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What does a drying session cost?
Change the assumptions to match your setup. Electricity use is easier to compare when the calculation is visible.
$0.12
Estimated session electricity cost · $0.12 per spool · 0.60 kWh
Use measured average power where possible. Nameplate wattage produces a constant-power scenario and may overestimate cycling equipment. This excludes the dryer purchase, taxes, standing charges, and other printing costs.
The calculation
Watts ÷ 1,000 × hours × electricity rate gives the estimated cost. Divide that result by the number of spools in the same cycle for an equal per-spool allocation. It does not measure the efficiency of a particular dryer.
Use a realistic power figure
Heaters can cycle, and fans or controls use power too. A plug-in meter suitable for the device and local electrical supply can record actual energy over a complete cycle. If you enter the rated maximum instead, label the result as a scenario. Do not shorten a required material drying cycle simply to lower the estimate.