Thead length

[TomG]

I haven't sewn by hand in forever. I need to resew some leather armchairs but can't find my reference on how long to cut my thread for a strap.  3X the length, 4X?  

Thanks

[cowboycolonel]

Depends on the thickness of the leather as well as the length. For saddle skirts, which come in at about 13-15 oz, I do twice the length, PLUS and additional 1/3 the length per side, when doing double needle stitching.  In other words, 2 and 2/3 times the length to be sewed.  It doesn't hurt to be come adept at splicing either.  That way you end up wasting a lot less thread -- and I never throw away the "ends", saving them for tacking of sewing small items like keepers.  That flax is expensive, so no need to waste it.

[Instinctive]

There's an APP for that. At least for Android.

Canadian Society Of Creative Leather Craft (CSCL) have developed a Thread Length Calculator.

Link in the play store is https://is.gd/l8OX4s

I assume there is one for Apple as well.

[TomG]

Thanks.  I got it.  And it was pretty close to the figures cowboycolonel gave.
Now to the tedious job of sewing all this stuff up. Hope the arthritis holds out <g>