What do thread weight numbers mean?

Thread weight is measured in wt (weight): 40wt is standard embroidery, 30wt is heavier, 60wt is finer. Higher numbers mean thinner thread. Weight affects coverage, stitch density, and the look of the finished design.

How do I convert between metres and yards?

1 metre = 1.094 yards. 1 yard = 0.914 metres. Many US patterns and thread brands use yards; UK and European brands use metres. This calculator converts between them automatically.

What spool sizes are available?

Mini spools: 200-500m. Standard spools: 1,000m. King spools: 5,000m. Cones: 5,000-10,000m. For occasional use, standard spools are fine. For production work, king spools or cones are more economical.

Does thread weight affect the spool length?

Yes. Heavier threads (30wt, 12wt) take up more space on the same physical spool, so it holds fewer metres than a finer 40wt or 60wt thread. The exact put-up varies by brand — always check the metres or yards printed on the reel rather than assuming, as Madeira, Isacord and Aurifil all wind differently. This calculator converts the length you actually have; it does not estimate weight-to-weight equivalence.

SewCalcs

Thread Length Converter & Spool Estimator

Convert thread length between metres, yards and feet, and work out how many spools you need.

Thread Length

Total thread the project needs, in the unit chosen on the right (stitch length × density, or the figure from your pattern).

UnitThe unit your thread length is given in. UK and European reels use metres; many US patterns and brands use yards.

Spool SizeYour reel or cone size. The result rounds up to whole spools so you never run short mid-project.

How We Calculate This

Thread length is converted between metric and imperial units. Spool estimates are based on the selected spool size.

The conversions

1 metre = 1.094 yards = 3.281 feet

1 yard = 0.914 metres = 3 feet

Spools = ceil(Total length ÷ Spool size)

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities before cutting or purchasing fabric.