Formula: Monthly Electricity Usage = [(Air Purifiers Power Wattage x Daily usage hours)/1000 x 30] kWh month, and
Monthly Electricity Cost = Monthly Electricity Usage x Energy charges per kWh in USD
How to Measure the Volume of a Specific Space?
Multiply length × width × height to measure the volume of a room. A room that is 50 feet long, 40 feet wide, and 20 feet tall is 40,000 feet³ (50× 40 × 20 = 40,000).
Some areas have irregular walls, bent ceilings or other characteristics that render measurement more difficult. Complicated shapes can be broken down into basic shapes to be measured and the results can then be added up to get the sum.
Simply multiply the total area by the average height to get the volume of any shape.