Scarf Yarn Estimator
How much yarn your scarf needs: stitches, rows and skeins from your own swatch, with fringe and a spare.
Scarf yarn estimator by Envelo ScarfSum: the stitches to cast on, the rows to knit and how many skeins to buy – from your own swatch, with the fringe and a little spare.
Buy too little yarn and the last skein is from another dye lot; buy too much and it sits in the stash. ScarfSum works it out from a small swatch you knit and weigh, so it fits your yarn, your needles and your stitch.
Try it here
A live demo with a made-up example. Nothing you type here is saved or sent anywhere.
What it does
What you can do
- Enter the scarf size you want, in cm or inches, and your gauge – stitches and rows over 10 cm (4 in), fractions too
- Enter your swatch size and weight and the grams and length of a skein from the yarn label
- Add a fringe: fringes at each end, strands in each, their length
- Get the stitches to cast on, the rows to knit, the yarn in grams and metres or yards, and the skeins to buy with your spare
- See how many strands to cut for the fringe and what is left over
- A pattern card with all of it: download as SVG or print on A4 or US Letter
- Backup and restore
Example inside
A made-up garter-stitch scarf, 20 × 160 cm, in worsted wool at 18 stitches and 24 rows over 10 cm, with 10 fringes of 3 strands at each end. The scarf takes 144.4 g and the fringe 8.3 g; with 10 % spare that is 4 skeins of 50 g, about 32 g left over. Cast on 36, knit 384 rows.
How it works
- Download the ZIP and START-HERE.pdf from Etsy after checkout.
- Unzip and open Envelo-ScarfSum.html in your web browser. Look at the filled example, then press My numbers.
- Enter your scarf, your swatch and your yarn. Everything updates as you type and saves in your browser.
What you receive
- START-HERE.pdf (0.12 MB)
- Envelo-ScarfSum-v1.0.zip (1.57 MB)
Inside the ZIP:
- Envelo-ScarfSum.html: the app, opens in your browser by double click and works offline, 11 languages, cm or inches
- examples/: the filled example as a backup file and its pattern card as SVG
- START-HERE/: the guide in 11 languages
- LICENSES.txt and WHAT_YOU_GET.txt
Good to know
- This is a digital download. Nothing is shipped.
- No subscription and no account. The app runs on your device and uploads nothing.
- ScarfSum works with the numbers you enter. Yarn and stitches differ – knit and weigh a swatch first, and keep the spare.
- Your numbers do not sync between devices; move them with the backup file.
- For your own use. Please don't resell or share the files.
- The app, its logo, the texts and the translations were made as code with the help of an AI coding assistant. No AI image generators were used.
A closer look
Buy it on Etsy and download the files straight away.