Your scenario
Monthly hours saved = weekly hours × 52 ÷ 12 × saving rate. Their value uses your hourly cost. Net monthly value subtracts recurring costs; setup is paid at month zero. ROI = cumulative net value ÷ total setup and recurring cost. Constant savings and costs; time value is not necessarily a cash saving.
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Scenario chart
Cumulative net value
The table contains the exact plotted values. Change an input and calculate again to compare scenarios.