Housecleaning companies generally calculate costs for cleaning commercial offices or residential homes either on a per-square-foot basis or per hour. An average cleaning time per square foot allows you to estimate the time needed for cleaning and hence the total cleaning costs if a contractor charges per hour/minute. Use a stopwatch and calculator to compute minutes of a cleaning task per square foot.

- Skill level:
- Easy

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### Things you need

- Measuring tape
- Stopwatch
- Calculator

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## Instructions

- 1
Measure the room dimensions with a measuring tape or get this information from the floor plan. For example, the room is 17.5 by 12.4 feet.

- 2
Multiply the room length and width to compute the area to be cleaned. In our example, the room area is = 17.5 feet x 12.4 feet = 217 square feet.

- 3
Set your stopwatch to the zero "0:00" time.

- 4
Start your stopwatch when cleaning begins.

- 5
Stop the timer when cleaning is complete; read the elapsed time on the stopwatch. For example, the cleaning time was four hours, 16 minutes and 30 seconds.

- 6
Convert the elapsed time to minutes using the following formula:

Time = Hours x 60 + Minutes + Seconds / 60. In our example, the time is 4 x 60 + 16 + 30 /60 = 256.5 minutes.

- 7
Divide the time by the area size in square feet to calculate the cleaning time per square foot. In our example, 256.5 minutes / 217 square feet = 1.2 minutes per square foot.