Pro Rata Holiday Pay Calculator

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Pro Rata Holiday Pay Calculator

Standard statutory entitlement is often 28 days (5.6 weeks).
The number of hours a full-time employee works.
The number of hours you work per week.
Please enter valid positive numbers for all fields.
Part-Time Ratio: 0%
Your Holiday Entitlement: 0 Days
Estimated Hours Equivalent: 0 Hours

Understanding Pro Rata Holiday Pay

Pro rata holiday pay ensures that part-time employees receive a fair amount of paid leave relative to their full-time colleagues. If you work fewer hours than a standard full-time week, your holiday entitlement is calculated proportionally based on the hours you work.

How is Pro Rata Holiday Calculated?

The standard formula used by most HR departments and strictly followed by this calculator is based on the "Full-Time Equivalent" (FTE) ratio. The formula is:

(Your Hours / Full-Time Hours) × Full-Time Holiday Entitlement = Your Entitlement

For example, if a full-time employee works 40 hours a week and gets 28 days of holiday, and you work 20 hours a week:

  • Ratio: 20 / 40 = 0.5 (50%)
  • Calculation: 0.5 × 28 days = 14 days

Statutory Minimums

In many jurisdictions, including the UK, there is a statutory minimum holiday entitlement. For example, in the UK, almost all workers are legally entitled to 5.6 weeks' paid holiday a year (known as statutory leave entitlement or annual leave). This equates to 28 days for someone working a 5-day week.

Part-time workers are entitled to the same 5.6 weeks, but this amounts to fewer actual days off because their working week is shorter. This prevents part-time workers from receiving more holiday time proportionally than full-time staff.

Why Calculate in Hours?

While holiday is often booked in days, calculating in hours is sometimes more accurate for employees who work irregular shift patterns or different numbers of hours on different days. Our calculator provides an estimate of your total holiday hours based on your pro rata entitlement.

Bank Holidays

Bank holidays or public holidays are usually included within the statutory entitlement. However, this depends on your specific employment contract. If your place of work is closed on bank holidays and you would normally work that day, you may be required to take it as part of your leave.

Rounding Up

If your calculation results in a fraction of a day (e.g., 14.3 days), employers are not allowed to round this down. It must be kept as a fraction or rounded up, depending on company policy, but never down.

function calculateProRata() { // 1. Get input values var ftEntitlementInput = document.getElementById('ftEntitlement').value; var ftHoursInput = document.getElementById('ftHours').value; var ptHoursInput = document.getElementById('ptHours').value; var resultArea = document.getElementById('result-area'); var errorDisplay = document.getElementById('error-display'); // 2. Parse values to floats var ftDays = parseFloat(ftEntitlementInput); var ftHours = parseFloat(ftHoursInput); var ptHours = parseFloat(ptHoursInput); // 3. Validation Logic if (isNaN(ftDays) || isNaN(ftHours) || isNaN(ptHours) || ftDays <= 0 || ftHours <= 0 || ptHours < 0) { errorDisplay.style.display = 'block'; resultArea.style.display = 'none'; return; } // Hide error if valid errorDisplay.style.display = 'none'; // 4. Perform Calculation // Calculate the ratio (FTE) var ratio = ptHours / ftHours; // Calculate pro rata days var proRataDays = ratio * ftDays; // Calculate estimated hours equivalent // Logic: Entitlement in days / 5 (assuming 5 day basis for full time) * Full Time Hours / 5? // Simpler Logic: The ratio of hours worked determines the total holiday hours. // Total Holiday Hours = (ftDays / 5) * 5? No. // Let's assume the ftDays corresponds to the ftHours. // If ftDays is 28 (5.6 weeks) and ftHours is 40. // Total hours for FT = 5.6 * 40 = 224 hours. // PT hours = 5.6 * ptHours. // However, ftDays might be inclusive of bank holidays. // Standard Hours Calc: (ProRataDays * (ftHours / 5)) assuming 5 day week is the divisor for days. // A safer bet for generic calc is deriving the 'Hours per day' average of a full timer. // Average FT Day = ftHours / 5. // Total Hours = proRataDays * (ftHours / 5). var averageFtDayLength = ftHours / 5; var proRataHours = proRataDays * averageFtDayLength; // 5. Output Results document.getElementById('ratioResult').innerHTML = (ratio * 100).toFixed(1) + '%'; document.getElementById('daysResult').innerHTML = proRataDays.toFixed(1) + ' Days'; document.getElementById('hoursResult').innerHTML = proRataHours.toFixed(1) + ' Hours'; // Show result area resultArea.style.display = 'block'; }

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