Knowledge · Leadership & Organization

ROI · Return on Investment

Return on Investment

📂Leadership & Organization⏱2-min read📊Beginner🔗5 related

What is ROI?

In one line
A metric that expresses, as a percentage, how much profit an investment returned relative to its cost (Return on Investment). It is the common language of investment decisions, from training to marketing.
⚡ Summary in 3 lines
  • Return relative to investment, as a percentage
  • How profit and cost are defined is the heart of the calculation
  • Its short-term, quantitative bias needs offsetting

Once you start using ROI, the order of training planning flips. Instead of hunting for results after a course ends, you have to pin down, when writing the proposal, 'which number this training will move, and by how much,' or the calculation won’t hold up later. Putting the success metric ahead of training design is the real change ROI brings to the workplace. So adopting ROI is less about memorizing a formula than about building into the organization a process for agreeing on target numbers with line managers.

In practice, ROI is paired with BCR (benefit-cost ratio). BCR is benefit divided by cost, so 1.0 is break-even, which as ROI is 0%. A BCR of 3.0 is an ROI of 200%, not 300% — it means you spent KRW 1 (≈ US$1) and got back KRW 3, (≈ US$1) for a net gain of KRW 2 (≈ US$1). A report that confuses the two gets flagged right away in finance review. Also, while ROA and ROE look at the financial statements as a whole, ROI can be broken down to the level of an individual project. Marketing’s ROAS doesn’t subtract cost of goods from revenue, so it always comes out higher than ROI.

Under the Phillips model, training ROI is persuasive when roughly three conditions hold. Count benefits for one year at most and leave out anything beyond that, because assumptions snowball as the period grows. Include in costs not only instructor fees but also design effort and the converted labor cost of participants’ time. And don’t force a dollar value onto things that can’t be monetized, such as a better collaborative atmosphere; report them separately as “intangible results.”

In practice, ROI almost always breaks down at 'isolating the effect.' If you credit the entire post-training sales increase to training, one executive remark — "Isn’t that because of the new product?" — destroys the whole report’s credibility. It’s also common to inflate ROI by leaving participant labor costs out of the cost, but the moment finance back-calculates working hours, the training team’s numbers are doubted all year. Trying to put an ROI on every course is risky too. Measurement often costs more than the training itself, so it’s more realistic to use ROI only for the few courses whose results come down to numbers and to defend leadership and organizational culture courses with qualitative metrics from the start.

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💡 In plain English
It’s like weighing the cost of the seed against the harvest to judge whether the farming year was a success.
Why it matters in practice
For training managers, ROI is the strongest language for presenting training as an “investment” rather than a “cost” and for securing budget.
⚠️ Common misconceptions
There’s a misconception that 'ROI is a number only the finance team uses,' but its logic is a common language across every department, including training and marketing. However, it can’t capture qualitative value, so it shouldn’t be treated as a catch-all metric.
🧮 Formula
ROI (%) = (Net profit − Investment cost) ÷ Investment cost × 100
For example, if you invest KRW 10 million (≈ US$7,480) in sales training and the profit attributed to the training comes to KRW 14 (≈ US$1) million, ROI is (14 million − 10 million) ÷ 10 million × 100 = 40% (hypothetical example).
Origin and sources

The idea of judging profit against investment is old, but ROI as a management metric is said to have spread through DuPont analysis, the financial framework that US company DuPont developed in the early 20th century to evaluate business unit performance. In training, Jack Phillips established the methodology of converting training results into monetary value to calculate ROI.

Source · DuPont financial analysis framework and Jack J. Phillips's training ROI methodology · View original
An example

Consider a hypothetical case: Company A, an auto-parts manufacturer with 420 employees. Annual quality-claim handling costs had swelled to KRW 800 (≈ US$1) million, and next year’s training budget was slated for a 30% cut. The training team had to prove the value of quality training in numbers within six months.

  1. At the planning stage, the training manager met with the head of quality assurance and locked in the training goal as a number: cut the process defect rate from 2.1% to 1.5% within six months. They got it signed into the meeting minutes.
  2. Total cost wasn’t limited to the KRW 18 million (≈ US$13,500) instructor fee and KRW 4 million (≈ US$2,990) for materials and operations. Adding KRW 32 million (≈ US$23,900) as the labor-cost equivalent of 120 participants’ 16 hours, it came to KRW 54 million (≈ US$40,400).
  3. Six months later the defect rate had dropped to 1.4%, but equipment had also been replaced in the same period, so the training team lead asked 12 floor line leaders, "What percentage of this improvement would you credit to the training?" and accepted only the average of 60%.
  4. A 0.7 percentage-point drop in the defect rate meant KRW 240 million (≈ US$179,600) saved in claims and rework costs. Only KRW 144 (≈ US$1) million, that figure multiplied by the 60% contribution rate, was counted as the benefit of training.
  5. The report stated ROI of 167% along with the caveat, word for word, that 'the 60% contribution rate is an estimate based on a survey of 12 line leaders,' and the CFO said, "I trust that caveat more than the number."
  6. The following year, the quality training budget came off the cut list and actually grew by KRW 12 million (≈ US$8,980). From then on, Company A made a 'target metric and contribution-rate estimation method' field mandatory in every course proposal.
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Last updated 13 Sep 2026 · Reviewed by John Kim

FAQ

ROI is based on 'profit,' while ROAS (return on ad spend) is based on 'revenue' relative to ad spend. Even with a high ROAS, ROI can be negative if margins are low, so look at both metrics together.
Jack Phillips's training ROI model is the best known. Building on Kirkpatrick's four levels of reaction, learning, application, and results, Level 5 converts results into monetary value and compares them with total training cost to calculate ROI. Isolating the effects of non-training factors is the key step.
Not necessarily. ROI doesn’t reflect investment period, risk, or scale, so small, short-term investments can look better than they are. Judge it alongside time-adjusted metrics and qualitative assessment.
No. Converting results to monetary value takes considerable cost and effort, so the general recommendation is to apply ROI evaluation only to the few strategically important courses. For the rest, evaluating satisfaction, learning, and on-the-job application is enough.