Formula
Pro rata = full-time salary × your hours ÷ full-time hours (× weeks worked ÷ 52 for part-year roles). Holiday entitlement is pro-rated the same way.
FAQ
What is £36,000 pro rata for 22.5 hours?
£21,600 at a 37.5-hour full-time week.
Sources (checked 6 Nov 2026): ACAS part-time workers guidance.