A guide to human resource metrics

Key takeaways:

• Human resource metrics describe your workforce and HR processes, while KPIs are selected metrics tied to specific goals.

• Workforce metrics such as headcount, FTEs and employee distribution show different dimensions of staffing.

• Recruitment metrics can help you track hiring speed, cost and offer acceptance.

• Onboarding and retention metrics are most useful when they rely on clear, objective definitions and consistent calculations.

• Reliable HR metrics require good documentation, consistent measurement and regular reporting.

Human resource metrics vs. KPIs: What’s the difference?

Two terms get used a lot when talking about human resource strategy: metrics and KPIs. While they’re closely related, it’s important to understand the distinction between them.

Human resource metrics describe your HR processes and workforce. They can range from the number of employees to have to what it costs to hire someone to how long it takes to onboard new team members. 

KPIs are metrics. But not just any metrics. They’re the specific metrics you’ve chosen to assess your progress toward your goals. Take for example a company that is trying to reduce turnover. One of their HR metrics might be length of employment. They choose to track this metric as one of their KPIs toward decreasing their turnover rate. 

Read more >> Manufacturing KPIs for better financial and workforce decisions

In this article, we’ll focus on general human resource metrics, explaining exactly what they measure  and how to  best calculate them. By then end, you’ll have a strong menu of metrics to turn to when you need to pick KPIs for a specific opportunity or challenge.

Workforce size and composition

Let’s start with workforce size and composition. These human resource metrics track how many people work for you, their working hours, and how you’ve organized your workforce across your company.

Headcount

Headcount is the number of employees working for your company on any given date. To calculate it, count each person once, regardless of how many hours they work each week. A good way to track this is with an employee roster.

Full-time equivalents (FTEs)

This metric shows you your staffing capacity expressed in full-time units (typically a standard 40-hour work week). So, for example, if you have two employees working 20 hours per week each and your full-time week is 40 hours, then those two employees equal one FTE. 

Employee distribution

Employee distribution lets you see how your workforce is distributed across departments, roles, full-time/part-time, office locations, or any other dimension you’d like to track. To calculate employee distribution for any given dimension, count the number of employees in that cohort and divide by your total headcount then multiply by 100. So, for example, if you have 100 employees, and 20 of them work in your Portland location, then 20% of your employees work in Portland.

Recruitment metrics

The number of human resource metrics focused on recruitment is staggering,  but you can get a strong start focusing on these three. 

Time to fill

Especially in fast moving industries like manufacturing and construction where new contracts often depend on new hires, tracking time to fill lets you know how long it will take you to bring on the labor you need to fulfill a new project. 

Dive deeper >> Futureproof your business with our workforce capacity planning guide

Cost per hire

Cost per hire is the average recruitment cost for each new hire. It isn’t the new hire’s salary, but rather recruiting costs, including the recruiter’s compensation, job ad listings, agency fees, background checks and any other hiring-related expense. Choose the period you want to calculate (a year for example), add up all the expenses and divide by the number of new hires. Your result is your cost per hire.  For example, if you spent $20,000 in 2025 on recruiting new hires, and you hired 20 employees during the year, then your cost per hire is $1,000. 

Offer acceptance rate

This human resource metric defines the percentage of your job offers candidates accept. Let’s say that in Q1, you offered 10 candidates positions. Eight accepted. Your offer acceptance rate for Q1 would be 80%. 

Onboarding metrics

Once someone joins your team, it’s helpful to track if they stay and how long it takes for them to get up to speed in their new role.

First-90-day retention

Ninety days is a good benchmark for a new employee settling in successfully. Typically first-90-day retention is tracked as a percentage. Choose a time period ending at least 90 days ago. Count the total number of hires during that period. Then count how many of those hires stayed at least 90 days. The hires that stayed divided by the total number of hires is your first-90-day retention rate. If you hired 20 employees in June, and 15 stayed at least 90 days, then you have a 75% first-90-day retention rate for June. 

Time to proficiency

This metric requires a concrete definition of proficiency for each role you’re tracking. For example, you might define proficiency for a worker on an automotive arts line as when they can

• complete their assigned operation within the standard cycle time for at least 95% of units over five consecutive shifts;

• maintain a first-pass yield of at least 98%;

• pass a supervisor observation successfully

• Demonstrate required PPE use

This human resources metric is only useful if it has an objective definition. Relying on managers to subjectively say when a new hire has reached proficiency is not a reliable metric. 

Retention and employee experience metrics

Retention and employee experience metrics measure how long employees are staying with your company and give you insight into employee satisfaction and engagement.

Employee turnover

This metric is really a category. Splitting out voluntary turnover (resignations) from involuntary turnover (terminations or layoffs) helps you differentiate employee satisfaction problems from employee performance problems. Employee turnover is typically measured by defining a period, counting how many employees left during that period, and then dividing that number by the average number of employees during that period and multiplying by 100. For example, if in February you had an average of 100 employees and 5 people resigned, you had a 5% voluntary turnover rate in February.

Employee engagement scores

This metric has a lot of flexibility built into it. Basically, you measure employee engagement scores by surveying employees with consistent questions and measuring the responses across a defined time period. So, for example, if you asked employees at the end of 2024 if they felt satisfied with your company’s health benefits and 80% said yes, and then at the end of 2025, only 70% said yes, you could say that your employee engagement score for health benefit satisfaction dropped by 10%. 

One thing to keep in mind with this metric is that it is only as robust as the number of employees who participate in the survey. If only 10 percent of employees respond, for example, it would be wise to be cautious using that metric as a foundation for policy change since it might or might not represent the view of the other 90 percent of employees.

Keeping human resource metrics reliable

When it comes to reliable metrics, you want to keep two main things in mind: consistency and clarity. Everyone using the metrics needs to understand clearly how each metric is defined and how it’s calculated. And then that metric needs to be measured consistently over an extended period of time.

This means keeping good documentation that’s updated regularly. Define your calculation method for each metric and note any records that are required as supporting documentation. Assigning responsibility for tracking each metric will support long term success. 

Keep good notes about the numbers underlying the metric as well. A 20% turnover in a department of 5 people is a very different signal than a 20% turnover in a plant with 500 employees. 

Finally, establish a regular reporting schedule. Your metrics are only as valuable as how easily your leadership team can access and assess them! 

Wondering where to start?

Aerial helps high-growth and transitioning companies establish strong human resource metrics to support strategic decision making. Whether you need someone to come in and help define policies and procedures around metrics tracking, help you analyze the results of already collected data or set tailored KPIs for future goals, our team can help! 

Schedule a call with one of our human resource experts today to learn how we can help.