How Pro Rata Salary Is Calculated

A pro rata salary is calculated by determining your Full-Time Equivalent (FTE) proportion based on the fraction of standard hours worked:

FTE = Part-Time Weekly Hours ÷ Full-Time Weekly Hours
Pro Rata Annual Salary = Full-Time Annual Salary × FTE × (Weeks Worked ÷ 52)
WORKED EXAMPLE

If a role is advertised at £40,000 full-time (based on a standard 37.5-hour week) and you agree to work 22.5 hours per week over 52 weeks:

• FTE proportion = 22.5 ÷ 37.5 = 0.60 (60%)

• Pro Rata Annual Salary = £40,000 × 0.60 = £24,000 gross per year

• Monthly Gross Pay = £24,000 ÷ 12 = £2,000.00 gross per month

• Hourly Equivalent = £40,000 ÷ (37.5 × 52) = £20.51 per hour

Frequently Asked Questions

Does pro rata salary include tax and National Insurance?

No. Pro rata salaries are quoted gross (before income tax, employee National Insurance, and pension contributions). Because the UK personal allowance (£12,570) is fixed regardless of hours worked, part-time workers often take home a larger percentage of their gross pay compared to full-time colleagues.

How is term-time only pro rata pay calculated?

For school support staff and educators working term-time only (typically 38 or 39 weeks per year), your pro rata salary factors in both reduced weekly hours and reduced weeks worked, plus statutory accrued holiday pay. Adjust the "Weeks Worked / Year" field to your contractual weeks.

Are part-time workers legally entitled to equal benefits?

Under the UK Part-time Workers (Prevention of Less Favourable Treatment) Regulations, part-time employees must receive the same hourly pay, pension access, training opportunities, and pro-rata annual leave as comparable full-time staff.