How do I measure a rolled up carpet?

Question

How do I measure a rolled up carpet without un-rolling? I used to work in a carpet shop and have seen some of the workers do it. I think that they used some mathematical formulae.

Thank you

Answer 1

I'm not sure if there is a 100% accurate way of doing this, while you can get a rough estimate by measuring the circumference of the roll and multiplying this by the times the roll covers 360 degrees, this does not take into account that each roll of the carpet gets smaller, and the added difference due to the height of the nap of the carpet.
Add to the fact everytime I've had carpet installed there is lots left over.

Answer 2

How To Measure For Carpet

Answer 3

measure the diameter of the entire roll, add that to the diameter of the center roll. next count the number of rings on the roll and multiply it with the previous total. finally multiply that answer by .1744 and it will give you the total square yards. this formula works only for 12' wide carpet. if you have different size roll such as 6' and 15' then divide by 2 or multiply by 1.25 respectfully

Answer 4

Unroll it, then measure. Can't find the exact measurements when it's all rolled up, but you probably could try some mathematical calculations (i.e., radius of circle, number of layers, etc.) if you were really bored / desperate.

Answer 5

I used to use something similar to Leo_l's.

Measure halfway from the inside to outside on the left-hand side to half-way on the right-hand side. This gives you the mean diameter of all of the rings. Multiply by Pi (3.14) to achieve the circumference.

Then count the number of rings, and multiply that by the mean circumference.

This has given a very good approximation of various rolled product.

Answer 6

The formula I use is {(pole circ. + outside circ.)/2} x number of rings. To get this, you need a flexible tape rule. I use a cloth one, used for sewing. Wrap it around the pole to get the inside circumference. Wrap it around the the outside to get that distance. The circumference is the distance around. When you add the shortest and the longest circumferences and divide that total by 2, you get a good figure for the average distance around. Multiply that number by the number of rings, to get total carpet length. The only issue is that the roll has to be tight.

Answer 7

I doubt that, considering each layer in the Roll is a different length as it grows over a larger roll each time.

Answer 8

Hey Leo L That's some good info (-:

Answer 9

best to unroll it

Answer 10

you have got to unroll it first ,,sorry