// Update UI
document.getElementById('periodGross').innerHTML = '$' + periodGross.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('monthlyGross').innerHTML = '$' + monthlyGross.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('annualGross').innerHTML = '$' + annualGross.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('equivHourly').innerHTML = '$' + hourlyEquiv.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('payResults').style.display = 'block';
}