Seam & Hem Allowance Adviser

Stop guessing your seam and hem sizes. This tool acts as an expert tailor, giving you industry-standard recommendations based on your garment type and fabric weight.

Why Use This Tool?

  • Get instant, professional recommendations for any project.
  • Understand *why* certain sizes are used with the "Pro Tip".
  • Ensure your garments hang and fit correctly with the right allowances.
  • Build your sewing confidence with best-practice advice.

How to Use It

  1. 1. Select the type of garment you are making (e.g., Trousers, Jacket).
  2. 2. Choose your fabric type (e.g., Lightweight, Heavyweight).
  3. 3. Click "Get Advice" to see your recommended seam and hem allowances.
  4. 4. Read the "Pro Tip" to understand the rationale behind the advice.

Frequently Asked Questions

What is the "standard" seam allowance?

In commercial patterns, it is almost always 1.5cm (5/8 inch). However, this is not always the *best* allowance. For lightweight silks, a smaller French seam is better. For thick wools, a 1.5cm-2cm seam is needed to press flat.

What if my fabric isn't listed?

Choose the closest match. The main factor is weight. "Linen" and "quilting cotton" would both be "Medium-weight". "Brocade" or "Denim" would be "Heavyweight".

Does this tool work for Imperial (inches)?

Yes! The tool provides the recommendation in both Centimetres and Inches, so you can use whichever you are comfortable with.