Filament cost — Calculated as (weight used ÷ 1000) × price per kg. Accuracy depends on your slicer's gram estimate; use the Filament Estimator to get a weight estimate if you haven't sliced yet. Electricity cost — Calculated as print hours × (watts ÷ 1000) × rate per kWh. Actual draw varies by phase (heating, printing, standby); 150 W is a reasonable average for a standard FDM printer. Check your utility bill for the correct rate — US average is ~$0.13/kWh but varies widely by state and country.