Tired of undoing rolls of vinyl and fabric to measure how many yards are left? Here’s a quicker and easier way to do it.
This free online calculator by Handy Math will tell you exactly how many yards are left on a roll. All you need to do is input the following figures:
- The outside diameter of the roll
- The diameter of the center hole
- The thickness of the fabric
I recently tested the calculator for accuracy on a brand new 11-yard roll of vinyl. I used digital calipers to get the three figures needed.
On the first try, it calculated that the roll had a little over 11 yards of vinyl. I tested the calculator a few more times on various rolls in my auto upholstery shop and found that it was always within a half yard of the correct measurement.
I got the best results when I entered the figures in millimeters.
The calculator never rendered the exact measurement, but that’s understandable. After all, the rolls and the inner holes aren’t always perfect circles. Also, I was using a cheap pair of Harbor Fright calipers as opposed to high-quality ones.
Still, I was impressed. This handy calculator is accurate enough to help out around the shop — especially when double-checking a supplier’s shipment or making sure I have enough material to finish a job.
Best of all, the calculator is available in two handy smartphone formats that you can keep open on your phone’s browser. Click here to try it out.
Harold RICHARDSON says
Chiedza Imbayago says
As a stores lady, the handy math calculator came in handy in keeping track of the PVC foil I have left in stock. Happiest day ever when i came across it.