Wasted training spend equals total programme cost — licences plus loaded hourly cost of learner time — multiplied by the disengagement rate. Because it uses budget already committed, it requires no attribution argument, which is why finance teams accept it more readily than an ROI multiple.
Why waste rather than ROI
Most training ROI models ask you to prove that training created value. That requires a counterfactual — what would have happened otherwise — and most L&D teams cannot construct one credibly. The first question from finance is "compared to what?", and the conversation usually ends there.
This calculation asks a narrower question: what proportion of money you have already committed reached people who were not paying attention?
That framing has three advantages.
It uses budget already on the books. You are not asking for money. You are describing what happens to money you already have, which is a different and much easier conversation.
It needs no attribution argument. You do not have to prove training caused a revenue change. Only that a share of a known spend did not land.
Finance can verify most of it. Licence cost, headcount and the loaded hourly rate are all their numbers. The only figure they take from you is the disengagement rate — and if that comes from instrumentation rather than a survey, it holds up.
Where the disengagement rate comes from
This is the input that decides everything, so be honest about its provenance.
If you have engagement data, use it. The proportion of learners whose focus-adjusted time was materially below the content runtime, or who disengaged before a defined threshold.
If you do not, you are estimating, and you should label it as an estimate in any deck. A defensible starting point: compliance training routinely exceeds 90% completion while industry research finds little measurable behaviour change, which implies a substantial gap between finishing and attending.
An estimated disengagement rate presented as a measured one is exactly the kind of number that costs you credibility permanently. If you are estimating, say "we estimate", give the basis, and show the calculation at two or three rates so the reader can see the sensitivity. A CFO who catches one inflated figure discounts every figure you present afterwards.
Using the output
The single sentence at the bottom of the calculator is the one to take into the room. It has the shape finance responds to: a committed cost, a proportion that did not land, and a quantity of paid time.
Pair it with a specific, attributable fix and you have the whole argument:
"Of £132,200 committed to this programme, roughly £50,200 was delivered to people who were not attending. Engagement data showed 61% disengaged during the escalation section. We rewrote it for £3,400. Engagement through that section went from 39% to 74%."
That paragraph does what an ROI multiple cannot: it names a loss, identifies its cause, describes an intervention, and reports a measured result — all in numbers the reader can check.
Frequently asked questions
Why calculate waste instead of ROI?
Where do I get the disengagement rate?
What loaded hourly cost should I use?
Is this a real ROI calculation?
Want a real number instead of an estimate?
Instrument one module and we'll show you the actual disengagement rate on your own content.