I avoid the math of quilting as much as possible. I have 2 charts on the wall in the sewing room: one for how many strips, squares, triangles of different sizes, etc. I can get out of a yard of fabric; and one with bed sizes, quilt sizes with or without pillow or drop coverages. Otherwise, I keep my fingers crossed and hope the pattern measurements are correct. I love it when a pattern tells how much to cut for various sizes, and provide both unit and block sizes. But darn, sometimes I have to do the math and that can take me a day or two.

I print everything I can and file in plastic wallets in a ring binder folder...

Since I do charity quilts for kids and most of the fabrics have been donated, I have to look at how much fabric I have and how to stretch it the best way to get a lap size quilt done. I rely a lot on math to figure out how many cut pieces I can get out of a strip. ALWAYS challenging. I like the post about the chart on the D9P.

I love math and always trust my own calculations over someone else's. No charts for me. I'd have to do the math anyway just to verify the accuracy so why bother? :o

I like to use charts... I have a nice size cork board above my desk that I hang my charts on. Print them out place them in page protectors then they go on a snap ring. When I need something they are there waiting for me. I never try to remember things anymore as the brain doesn't always work.

I always do the math myself.

I've never used charts or pre-set formulas.

I put the charts in a file on my computer so I have them for later use. I find I can retreive it better this way than on paper. I can also e-mail them to friends who have questions.

Personally though, I usually just figure it out myself.

I feel this way...but I've forgotten an embarrassing amount of math & geometry that I KNOW I used to know. And I'm not senior enough to blame age! Use it or lose it is no joke! Thank goodness for Google and the kind folks here that can re-teach me things. :)