Figures are Gross (before tax, USC, and PRSI). Based on a 52-week year.
function calculateProRata() {
// Get input values
var fullSalary = document.getElementById('fullSalary').value;
var fullHours = document.getElementById('fullHours').value;
var partHours = document.getElementById('partHours').value;
var resultBox = document.getElementById('resultOutput');
// Parse values
var salaryNum = parseFloat(fullSalary);
var fHoursNum = parseFloat(fullHours);
var pHoursNum = parseFloat(partHours);
// Validation
if (isNaN(salaryNum) || isNaN(fHoursNum) || isNaN(pHoursNum)) {
alert("Please enter valid numbers in all fields.");
resultBox.style.display = "none";
return;
}
if (fHoursNum <= 0) {
alert("Standard full-time hours must be greater than 0.");
return;
}
if (pHoursNum 1 unless intended (rare, but mathematically possible if overtime is standard,
// usually capped at 1 for pro-rata definitions, but we will allow the math to flow and just warn if logical oddity).
var proRataAnnual = salaryNum * ratio;
var proRataMonthly = proRataAnnual / 12;
var proRataWeekly = proRataAnnual / 52;
var percentage = ratio * 100;
// Display Results
document.getElementById('resAnnual').innerHTML = "€" + proRataAnnual.toLocaleString('en-IE', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resMonthly').innerHTML = "€" + proRataMonthly.toLocaleString('en-IE', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resWeekly').innerHTML = "€" + proRataWeekly.toLocaleString('en-IE', {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById('resPercent').innerHTML = percentage.toFixed(1) + "%";
// Show result box
resultBox.style.display = "block";
}
Understanding Pro Rata Salary in Ireland
Calculating your earnings when working part-time or reduced hours can be confusing. "Pro rata" is a Latin term meaning "in proportion." In the context of Irish employment, it refers to a salary that is calculated proportionately to a full-time equivalent (FTE) role.
Whether you are moving to a 3-day week, job-sharing, or starting a contract mid-year, this Pro Rata Calculator Ireland helps you estimate your gross income based on your contracted hours versus the company's standard working week.
How the Calculation Works
The math behind pro rata pay is relatively straightforward. It establishes a ratio between your hours and the standard full-time hours, then applies that ratio to the full annual salary.
The formula used is:
(Your Hours ÷ Standard Full-Time Hours) × Full Annual Salary = Pro Rata Salary
Example Scenario
Consider a role in Dublin advertised with a salary of €45,000 pro rata. The standard working week for the company is 40 hours. However, you are contracted to work 24 hours per week (3 days).
Step 1: Divide 24 by 40 to get the ratio (0.6 or 60%).
Step 2: Multiply €45,000 by 0.6.
Result: Your gross annual salary would be €27,000.
Pro Rata Holiday Entitlements in Ireland
Under the Organisation of Working Time Act 1997, part-time workers in Ireland are entitled to the same holidays as full-time workers, calculated on a pro-rata basis. There are three methods to calculate statutory annual leave, but the most common for part-time workers is:
8% Method: You are entitled to 8% of the hours you have worked in the leave year (subject to a maximum of 4 working weeks).
For example, if you work 20 hours a week for 50 weeks (1,000 hours total), your holiday entitlement is 80 hours (1,000 × 8%). This equals 4 weeks of leave based on your 20-hour work week.
Important Considerations for Irish Employees
Standard Hours: In Ireland, the standard full-time working week typically ranges between 37.5 and 40 hours. Always check your contract or the job listing for the specific "Full-Time Equivalent" hours.
Gross vs. Net: The figures provided by this calculator are Gross. This means they are before deductions for Income Tax (PAYE), Universal Social Charge (USC), and Pay Related Social Insurance (PRSI). Your take-home pay will be lower.
Bank Holidays: If you have worked at least 40 hours in the 5 weeks before a public holiday, you are entitled to a day's pay, a paid day off, or an additional day of annual leave, depending on your roster.
Why Use a Pro Rata Calculator?
Job advertisements frequently list the full-time salary to make the role appear more attractive, adding the words "pro rata" in small print. Using this calculator ensures you have realistic expectations of your actual monthly and weekly income before signing a contract.