The annual salary if you worked 52 weeks a year, full-time.
Usually 37, 37.5, or 40 hours.
Standard school term is often 38, 39, or 40 weeks.
Paid holiday weeks (Statutory minimum in UK is often 5.6).
Annual Pro Rata Salary
0.00
Gross Monthly Pay (Avg)0.00
Gross Weekly Pay (Avg)0.00
Total Paid Weeks0.00
FTE Proportion0%
function calculateProRata() {
// Get inputs
var fteSalary = parseFloat(document.getElementById('fteSalary').value);
var stdHours = parseFloat(document.getElementById('stdHours').value);
var actualHours = parseFloat(document.getElementById('actualHours').value);
var termWeeks = parseFloat(document.getElementById('termWeeks').value);
var holidayWeeks = parseFloat(document.getElementById('holidayWeeks').value);
// Validation
if (isNaN(fteSalary) || isNaN(stdHours) || isNaN(actualHours) || isNaN(termWeeks) || isNaN(holidayWeeks)) {
alert("Please fill in all fields with valid numbers.");
return;
}
if (stdHours <= 0) {
alert("Standard hours must be greater than 0.");
return;
}
// Calculation Logic
// 1. Calculate the Hours Ratio (Part-time hours / Full-time hours)
var hoursRatio = actualHours / stdHours;
// 2. Calculate Total Paid Weeks (Weeks worked + Holiday entitlement)
var totalPaidWeeks = termWeeks + holidayWeeks;
// 3. Calculate Weeks Ratio (Total Paid Weeks / Weeks in a year)
// Note: 52.143 represents 365 / 7 days
var weeksInYear = 52.1428;
var weeksRatio = totalPaidWeeks / weeksInYear;
// 4. Calculate Final Pro Rata Salary
// Formula: FTE Salary * (Actual Hours / Std Hours) * (Total Paid Weeks / 52.143)
var annualProRata = fteSalary * hoursRatio * weeksRatio;
var monthlyPay = annualProRata / 12;
var weeklyPay = annualProRata / weeksInYear;
var proportion = (annualProRata / fteSalary) * 100;
// Display Results
var currencyFormatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD', // Can be changed to GBP or EUR based on user region
minimumFractionDigits: 2
});
// Use generic formatting if currency symbol is not desired, or stick to user input assumption
// For this specific calculator, we'll format with commas and 2 decimals.
document.getElementById('resAnnual').innerHTML = formatMoney(annualProRata);
document.getElementById('resMonthly').innerHTML = formatMoney(monthlyPay);
document.getElementById('resWeekly').innerHTML = formatMoney(weeklyPay);
document.getElementById('resPaidWeeks').innerText = totalPaidWeeks.toFixed(2);
document.getElementById('resProportion').innerText = proportion.toFixed(2) + "%";
document.getElementById('results').style.display = 'block';
}
function formatMoney(amount) {
return amount.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
}
Understanding Term Time Pro Rata Salary
If you work in education or a role tied to the academic calendar, you are likely employed on a "term-time only" basis. This means you do not work the full 52 weeks of the year, but your salary is often annualized and paid in equal monthly installments. Understanding how your paycheck is calculated is essential for financial planning.
What is Pro Rata? "Pro Rata" is Latin for "in proportion." It means your salary is calculated based on a proportion of what a full-time, all-year-round employee would earn.
How the Calculation Works
The term time pro rata salary calculation adjusts the Full-Time Equivalent (FTE) salary based on two main factors: your working hours and your working weeks.
Hours Adjustment: This compares your actual weekly hours to the standard full-time hours (typically 37 or 37.5 hours). If you work 20 hours in a 40-hour role, you earn 50% based on hours alone.
Weeks Adjustment: This compares your paid weeks to the full year (52.14 weeks). Paid weeks include both the weeks you are physically working (e.g., 39 term weeks) and your holiday entitlement.
The standard formula used by most HR departments is:
(FTE Salary) × (Actual Hours ÷ Full Time Hours) × (Total Paid Weeks ÷ 52.143)
Why Include Holiday Weeks?
Even if you only work during school terms, you are legally entitled to paid annual leave. Since you cannot take leave during term time, this pay is usually added to your salary calculation.
For example, if you work 39 weeks, you might be entitled to roughly 5.6 weeks of holiday pay (statutory minimum in many regions). This brings your "Total Paid Weeks" to 44.6 weeks. This total is then used to determine the percentage of the full year salary you receive.
Common Use Cases
Teaching Assistants: Often work 39 weeks per year plus inset days.
School Administration: May work term time plus a few weeks during summer breaks.
University Staff: Sessional lecturers or support staff on academic contracts.
Catering Staff: Employees working only when the canteen is open.
Interpreting Your Result
The Gross Monthly Pay shown in the calculator is an average. Because term-time workers are often paid their annual total in 12 equal monthly payments, this figure represents what you should see on your payslip before taxes and deductions. This ensures you receive a paycheck even during the summer holidays when you aren't working.