Two days a week is one of the most common part-time patterns in the UK. It suits parents sharing childcare, students, semi-retired workers, and anyone running a freelance sideline next to a steady job. But when the advert quotes a full-time salary and the offer letter says “pro rata”, it is natural to wonder what your payslip will actually look like. A pro rata salary calculator for 2 days a week removes that uncertainty.
This guide covers the full calculation for the UK: the formula, worked examples with real pound figures, how bank holidays and annual leave are pro-rated on two days, the pension and National Insurance picture at these earnings, and the one mistake that catches part-timers out more than any other.
Pro Rata Salary Calculator for 2 Days a Week: The Quick Answer
If you work 2 days a week of standard 7.5-hour days, you work 15 of the full-time 37.5 hours — 0.4 of a full-time equivalent (FTE). Your pro rata salary is the full-time salary multiplied by 0.4. On a £28,000 full-time salary, a pro rata salary calculator for 2 days a week gives £11,200 a year gross, or £933.33 a month. On £35,000 full-time, it gives £14,000 a year, or £1,166.67 a month. Bank holiday and annual leave entitlements shrink by the same 0.4 fraction.
Remember the headline numbers: two standard days out of five = 0.4 FTE = 40% of the full-time package. If your working days are longer or shorter than a full-time day, the hours matter more than the day count, as the mistakes section below explains.
What Does 2 Days a Week Mean in Hours?
Before any calculation, pin down two numbers from your contract: how many hours your two working days are, and what “full-time” means at your employer. Full-time is not fixed by UK law. Most offices, councils, and public-sector roles treat 37.5 hours as full-time. Many private-sector employers use 37.5 or 40, and shift or care work can define it differently again.
Say your contract has you working Tuesday and Wednesday, 9am to 5pm with a half-hour lunch, against a 37.5-hour full-time week. That is 15 hours against 37.5 — a fraction of 0.4. But if your two days are 10 hours each against that same 37.5-hour week, your fraction is 20 ÷ 37.5 = 0.533, and a flat 0.4 multiplier would underpay you by over £3,700 a year on a £28,000 salary.
The day count only works as a shortcut when your days match a full-time day in length. Always calculate in hours; it is the one version that cannot be disputed.
How to Use the Pro Rata Salary Calculator for 2 Days a Week Formula
The formula behind every pro rata salary calculator for 2 days a week fits on one line:
Pro rata salary = full-time salary × (your weekly hours ÷ full-time weekly hours)
In plain steps:
- Take the full-time annual salary, for example £28,000.
- Divide your weekly hours by the full-time weekly hours: 15 ÷ 37.5 = 0.4.
- Multiply the salary by that fraction: £28,000 × 0.4 = £11,200.
- Divide by 12 for monthly gross: £11,200 ÷ 12 = £933.33.
- Divide the annual figure by 52 for weekly gross: £11,200 ÷ 52 = £215.38.
The same maths converts an hourly rate into weekly pay: hourly rate × your weekly hours = gross weekly pay. A £14.50 hourly rate at 15 hours a week is £217.50 a week. To check any figure in this guide, run it through our free pro rata salary calculator — it applies the same formula instantly.
Worked Examples: What 2 Days a Week Pays
The table below assumes standard 7.5-hour days and a 37.5-hour full-time week, so 2 days = 0.4 FTE. Figures are gross, before tax, National Insurance, and pension deductions.
| Full-time salary | 2-day pro rata salary | Monthly gross | Weekly gross |
|---|---|---|---|
| £22,000 | £8,800 | £733.33 | £169.23 |
| £25,000 | £10,000 | £833.33 | £192.31 |
| £28,000 | £11,200 | £933.33 | £215.38 |
| £32,000 | £12,800 | £1,066.67 | £246.15 |
| £35,000 | £14,000 | £1,166.67 | £269.23 |
| £40,000 | £16,000 | £1,333.33 | £307.69 |
| £45,000 | £18,000 | £1,500.00 | £346.15 |
Take the £28,000 row: 15 ÷ 37.5 = 0.4, then £28,000 × 0.4 = £11,200 a year, £933.33 a month, £215.38 a week. The £35,000 row follows the same path: £35,000 × 0.4 = £14,000 a year, £1,166.67 a month, £269.23 a week.
Notice the hourly rate stays constant whatever the pattern. £28,000 over a 37.5-hour week means £28,000 ÷ (37.5 × 52) = £14.36 an hour. Your 15 hours at £14.36 is £215.38 a week — the same answer from the other direction. That consistency is the whole point of pro rating: equal pay per hour for the same job.
If your employer quotes an hourly rate instead of an annual salary, the maths is even shorter: hourly rate × 15 = weekly pay, then × 52 ÷ 12 for the monthly figure. A £13.00 hourly rate means £195 a week and £845 a month before deductions.
Bank Holidays When You Work 2 Days a Week
This is where two-day-a-week workers most often feel short-changed, and where the rules are actually on their side. A full-time employee in England and Wales gets the 8 standard bank holidays off, or a day in lieu or extra pay when they work one. If your two days are Wednesday and Thursday, you will almost never catch a bank holiday, while a Monday-to-Friday colleague enjoys them as free days off.
The fair solution, widely used across UK employers and reflected in ACAS guidance, is to pro-rate the bank holiday entitlement: 8 days × 0.4 = 3.2 days of paid bank-holiday leave, or 8 × 7.5 × 0.4 = 24 hours a year. If a bank holiday falls on a working day, it comes out of this allowance; if it falls on a day you never work, you still hold those 24 hours to use as extra paid leave elsewhere. Either way, you get the same 3.2 days as every other 0.4-FTE colleague.
Check which system your contract uses before you sign. Some employers simply give part-timers bank holidays off when they coincide with working days and nothing otherwise — an arrangement that quietly penalises anyone whose days avoid Mondays.
Your Holiday Entitlement on 2 Days a Week
Statutory minimum annual leave in the UK is 5.6 weeks a year for a full-time worker — 28 days at a five-day week. For part-timers it shrinks by the FTE fraction. At 0.4 FTE: 5.6 weeks × 0.4 = 2.24 weeks, or in days, 28 × 0.4 = 11.2 days. Many employers round up to a full 12 days rather than asking staff to book 0.2 of a day, but the legal minimum is the unrounded 11.2.
Be clear about what the 5.6 weeks includes. If your employer counts bank holidays inside it, your 3.2-day bank holiday allowance sits within the 11.2 days, leaving 8 days of ordinary leave. If the employer gives bank holidays on top — the more generous and common practice — you get the full 11.2 days plus the 3.2-day bank holiday allowance. “28 days including bank holidays” and “28 days plus bank holidays” are two very different deals at any FTE, so read the exact wording.
Part-timers accrue holiday like everyone else, and unused statutory leave cannot simply be cancelled at year end without giving you a chance to take it. Start or leave mid-year and the 11.2 days are pro-rated again by the months worked.
Pension and National Insurance at 2 Days a Week Pay
At £11,200 a year you sit below the personal allowance and the National Insurance primary threshold, both £12,570 for the 2026/27 tax year. No income tax, no employee National Insurance — the full gross reaches you, minus only pension. It is a handy feature of the two-day pattern at typical salaries: the tax system barely touches you.
Pensions work differently, because automatic enrolment triggers at £10,000 of earnings. £11,200 clears that bar, so your employer must enrol you unless you opt out. The standard minimum is 8% of qualifying earnings — employer at least 3%, you the rest — which on £11,200 costs a few dozen pounds a month from your pay, more than doubling once the employer contribution and tax relief join it.
One caution at the lower examples: £8,800 a year falls below the £10,000 auto-enrolment trigger, but you are still above the £6,240 lower limit of the qualifying earnings band, so you can ask to be enrolled and the employer must comply and contribute. Below about £6,396 a year you may also stop earning qualifying years towards the State Pension automatically, though voluntary credits can fill the gap. Figures are illustrative for 2026 — verify against current thresholds if anything on your payslip looks off.
Common Mistakes: Day-Counting vs Hour-Counting
The single most common error is counting days instead of hours. “Two days is 2/5, so 0.4” only holds when your working day matches a full-time day in length. Three situations break it.
First, compressed hours: two 10-hour days is 20 hours, or 20 ÷ 37.5 = 0.533 FTE — not 0.4. Second, long-shift roles in care or hospitality, where a “day” can be 12 hours: two 12-hour shifts is 24 hours, or 0.64 FTE against 37.5. Third, unpaid lunch: if full-time staff work 8am to 4:30pm with an hour unpaid, their day is 7.5 paid hours; if your two days run 9 to 5 with the same unpaid hour, you are at 14 hours against their 37.5 — 0.373, not 0.4.
The fix is always the same: agree the fraction in hours and get it written into your offer letter, then check the first payslip against it. A second common mistake is accepting a round-number salary without asking whether it is the pro rata figure or the FTE figure. “£14,000 for two days a week” and “£35,000 FTE, pro rata” are the same offer — but read the first as the FTE figure and you will expect far more than arrives.
Finally, the overtime trap: many employers pay part-timers extra hours at the standard hourly rate up to full-time hours, with premium overtime only beyond that. Know which rule your employer applies before agreeing to cover extra days.
Other working patterns: 20 hours a week · 24 hours a week · 30 hours a week · 37.5-hour week · 40-hour week · 3 days a week · 4 days a week · 37.5 vs 40 hours · part-time hours tables · pro rata hours · days vs hours · examples by days per week
Frequently Asked Questions
Is 2 days a week 0.4 FTE? Usually, yes, when full-time is a 5-day, 37.5 or 40-hour week and your two days are standard-length days. It becomes a different fraction whenever your days are longer or shorter, so confirm the hours.
What is £30,000 pro rata for 2 days a week? On the standard 0.4 fraction it is £12,000 a year gross, £1,000 a month, and £230.77 a week. Longer days push the figure higher.
Do I get bank holidays off working 2 days a week? You get a pro-rated entitlement of 3.2 days (24 hours) of paid bank-holiday leave a year. Bank holidays on working days come from that allowance; those on your days off cost you nothing.
How many holiday days do I get on 2 days a week? The statutory minimum is 11.2 days a year including bank holidays, at 0.4 FTE. Many employers round up to 12, and many give bank holidays on top rather than inside the minimum.
Will I pay tax on £11,200 a year? No income tax and no employee National Insurance, with both thresholds at £12,570 for 2026/27. You will normally still be auto-enrolled in the workplace pension, as £11,200 exceeds the £10,000 trigger. Thresholds are illustrative; check the current year.
Two days a week is a genuinely good deal when the pro rata maths is done properly: equal hourly pay, a fair share of bank holidays and leave, and in many cases no tax or National Insurance at all. The only thing standing between you and that outcome is making sure the hours — not just the day count — are written down and honoured. When in doubt, run the numbers through a pro rata salary calculator for 2 days a week before you sign anything.