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How To Work Out Pro Rata Wage Using The Job Description

Updated: Jun 13

Understanding how to calculate a pro rata wage from a job description is crucial for job seekers navigating the intricacies of employment terms and conditions. Whether you're considering part-time positions, temporary contracts, or roles with varied hours, grasping the concept of pro rata wages ensures that you're accurately assessing the financial implications of different job opportunities. In this guide, we'll delve into the fundamentals of pro rata wage calculations.


What is Pro Rata Wage?

Pro rata wage refers to the proportionate salary or pay that an employee receives based on the number of hours worked relative to a full-time equivalent (FTE) role. It allows for fair compensation regardless of the actual hours worked, ensuring that part-time or temporary employees receive a salary proportionate to their contribution.


Calculating Pro Rata Wage

To calculate pro rata wage from a job description, follow these steps:


Identify Full-Time Equivalent (FTE) Salary: Begin by determining the annual salary or hourly rate specified for a full-time role in the job description. This serves as the benchmark for calculating the pro rata wage.

Determine Work Hours: Next, ascertain the total number of hours per week or month required for the role. This may vary depending on the job description, so be sure to clarify the expected work schedule.

Calculate Pro Rata Ratio: Divide the number of hours you'll be working per week or month by the total full-time hours per week or month (usually 37.5 or 40 hours for full-time roles). This ratio represents the proportion of time you'll be working compared to a full-time employee.

Apply Pro Rata Ratio to FTE Salary: Multiply the pro rata ratio obtained in step 3 by the FTE salary or hourly rate. This calculation yields your pro rata wage, representing the proportionate compensation you'll receive based on your work hours.


Example Scenario:

Let's illustrate the pro rata wage calculation with an example:

*Job Description: Administrative Assistant

*Full-Time Equivalent (FTE) Salary: £25,000 per annum

*Expected Work Hours: 20 hours per week

1. Identify FTE Salary: £25,000 per annum

2. Determine Work Hours: 20 hours per week

3. Calculate Pro Rata Ratio: 20 hours / 37.5 hours (FTE hours per week) = 0.5333

4. Apply Pro Rata Ratio to FTE Salary: £25,000 * 0.5333 = £13,333.25 per annum or £1,111.10 per month (rounded to two decimal places)

In this example, the pro rata wage for the Administrative Assistant role, based on working 20 hours per week, would be approximately £13,333.25 per annum or £1,111.10 per month.


Considerations and Additional Factors

Benefits and Entitlements: When assessing pro rata wages, consider any additional benefits or entitlements offered by the employer, such as holiday pay, pension contributions, or healthcare benefits. These can impact the overall value of the compensation package.

Negotiation and Flexibility: Depending on the employer and the nature of the role, there may be room for negotiation regarding work hours, salary, or other terms. Be prepared to discuss your preferences and negotiate terms that align with your needs and expectations.

Legal Requirements: Ensure that the pro rata wage complies with legal requirements, including minimum wage regulations and employment laws. Familiarise yourself with relevant legislation to safeguard your rights as an employee.


The use of Pro rata in job descriptions can be an absolute pain but by mastering the art of calculating pro rata wages from job descriptions, you can make informed decisions and effectively evaluate different employment opportunities. Whether you're considering part-time roles, temporary contracts, or flexible arrangements, understanding pro rata wages empowers you to assess compensation fairly and accurately.

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