Interview to Offer Ratio
Also known as Interviews per Hire, Interview Efficiency
Interview to offer ratio is the number of candidates interviewed for each offer extended. It measures selection efficiency — how well earlier stages are filtering — and it directly determines how much interviewer time each hire consumes.
Formula
Interview to Offer Ratio = Candidates interviewed ÷ Offers extendedDistinguish first-round interviews from final-stage panels. A 6:1 first-round ratio is normal; a 6:1 final-stage ratio means the earlier stages are not filtering.
Worked example
- Scenario
- 42 candidates interviewed, 9 offers extended.
- Calculation
- 42 ÷ 9
- Result
- 4.7:1 interview to offer ratio
What good looks like
Ratios of roughly 3:1 to 5:1 are common overall. Above about 6:1, screening is letting through candidates who were never going to succeed, which is an expensive way to filter. Below 2:1 can indicate the opposite problem — over-filtering that is rejecting viable candidates before anyone speaks to them.
Why interview to offer ratio matters
Interviewing is the most expensive stage in hiring because it consumes senior time. A ratio of 8:1 across a 150-hire year represents an enormous amount of interviewer capacity spent on candidates who were identifiable as unsuitable earlier. Improving screening is nearly always cheaper than adding interview capacity.
How to improve it
- 1Check where unsuccessful candidates are failing. If they consistently fail on a criterion that could be screened earlier, move it earlier.
- 2Use structured screening against defined criteria rather than CV impression.
- 3Compare the ratio by recruiter and by source to find which pipelines are pre-qualified and which are not.
- 4Read alongside quality of hire — a very low ratio with weak hire quality means you are choosing from too small a pool.
Common mistakes
- Optimising the ratio downward without watching hire quality, which can mean interviewing too few people to choose well.
- Mixing first-round and final-stage interviews in one figure.
- Comparing across role families with genuinely different assessment needs.
Frequently asked questions
How many candidates should we interview per hire?
Three to five is a common and healthy range. Consistently above six suggests screening is not filtering effectively; below two suggests the pool is too small for a genuine choice, which tends to show up later as weaker quality of hire.
Related metrics
Recruitment funnel conversion rate is the percentage of candidates progressing from one hiring stage to the next. Read stage by stage it shows exactly where your pipeline narrows, which is what turns a general 'we need more candidates' instinct into a specific fix.
Quality of HireQuality of hire is a composite measure of how well new hires perform and how long they stay, typically combining early performance rating, ramp speed, retention and hiring-manager satisfaction. It is the metric that tells you whether recruiting is producing good hires rather than just fast, cheap ones.
Time to HireTime to hire measures the days between a candidate entering your pipeline and accepting an offer. It is a candidate-experience and process-efficiency metric, and it is distinct from time to fill, which starts when the role is approved rather than when the candidate applies.
Cost per HireCost per hire is the total internal and external recruiting spend divided by the number of hires in a period. It is the standard efficiency measure for talent acquisition and the basis for comparing sourcing channels against each other.
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