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The subscription calculator uses a thousand employees, two point five weekly hours saved per employee, fifty working weeks, and forty dollars monthly subscription cost per person. That gives one hundred twenty-five thousand annual hours and four hundred eighty thousand dollars of annual fees. The bars use different explicitly labelled units: hours and dollars. These inputs are hypothetical assumptions, not observed productivity or current subscription pricing. Multiplying hours by an entered forty-five-dollar hourly value yields five million six hundred twenty-five thousand dollars of gross economic value. The program does not prove that saved time is productive, realized as cash or achievable for every employee. Subtracting annual fees from the valued hours gives five million one hundred forty-five thousand net economic value. Dividing that net value by four hundred eighty thousand and multiplying by one hundred yields one thousand seventy-one point eight eight percent return after rounding. Bars compare gross and net values at point zero zero zero zero eight pixels per dollar. The large percentage comes from comparing assigned hourly value with relatively small fees; it is not measured profit, a causal study result or a guaranteed return. The quarterly schedule scales these totals linearly by three, six, nine and twelve months, rather than simulating adoption, turnover, training or uneven use. The source payback definition divides annual subscription fees by one twelfth of annual net value. Under the preset this is about one point one months after rounding. This is not the recovery of a separately modeled upfront implementation cost: the numerator is a year of subscription fees and the denominator already subtracts those fees from valued time. When entered weekly hours saved is zero, gross value is zero, net value is negative four hundred eighty thousand and ROI is negative one hundred percent. Payback becomes null and the interface treats it as unprofitable. The second zero-length bar represents that null case, not immediate payback. The native JSON download preserves these exact source definitions and original tool behavior.