Packaging labor automation model

What this calculator models

This tool is a labor-only screening model for packaging automation. It converts an entered production pattern and labor-time difference into annual units, annual labor hours saved, net annual modeled benefit, simple payback and a stress-case annual benefit. It does not model material savings, throughput gains, capacity, integration effort, training, financing, taxes or other cash effects. Use it to compare assumptions and see which inputs drive the modeled result, not as a complete investment case.

Operating volume inputs

Units per day is the base daily output. Operating days per week and operating weeks per year define the annual operating pattern. Annual units are the product of those three entries. If the line runs a partial week or a partial year, enter the actual fraction rather than rounding. Changing days or weeks scales annual units, hours saved and gross labor value in proportion, holding per-unit time and uptime fixed. Net annual modeled benefit also subtracts the same annual maintenance amount.

Labor time and residual work

Manual seconds per operator per unit is the time one operator spends on the task before automation. Manual operators is the count of operators performing that task. Automated residual person-seconds per unit is the remaining human time per unit after automation. The model subtracts residual person-time from manual person-time, then applies uptime. A higher residual value reduces saved time per unit directly; adding operators increases manual person-time before the subtraction. Enter time in seconds per unit, not minutes or hours.

Uptime and stress case

Uptime is the share of scheduled production time in which the automation is available. The model weights saved person-time by this percentage; the remainder is treated as falling back to the original manual task. Stress-test volume is a percentage of base volume used only for the stress-case benefit. It scales the saved labor-hour value, while annual maintenance remains subtracted in full. A lower stress percentage moves the stress-case benefit toward the result with no gross labor value, which is negative annual maintenance or zero if maintenance is zero. It leaves annual units, hours saved, net annual benefit and simple payback unchanged.

Cost inputs and payback logic

Loaded labor hourly rate, installed investment and annual maintenance are your own quote entries. The model multiplies saved hours by the loaded rate, then subtracts annual maintenance to produce net annual modeled benefit. Simple payback divides installed investment by that net benefit and converts the result to months. If installed investment is zero, the payback row asks you to enter it rather than showing a zero-month result. With a positive installed investment, zero or negative net annual modeled benefit gives No positive payback. These are user-entered scenario values, not market rates.

Worked example: two entered scenarios

Starting scenario. With 5,000 units per day, 5 operating days per week, 50 operating weeks per year, 6 manual seconds per operator per unit, 2 operators, 1 residual person-second per unit, 90 percent uptime and zero wage, investment and maintenance, the model shows 1,250,000 annual units and 3,437.5 annual labor hours saved. Net annual modeled benefit is $0.00 because the loaded rate is zero. Simple payback displays Enter installed investment because investment is zero. Stress-case annual benefit is $0.00.

Changed scenario. With 1,000 units per day, 5 operating days per week, 50 operating weeks per year, 6 manual seconds per operator per unit, 2 operators, 2 residual person-seconds per unit, 90 percent uptime, 67 percent stress-test volume, $20 loaded rate, $10,000 installed investment and $1,000 annual maintenance, the model shows 250,000 annual units and 625 annual labor hours saved. Net annual modeled benefit is $11,500.00, simple payback is 10.43 months and stress-case annual benefit is $7,375.00. The higher residual value and lower volume reduce hours saved; the entered wage creates gross labor value, maintenance reduces it, and investment produces the payback result.

Reading outputs and edge cases

Annual labor hours saved is a modeled time quantity, not a headcount decision. Net annual modeled benefit is the dollar result after the entered maintenance charge. Stress-case annual benefit uses the stress percentage on the saved hours value and still subtracts maintenance. With zero wage, both benefit rows equal negative annual maintenance, or zero if maintenance is also zero. Residual person-time above manual seconds multiplied by operators produces negative saved hours when uptime is positive; the model does not clamp that result to zero. Maintenance exceeding gross labor value makes net benefit negative. With a positive installed investment, zero or negative net benefit displays No positive payback; zero investment instead displays Enter installed investment.

Limits of the labor-only model

The result is a screening estimate. Released hours are not necessarily cash savings; they may be redeployed, absorbed or offset by new work. Integration, training, throughput, financing, taxes, material changes and capacity constraints require a fuller investment case. The stress case is a sensitivity check on the entered volume percentage, not a guarantee of performance. Use the outputs to frame questions and compare your own assumptions, then validate with engineering and finance review.

Questions about packaging labor automation model