Source of Hire Calculator: Cost Per Hire and Share by Channel

What does source of hire measure?

Source of hire shows where your hires come from: job boards, employee referrals, agencies, direct sourcing, your careers site, internal moves and so on. On its own it is a count. It becomes useful when you put spend next to it, because then you can see what each channel costs per hire and decide where the next dollar should go.

Applications are the wrong unit for this metric. Job boards almost always send the most applicants, which makes them look like the best channel if you count volume. Count hires, and ideally hires who are still employed and rated well a year later, and the ranking often changes.

This calculator compares three common sources. Add a fourth by running the numbers twice, or swap the labels in your own spreadsheet for whatever channels you use.

How do you calculate source of hire step by step?

1. Make source a required field in your ATS, with a fixed list of options, so every candidate is tagged when they enter the pipeline.
2. At the end of the period, export hires with their source.
3. Count hires per source and divide each count by total hires to get the share of hires.
4. Add up spend per source for the same period: posting fees, subscriptions, referral bonuses, agency fees and the share of recruiter time spent on direct sourcing if you track it.
5. Divide spend by hires for each source to get cost per hire by source.
6. Add all spend and divide by all hires for a blended cost per hire across these channels.

What does a source of hire example look like?

A team made 30 hires last year: 18 from job boards, 8 from referrals and 4 from agencies. It spent 27,000 dollars on job boards, 16,000 dollars on referral bonuses and 72,000 dollars in agency fees. These are illustrative numbers.

Job boards brought 60% of hires at 1,500 dollars each. Referrals brought 27% at 2,000 dollars each. Agencies brought 13% at 18,000 dollars each. The blended cost across the three is about 3,833 dollars per hire. The agency line is the expensive one, so the next question is which roles needed an agency and whether those roles could be sourced in house.

Which hiring sources perform best?

Published ATS data consistently shows that inbound volume and hires do not line up. Gem's 2025 benchmarks, covering January 2021 to December 2024, found job boards and social sites produced 49.0% of applications but only 24.6% of hires. Gem's 2026 report, using a broader group of job boards plus company marketing channels, says those channels bring roughly 90% of applications but about half of hires, while direct sourcing delivers 11% of hires from 2.6% of applications. The two reports group channels differently, so read them as the same pattern rather than one trend.

Ashby's referrals report, covering over 38 million applications from 2021 to 2024, shows the same gap at each stage. Referred candidates went from application to interview 40% of the time, and agency and internal candidates 42% of the time, far more often than inbound applicants. From interview to offer, internal candidates converted at 32%, referrals at 16% and agency candidates at 8%, with sourced and inbound candidates converting less often still.

For cost per hire across all sources, SHRM's 2025 benchmarking puts the average at 5,475 dollars for nonexecutive roles and 35,879 dollars for executive roles. Use your blended number from the calculator to compare.

How do you add a fourth source or more?

The calculator compares three channels at a time because that keeps the inputs short. To compare a fourth, such as direct sourcing or your careers site, run it a second time with that channel in one of the slots and note the blended figure from each run. In a spreadsheet, the same two formulas extend to any number of rows.

For direct sourcing, the spend line is mostly recruiter time plus any sourcing tool subscriptions. Estimate the hours spent sourcing per hire, multiply by a loaded hourly cost for the recruiter and add the tool cost for the period. Without that, sourcing looks free and agencies look expensive, which leads to the wrong decisions.

For internal mobility, the spend is usually close to zero, but the hire still creates a vacancy behind it. Report internal moves as a source and track the backfill separately so the true effect is visible.

How do you use source of hire to spend smarter?

• Rank sources by cost per hire and by quality of hire together. A cheap source with high early turnover is not cheap.
• Move budget in small steps. Shift 10% to 20% of spend toward the best performing source for a quarter, then measure again.
• Promote referrals for hard roles. Share the open roles with employees directly and pay the bonus quickly.
• Use agencies for the roles where they earn their fee, such as senior or niche searches, and track their cost per hire separately from contingent volume hiring.
• Rediscover past candidates in your ATS before you pay for new ones.

What mistakes should you avoid?

• Letting candidates self report source on an application form with a free text box. You end up with forty spellings of LinkedIn.
• Crediting the last touch only. A candidate who saw a job ad and then got referred should be tagged by your rule, written down once.
• Leaving recruiter time out of direct sourcing costs, which makes sourcing look free.
• Comparing sources on applicants instead of hires.
• Drawing conclusions from one or two hires per source. Wait for enough volume or combine periods.