You’re Probably Looking at the Wrong Number on Your Contract
Job adverts for school-based roles almost always quote the full-time equivalent salary — not what you’ll actually take home. A posting might say £29,000 per year, but if the role is term time only at 30 hours a week against a 37-hour full-time standard, the real figure is considerably lower. That’s not a trick. It’s just how pro rata term time pay works. But if nobody explains it clearly, it can feel like one.
The problem is that two separate ratios are at work at the same time. Your pay is reduced once because you work fewer weeks than a full-year employee, and again because your weekly hours may be below full-time. Both reductions are legitimate. Neither is applied arbitrarily. But you need to know how to calculate pro rata salary term time correctly to verify that a contract reflects what was agreed.
That’s exactly what this tool does — it applies both ratios in the correct order and shows you the breakdown so nothing is hidden.
Running the Numbers: A Guide to Using This Calculator Accurately
Getting an accurate result means knowing which figures to use for each field. Most people get the salary right but stumble on the weeks or hours inputs. Here’s how to approach each one.
Filling In the Calculator Correctly
- Full-time equivalent salary: this is the advertised or contract salary expressed as if the role were worked full-time for the whole year. Even if you’ve been given a reduced figure already, try to find the FTE figure first — you can always verify the reduced figure by running it through the calculator in reverse.
- Your contracted hours per week: check your contract, not your rota. Rotas can vary week to week; your contracted hours are fixed and are the figure that feeds into the calculation.
- Full-time weekly hours for the role: this is the hours figure the employer uses to define full-time. For many UK school roles it’s 37 hours, but some are 35 or 36. If you’re not sure, HR will confirm it.
- Weeks you work per year: count your actual contracted working weeks including any INSET days or training days. Do not include unpaid holiday or closure weeks you don’t work.
- Total weeks in the year: leave this at 52 unless your employer specifies otherwise in writing.
- Holiday entitlement: enter the full-time entitlement in days. The calculator will scale it down to your pro rata entitlement automatically.
- Choose your preferred output — annual, monthly, weekly, or daily — then calculate.
Understanding the Two-Ratio Formula
The term time only pro rata calculation is built on two sequential ratios. They’re multiplied together, not added, which is why leaving one out gives you a significantly wrong answer.
How the Hours Ratio and Weeks Ratio Interact
The hours ratio is your contracted hours divided by the full-time hours. The weeks ratio is your working weeks divided by the total weeks in the year. Multiply the full-time salary by both and you have the correct term-time pro rata salary. This is the approach recommended by payroll bodies and used by most school HR departments across the UK. Investopedia’s overview of how pro rata calculations work describes the same proportional principle applied across finance and employment contexts.
A Real Numbers Walkthrough
Full-time salary: £32,000. Contracted hours: 25 per week. Full-time hours: 37 per week. Working weeks: 38 (term time only). Total weeks: 52.
Hours ratio: 25 ÷ 37 = 0.6757. Weeks ratio: 38 ÷ 52 = 0.7308. Pro rata annual salary: £32,000 × 0.6757 × 0.7308 = £15,803. Monthly: £1,317. The full-time salary on the job advert was more than double the actual take-home annual figure.
Where People Go Wrong With Term-Time Pay Calculations
Confusing Term Time Only With Part-Time
Part-time and term time only are different contract types that often overlap but don’t have to. A part-time employee works reduced hours across the full year. A term-time only employee may work full hours during term but doesn’t work during school holidays. Many roles are both — part-time hours and term time only. The calculator handles all three combinations because both ratios are independent inputs.
Using the Reduced Salary Instead of the FTE Salary as the Starting Point
If HR has already given you a reduced salary figure, don’t use that as your starting input and then reduce it further. Always start from the full-time equivalent. If you’re unsure what the FTE salary is, ask specifically for the “full-time equivalent annual salary” for the grade and pay point your role sits on.
Forgetting That Monthly Pay Includes Holiday Periods
Term-time staff at most schools are paid in 12 equal monthly instalments rather than being paid only in the weeks they work. This means the monthly figure from this calculator is what you receive every month of the year — including August. The total annual amount is the same either way; it’s just distributed differently. Wikipedia’s entry on how salary payment structures work explains the difference between pay periods and employment periods clearly.
Getting the Holiday Entitlement Figure Right
Why Your Pro Rata Holiday Is Less Than You Might Expect
Your term-time holiday entitlement is reduced by both the weeks ratio and the hours ratio, exactly like your salary. So if the full-time entitlement is 28 days and your combined ratio is 0.49, your pro rata entitlement is around 13.7 days. Many term-time workers assume their holidays fall within the school holiday periods automatically, but statutory entitlement still needs to be formally allocated even for term-time roles.
Common Questions About Term Time Pro Rata Pay
How do I know if my employer has calculated my salary correctly?
Run the calculation yourself using the full-time equivalent salary, your exact contracted hours, and your confirmed working weeks. If the result you get is meaningfully different from the figure in your contract, ask HR to show their calculation. Employers are not required to publish the formula they use, but they are required to pay correctly. A written request for the calculation breakdown is reasonable and professional.
What is the difference between term time only and part-year working?
Term time only is a specific contract type tied to school or academic term dates. Part-year working is a broader term that includes any arrangement where the employee works less than the full calendar year. Both are calculated using the same proportional approach, but term time only contracts usually have a fixed, agreed number of working weeks defined by the school calendar.
Can I use this calculator if I work in a nursery or early years setting?
Yes. The formula is the same regardless of the educational setting. Nurseries, early years providers, and independent schools all use the same hours and weeks ratios. Enter your actual contracted weeks and hours for your setting and the result will be accurate.
Does the calculator account for National Living Wage compliance?
The calculator shows your pro rata salary. To check National Living Wage compliance, divide the resulting weekly pay by your contracted hours to get an effective hourly rate. If that rate falls below the current National Living Wage, your employer is legally required to increase your pay to meet the minimum. Check the current rate with HMRC before comparing.
My contract shows a salary in the job description but a lower amount in the offer letter — which one do I use?
Use the figure described as the full-time equivalent or FTE salary. Job descriptions usually quote the FTE figure to make the role seem comparable to full-time positions. The offer letter should show the actual pro rata amount you will be paid. You can verify the offer letter figure by entering the FTE salary into this calculator with your exact hours and weeks.
How is a term-time salary handled differently for tax purposes?
Your term-time pro rata salary is treated exactly the same as any other employment income for tax purposes. HMRC taxes your actual earnings regardless of whether you work term time or full year. If your monthly pay is consistent across 12 months, your tax code is applied as normal each month. There is no separate tax treatment for term-time workers.
Can I use this for a zero-hours term time role?
Zero-hours contracts by definition have no fixed contracted hours, which means the hours ratio cannot be calculated with certainty. If your zero-hours arrangement has a typical or guaranteed minimum hours figure in writing, use that as your contracted hours input to get an indicative result. Otherwise this calculator reflects contracted employment rather than variable-hours arrangements.
What if my school counts INSET days differently from teaching weeks?
Add INSET days or directed time to your total working weeks. If your school runs 38 teaching weeks plus five INSET days, those five days represent one additional working week — so enter 39 as your working weeks total. If INSET days are split across terms, count partial weeks as fractions (e.g. 3 INSET days = 0.6 of a week) and add that to your base figure.
What Do You Do After You Get Your Result?
Compare it directly to the salary figure in your contract or offer letter. If both figures match, your employer has applied the standard formula correctly. If there’s a discrepancy of more than a few pence (rounding aside), document both figures and raise it with HR — showing your inputs and the calculator result. Most payroll errors on term-time contracts are genuine mistakes rather than deliberate underpayment, and they get corrected quickly when flagged with clear evidence.