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Payback (ROI) calculator for a vision inspection station

Four figures in rand, a base and a conservative case, and every step of the working shown.

Technical review: Frank GuoReviewed

// Short answer

This calculator estimates the simple payback and annual return of an inspection station from four figures you enter: the avoidable quality cost per year, the labour saving you can actually realise, the extra running cost, and the one-off installed investment. It shows each step. The result is a scenario estimate from your inputs, not a promise of savings, and it ignores financing, tax, discounting and ramp-up.

// Calculator

Calculate payback with your own figures

Amounts in rand (R). Spaces or commas between thousands are fine. No email or contact details are needed.

Your figures

Scrap, rework, returns and customer claims you can trace to the faults the station would catch. Count each defective batch once.

Only inspection labour cost that actually goes away. Moving a person to other work is not a cash saving unless the cost stops.

Support agreement, spare parts, cleaning and reference-check time, and licence renewals if any.

The full installed cost: station, integration, PLC and reject work, installation, FAT and SAT, and training.

// Before you enter figures
  • Do not count the same defective batch twice, as scrap, rework and a return.
  • Redeploying a person is not a cash saving unless the cost actually goes away.
  • Do not treat a rare worst-case recall as a yearly saving; weigh it separately.
Conservative case

Applied to the quality cost and labour saving; the running cost always counts in full. It starts at the same value as the base case: lower it to see a cautious case. Leave it empty to match the base case.

Clear all figures

Scenario estimate from your inputs — not a promise of savings; ignores financing, tax, discounting and ramp-up.

Your result appears here

Enter all four figures and press Calculate. Use 0 where a figure genuinely does not apply. No email or contact details are needed.

// Method

How the calculation works

The same simple method as in the cost and budget guide, with each step shown.

Annual net benefit = avoidable quality cost + realisable labour saving − annual extra running costSimple payback (months) = installed investment ÷ annual net benefit × 12Simple annual ROI (%) = annual net benefit ÷ installed investment × 100
  • All amounts are in rand (ZAR). The savings and the running cost are per year; the investment is one-off.
  • Each amount is rounded to the nearest rand. Payback is rounded to one decimal month and ROI to a whole percent, half up.
  • Payback and ROI are shown only when both the annual net benefit and the investment are above zero. If a figure is missing, no result is shown, because a guess would look like an answer.
  • The conservative case counts only the share you choose of the quality cost and labour saving; the running cost is counted in full. Until you change it, the share matches the base case.
  • The method ignores financing, tax, discounting, inflation, ramp-up after commissioning and any residual value.
// What to count

Which savings belong in the figures

Conservative inputs you can defend to your finance team are worth more than a short payback that nobody believes.

Do not count

  • The same batch twice. A defective batch that is scrapped is not also a rework cost and a customer return.
  • Redeployed people as cash. Moving an inspector to other work saves money only if a cost really stops.
  • A rare worst-case recall as a yearly saving. Weigh the risk of a recall separately; it is not an annual figure.
  • Faults a camera cannot see. Internal defects, leak tightness and anything behind opaque material are outside a vision check.

Do count

  • Traceable scrap and rework. Material and labour spent on faulty product that the station would stop earlier.
  • Returns and customer claims. Credit notes, penalties, freight and handling you can trace to the faults in question.
  • Labour cost that goes away. For example overtime or a contracted sorting service that ends.
  • The running cost in full. Support, spare parts, cleaning and reference-check time, and licence renewals if any.
// FAQ

Payback questions

When does a machine vision inspection station pay for itself?
When the annual net benefit is above zero and the installed investment is recovered within a period your business accepts. The net benefit is the avoidable quality cost plus the labour saving you can really realise, minus the running cost. We do not publish typical payback periods: they depend on your defect costs and on the scope of the station, so use your own traceable figures here.
What counts as avoidable quality cost?
The cost of faults the station would catch before the product leaves: scrap, rework, returns, customer claims and extra sorting that you can trace to those faults. Count each defective batch once. If you are not sure how many of those faults a camera would catch, test a lower share in the conservative case; a sample test on your own parts shows which faults are visible.
Why does the calculator ignore financing, tax and discounting?
It is a simple first screen that shows the working in plain steps. A capital request usually also needs your cost of capital, depreciation, tax treatment and the ramp-up period after commissioning, while recipes and thresholds settle. Your finance team can take the same inputs into its own model.
Should a product recall be included in the savings?
Not as a yearly figure. A rare worst-case recall is a risk to weigh separately, not an annual saving. If you have a history of traceable claims or returns caused by the faults in question, those belong in the avoidable quality cost.
Are the figures I enter stored?
The calculator does not ask for an email or any contact details, and your figures are not added to any enquiry. They travel in the page address, so you can bookmark or share a result; like any page address, they can appear in ordinary web server logs. If you want us to see them, copy the summary into the assessment form.
Related:
Cost & budget guide →How we deliver a project →How to prepare inspection samples →
// Next step

Check the savings side against your own samples

The savings in this calculation depend on which faults a camera can actually see on your product. A sample test answers that before any proposal or quotation.

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