⚖️ Pro Rata Salary Calculator (Part-Time Pay)

Going part-time or switching to a 4-day week? See your new salary.

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Fill in the details and click Calculate to see your results.

Formula at a glance

Pro Rata Salary Calculator: Pro-rata salary — full-time salary × your hours ÷ full-time hours. Example: £40,000 job at 22.5 of 37.5 hours → Pro-rata salary: £24,000
How the Pro Rata Salary Calculator works: Pro-rata salary — full-time salary × your hours ÷ full-time hours

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📘 About the Pro Rata Salary Calculator

A pro-rata salary is the full-time salary scaled to the hours you work: 22.5 hours of a 37.5-hour week is 60% (0.6 FTE), so a £40,000 job pays £24,000.

If you start or leave part-way through a year, multiply by the share of the year you work. Holiday entitlement and many benefits are pro-rated too.

🧮 Formula

Pro-rata salary
full-time salary × your hours ÷ full-time hours

✏️ Worked examples

£40,000 job at 22.5 of 37.5 hours

You enter
Full-time salary40000
Full-time hours a week37.5 hours
Your hours a week22.5 hours
Part of the year only?No
Currency£ Pound
You get
Pro-rata salary£24,000
Per month£2,000.00
FTE0.6 (60%)
Hourly rate (same for both)£20.51

£24,000.

$60,000 on a 4-day week (32 of 40 hours)

You enter
Full-time salary60000
Full-time hours a week40 hours
Your hours a week32 hours
Part of the year only?No
Currency$ Dollar
You get
Pro-rata salary$48,000
Per month$4,000.00
FTE0.8 (80%)
Hourly rate (same for both)$28.85

$48,000.

🧭 How to use this calculator

What you enter

  • Full-time salary
  • Full-time hours a week (hours)
  • Your hours a week (hours)
  • Part of the year only?
  • Start date
  • End date
  • Currency

What you get

  • Pro-rata salary
  • Per month
  • FTE
  • Hourly rate (same for both)

❓ Frequently asked questions

What does pro rata mean?

In proportion — a part-time salary is paid in proportion to the hours compared with full time.

What is FTE?

Full-time equivalent: your hours ÷ full-time hours. 3 days of 5 is 0.6 FTE.

Is a 4-day week pay cut 20%?

If hours fall from 40 to 32 with the same hourly rate, yes; under "100-80-100" schemes pay stays the same.

Is part-time take-home pay pro-rata?

Not exactly — tax allowances are not scaled, so part-timers keep a larger share of their pay.