What Is Pro Rata Salary?

When you see a job advert offering a pro rata salary, it means the advertised figure is the full-time equivalent (FTE) for that role. If you work part-time, your actual pay will be calculated in proportion to the hours you work. For example, a role advertised as £30,000 pro rata for 3 days a week would pay you three-fifths of that amount, assuming a standard five-day week.

Understanding pro rata salary is essential for comparing job offers, especially when moving between full-time and part-time roles. It also helps when converting an hourly rate into an annual figure, which is a common step for employees on zero-hours contracts or variable shifts.

How to Convert Hourly Rate to Annual Salary

The standard conversion in the UK uses the formula:

Annual salary ≈ hourly rate × contracted hours per week × 52 weeks

For a typical full-time week of 37.5 hours (common in the NHS, civil service, and many office roles), the calculation is:

• £12.21 per hour (National Living Wage 2025) × 37.5 × 52 = £23,809.50 per year
• £19.67 per hour (median full-time hourly earnings, ONS ASHE 2025) × 37.5 × 52 = £38,356.50 per year

Note that the ONS median annual salary of £39,039 is slightly higher because it includes overtime and other payments, and is based on actual hours worked rather than a fixed 37.5-hour week.

If your contract specifies different hours – for example, 40 hours per week in some private sector roles – adjust the multiplier accordingly. Always use your contracted hours, not the hours you actually work if they vary.

UK Earnings Benchmarks from Official Data

The Office for National Statistics (ONS) Annual Survey of Hours and Earnings (ASHE) for April 2025 provides the most authoritative picture of UK pay:

• Median weekly earnings for full-time employees: £766.60
• Median gross annual earnings for full-time employees: £39,039
• Median hourly earnings (excluding overtime) for full-time employees: £19.67

These figures are for employees working more than 30 paid hours per week (or 25+ for teaching). Part-time workers' earnings are typically lower on an annual basis, but their hourly rates may be comparable.

National Living Wage and Minimum Wage Rates

From April 2025, the National Living Wage (NLW) for employees aged 21 and over is £12.21 per hour. For a 37.5-hour week, that equates to roughly £23,810 per year. The National Minimum Wage (NMW) for 18-20 year olds is £10.00 per hour, and for 16-17 year olds it is £7.55 per hour. Apprentices also receive £7.55 per hour (if aged 16-18 or in their first year).

These rates are updated annually, usually in April. The government has committed to increasing the NLW in line with median earnings, so future rates are likely to rise.

NHS Pay Scales as a Real-World Example

The NHS is one of the UK's largest employers and uses clearly defined pay bands. For 2026/27, NHS Employers published the following hourly rates:

• Band 5 (newly qualified nurses, paramedics): entry point £16.40 per hour, rising to £17.69 after experience, and £19.97 at the top of the band.
• Band 6 (specialist nurses, therapists): entry point £20.44 per hour.

These rates include Higher Cost Area Supplements (HCAS) for London and surrounding areas, which add a percentage on top. For example, inner London HCAS is 20% of basic salary (minimum £5,794, maximum £8,746).

NHS Digital's Staff Earnings Estimates for March 2026 show the mean annual basic pay per full-time equivalent (FTE) was £43,595, up 5.3% from the previous year. Mean annual earnings per person (including overtime and other payments) were £44,226.

London Weighting and Geographical Variations

Many roles, especially in the public sector and large private firms, include a London weighting or fringe allowance. This is an additional payment to compensate for higher living costs in the capital. When converting an hourly rate to a pro rata salary, remember to factor in these supplements if they apply. For example, an NHS Band 5 nurse in inner London might earn £16.40 per hour plus HCAS, bringing the effective hourly rate closer to £19.68.

Overtime and Other Payments

The ONS ASHE figures for hourly earnings exclude overtime, while annual earnings include it. If you regularly work overtime, your actual annual income will be higher than the simple hourly-to-annual conversion suggests. Conversely, if you are on a zero-hours contract, your annual income may vary significantly. Always check your contract for overtime rates and guaranteed hours.

Using Our Tools

To quickly convert any hourly rate to an annual or monthly salary, use our Hourly to Salary calculator. You can adjust the hours per week to match your contract. For more detailed comparisons with UK averages, visit our salary data page.

Key Takeaways

• Pro rata salary means your pay is proportional to the full-time hours for the role.
• The standard conversion is hourly rate × hours per week × 52.
• UK median full-time annual salary is £39,039 (ONS ASHE 2025).
• National Living Wage (21+) is £12.21 per hour (2025).
• NHS pay bands provide a clear example of hourly rates and annual equivalents.
• Always consider London weighting, overtime, and deductions when estimating take-home pay.

Frequently Asked Questions

What does pro rata salary mean?

Pro rata salary is the amount a part-time employee earns based on the full-time equivalent (FTE) salary for the role. For example, if a full-time role pays £30,000 for 37.5 hours per week, a part-time employee working 20 hours per week would receive a pro rata salary of (20/37.5) × £30,000 = £16,000 per year. It ensures part-time workers are paid fairly relative to their full-time colleagues.

How do I convert an hourly rate to an annual salary in the UK?

Multiply your hourly rate by the number of contracted hours per week, then by 52 weeks. For a standard full-time week of 37.5 hours, the formula is: hourly rate × 37.5 × 52 = annual salary. For example, £15 per hour × 37.5 × 52 = £29,250 per year. Remember that this assumes no unpaid overtime and a consistent schedule. Use our Hourly to Salary tool for quick conversions.

What is the difference between hourly rate and annual salary for part-time workers?

Part-time workers are usually paid an hourly rate, and their annual salary is calculated pro rata from the full-time equivalent. This means their total pay is proportional to the hours they work. For example, a part-time worker earning £12.21 per hour (National Living Wage) working 20 hours per week would earn roughly £12,698 per year before deductions, whereas a full-time worker on the same rate would earn about £23,810. Always check your contract for the exact hours and any additional allowances like London weighting.