# [How much yarn is needed when one yarn is held double?](https://threadcabin.com/explore/64/how-much-yarn-is-needed-when-one-yarn-is-held-double)

> For 400 m of working length held double, both strands travel the full distance. With 10% reserve, the requirement is 880 m of the single yarn.

- Canonical page: https://threadcabin.com/explore/64/how-much-yarn-is-needed-when-one-yarn-is-held-double
- Language: en
- Published: 2026-09-25T17:26:32.8734782+00:00
- Updated: 2026-09-25T17:26:38.2069826+00:00
- Primary image: [How much yarn is needed when one yarn is held double? — measured quantities](https://threadcabin.com/images/learning/s34-plan.png)

For 400 m of working length held double, both strands travel the full distance. With 10% reserve, the requirement is 880 m of the single yarn.

## Work through the example

1. Set yarn A to two strands and yarn B to zero. Do not halve the label length and then multiply the strand count again.
2. At 100 m per 50 g ball, 880 m needs nine balls, totaling 900 m and 450 g. Rewinding two ends from one ball changes handling, not total length.
3. Make a new sample with both strands and finish it. Record the resulting stitch density before choosing a project width.

## Check before committing

Holding two strands together does not guarantee a particular yarn category, needle size, gauge or fabric behavior.

## Method and sources

These are original planning examples using the linked tools’ methods. Replace measured inputs with your own samples; a calculator cannot validate the construction. Keep the resulting measurements, choices and remaining checks with the project.

- [CottonWorks: Yarn Spinning, Twist and Ply](https://cottonworks.com/learning-hub/yarn-manufacturing/yarn-spinning/)
- [CottonWorks: Textile Yarns](https://www.cottonworks.com/wp-content/uploads/2017/11/Textile_Yarns.pdf)

[Report a correction](/corrections).

[Browse editable craft templates](/crafts)

## Sources and provenance

- [Yarn twist and ply: structure before stitch](https://threadcabin.com/explore/7/yarn-twist-and-ply-structure-before-stitch)
- [Held-together yarn planner](https://threadcabin.com/tools/held-together-yarn-planner)

## [Held-together yarn planner](https://threadcabin.com/tools/held-together-yarn-planner)

Plan label-based quantities for one or two yarns held together. Enter the working length needed by each strand, not an already combined total.

Enter the working length needed by one strand, not the combined length of every strand. Select how many strands of A and B run throughout.  Each strand consumes the full working length; B can be zero. This estimates separate packages, not the combined yarn weight category or gauge.

Each working strand needs the entered length plus allowance. For each yarn, multiply that length by its strand count, divide by label length, and round up to whole balls. Total purchased mass is the sum of each ball count × label mass. It assumes all strands run together throughout; estimate separate sections separately.

- Required length per working strand: 400 m
- Extra allowance: 10 %
- Length per ball: 100 m
- Weight per ball: 50 g
- Strands held together: 2
- Length per ball: 200 m
- Weight per ball: 25 g
- Strands held together: 0