How to Calculate Robot ROI: A Real Factory Math Example

Our friends in Binh Duong ran a simple math exercise before buying their first robot. We are sharing it because it is the most honest ROI example we have seen in years-no spreadsheet magic, no optimistic assumptions, just real numbers from a real factory that already had the receipt.

They employed two palletizing operators on day shift and one on night shift. Loaded cost per operator, including social charges, insurance, overtime, and a small turnover allowance, came to about $650 per month. Three operators meant $1,950 per month, or $23,400 per year. That is the number they started with. It is the number most factories never actually calculate-they just know labor is expensive.

A refurbished ABB IRB 4600 with a gripper and basic integration came in at $28,000. It replaced two operators; they kept one to supervise and run the forklift. Monthly savings were $1,300, which is $15,600 per year. Payback landed at about 22 months. After that point, every dollar the robot saved was pure profit. The robot does not call in sick on Monday, does not demand a raise, and does not quit for a competitor after eight months.

But here is the part most ROI calculators miss. There are hidden savings that do not show up in the labor line. Less product damage from inconsistent manual handling-their damage rate dropped from 3% to under 0.5%. Faster, repeatable cycles that squeezed an extra hour out of every shift. And a number their CFO actually trusts, because it came from their own floor, not a vendor's slide deck. When you add these, payback actually came in closer to 18 months.

Our view? Most factories underestimate ROI by ignoring consistency. A human worker has good days and bad days; a robot has neither. Over a year, that consistency adds up to 5 to 10 percent extra output that never appears in the initial business case. It also reduces the argument with the night shift supervisor, which is worth more than people admit.

The danger on the other side is overestimating ROI. If a vendor promises a 6-month payback on a $50,000 cell, ask to see the assumptions. The sweet spot for refurbished automation is 12 to 24 months. Anything faster is suspicious; anything slower needs a strategic reason beyond pure payback, like quality improvement or customer requirement.

Below we lay out the full ROI math as a table you can copy and adjust with your own numbers. Then we answer the four ROI questions we get every week. Want us to run your numbers? Send us your shift pattern, current labor cost, and the part you want handled. We will estimate payback in 24 hours, with conservative assumptions you can take to your accountant.

Table 1 - The Binh Duong ROI, year by year

Table 2 - Payback by application (refurbished)

Frequently Asked Questions

Q: What labor cost should I use?
A: Use loaded cost: wage + social insurance + overtime + turnover. Usually 1.3x the base wage.

Q: Do you count the operator who supervises?
A: Yes, keep one supervisor. We subtract that from the saving. We do not pretend the robot replaces everyone.

Q: What about electricity and maintenance?
A: Budget 5-8% of the robot price per year. We include this in the table if you ask.

Q: Can I write this off for tax?
A: Yes in most countries; talk to your accountant. Refurbished equipment often qualifies for accelerated depreciation.

Customized Need Analysis: Customized need analysis: send us your shift pattern, loaded labor cost, and monthly output. We will build a conservative ROI table with your numbers, including the supervisor you keep and the maintenance budget. No rosy assumptions.

Call to Action: Send us your shift pattern and labor cost; we will build a conservative ROI table for your line in a day, free.

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