Question: How Do I Calculate the Capacity of a Washer Tub?
If you have lost your washing machine manual (you can find it here) and you need to know the capacity of your washer tub, it is simple to calculate. This is helpful if you wish to replace an older machine with one with the same size washing capacity.
NOTE: Thanks to the advice of two young men, the formula for calculating tub capacity has been corrected. Thanks, guys. I should have paid more attention in class!
Here is the proper equation; assuming all measurements are in feet.
Volume (cu. ft.) = pi times r times r times D
pi = ~3.14
r = radius (feet); remember r = diameter divided by 2
D = depth (feet); in classic geometrical terms the height of the cylinder
Note: The units result in (cu. ft.). ft times ft times ft = cubic feet.
Here are the proper steps:
- 1. Make all measurements in feet.
- 2. Measure the radius of the tub; from the center of tub to the outside wall of the tub. Alternatively, measure the diameter and divide by 2. This is the radius.
- 3. Multiply the radius by the radius; note this is not the same as multiplying the radius by two. This is equivalent to the radius squared.
- 4. Multiply the radius squared from step 3 above by pi (3.14).
- 5. Multiply the value from step 4 by the depth of the tub to find the cubic feet capacity of the washer.
Today's washers are sold with the capacity listed in cubic feet. A regular capacity machine is between 3.1 and 4.0 cubic feet and will hold 12 to 16 pounds of laundry. A large capacity machine is between 4.2 and 4.5 cubic feet and will hold up to 20 pounds of laundry.
Specific questions? Just ask here.