Free FiberTools newsletter

Swatch Signal

One practical fiber-math note most weeks. Each issue starts with a real project decision, shows the calculation, and links to the free tool that helps you check it yourself.

Join free and get the Survival Kit now

The seven-page fillable and printable kit includes sourced yarn weights, tool conversions, swatch-to-finish math, yarn planning, and a project-rescue record.

After signup succeeds, a download button appears here. Save the PDF to your device; you do not need to wait for an email to download the kit.

Look inside the free Survival Kit

These are pages 5 and 7 from the actual seven-page PDF: a gift preview, not a newsletter issue.

Page 5: Swatch-to-finish calculation. Open the PDF to read the full page. — **Swatch-to-finish calculation.** The worked example compares 4.25 inches after treatment with 4 inches before treatment: about 6.25% growth. The page explains how to use the ratio and why it is an estimate.

Page 7: Fillable project-rescue record. Open the PDF to read the full page. — **Project-rescue record.** Keep yarn and dye-lot details, before-and-after swatch measurements, target size, and your next decision together. Save a fresh copy for each project or print the page.

Open the complete free kit (7-page PDF). No signup is needed to view these pages.

Built to save a project, not fill an inbox

Every issue follows the same useful four-part rhythm.

The swatch

One real measurement

A before-and-after treatment example that shows what changed and why it matters.

The math

One worked decision

A transparent formula for size, gauge, yarn, repeats, or shaping - with assumptions visible.

The rescue

One mistake to prevent

A short checkpoint to run before buying yarn, restarting, cutting, seaming, or finishing.

The vote

One choice for readers

A fixed, privacy-safe vote on the next calculator, experiment, printable, or product problem.

The inbox promise

No affiliate links inside the email; product guidance stays on clearly disclosed website pages.
No copied patterns, private project text, or calculator results in analytics.
No daily content treadmill. We send when there is a calculation or experiment worth keeping.
Every issue includes an unsubscribe link, and the free calculators remain available without an account.

Want to see the methodology first? Read the FiberTools Formula Library.