How do I calculate a vacuum cleaner’s total cost?
Three-year cost = purchase + annual consumables × 3 + energy per session × weekly sessions × 52 × 3 × price per kWh.
Session energy should include charging and any dock cycles you want counted. Rated wattage alone does not establish real consumption. If it is unknown, the total stays incomplete.
Compare two scenarios fairly
Keep usage frequency and duration consistent. Change only appliance-specific assumptions. Record consumable references and prices, then check replacement frequency against your actual use.
An appliance may look cheap because a cost was omitted. Zero is valid only when you explicitly choose that assumption; it is never the default for missing data.
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Practical answers
Frequently asked questions
Why are fields not pre-filled by model?
Model-specific annual costs and real energy use are not documented reliably enough. Pre-filling would imply false precision. Enter your own measurements and prices.
Does the result include repairs?
No. Repair frequency and cost are unknown. This scenario covers only the displayed items; it is neither a guaranteed bill nor a lifespan forecast.
What should I do with an unknown value?
Leave the field blank. The calculator flags the missing assumption. Entering zero explicitly chooses to count no expense for that item.