# [Plan a rib scarf from a finished sample](https://threadcabin.com/explore/81/plan-a-rib-scarf-from-a-finished-sample)

> For a relaxed rib sample measuring 20 stitches and 30 rows per 10 cm, a 20 × 150 cm scarf starts from 40 stitches and 450 rows. Confirm edge treatment and stretch before choosing the final counts.

- Canonical page: https://threadcabin.com/explore/81/plan-a-rib-scarf-from-a-finished-sample
- Language: en
- Published: 2026-09-25T17:26:32.9825082+00:00
- Updated: 2026-09-25T17:26:38.2940827+00:00
- Craft: Knitting
- Primary image: [Plan a rib scarf from a finished sample — measured quantities](https://threadcabin.com/images/learning/n01-plan.png)

For a relaxed rib sample measuring 20 stitches and 30 rows per 10 cm, a 20 × 150 cm scarf starts from 40 stitches and 450 rows. Confirm edge treatment and stretch before choosing the final counts.

## Work through the example

1. Swatch the exact rib and intended selvedges, then finish it. Record both relaxed width and comfortably stretched width; use the relaxed gauge for the resting dimensions here.
2. Enter the 20 × 150 cm finished target with zero extra ease. The width is already a finished measurement, not a body measurement.
3. Fit the 40-stitch target to the actual repeat and fixed edges. The example uses a four-stitch repeat with no additional edge stitches; a different selvedge changes that setup.
4. Weigh a representative 10 × 10 cm portion. At an example 5 g, the 3,000 cm² scarf projects to 150 g before reserve, or 165 g with 10%.
5. Print chosen counts, sample measurements and material budget. Work a short section, finish-check it, then continue only if width, edge and handle suit the scarf.

## Check before committing

The measurements are a planning example, not row-by-row scarf instructions. Rib contracts; do not substitute stockinette gauge or force a relaxed rib to its stretched width.

## Printable planning record

Inputs and sample measurements recorded; chosen result checked; material/color references recorded; reserve included once; construction and finishing checks completed.

## 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.

- [Craft Yarn Council: Standard Yarn Weight System](https://www.craftyarncouncil.com/standards/yarn-weight-system)
- [Craft Yarn Council: Hooks & Needles](https://craftyarncouncil.com/standards/hooks-and-needles)

[Report a correction](/corrections).

[Browse editable craft templates](/crafts?craft=knitting)

## Sources and provenance

- [Gauge is a fabric measurement, not a needle promise](https://threadcabin.com/explore/2/gauge-is-a-fabric-measurement-not-a-needle-promise)
- [Fit stitch repeats between fixed edges](https://threadcabin.com/explore/68/fit-stitch-repeats-between-fixed-edges)
- [Estimate a rectangular project from a weighed sample](https://threadcabin.com/explore/63/estimate-a-rectangular-project-from-a-weighed-sample)
- [Gauge & size planner](https://threadcabin.com/tools/gauge-size-planner)
- [Stitch-repeat fitting planner](https://threadcabin.com/tools/stitch-repeat-fitting)
- [Swatch-based yarn estimator](https://threadcabin.com/tools/swatch-yarn-estimator)

## [Gauge & size planner](https://threadcabin.com/tools/gauge-size-planner)

Turn a measured swatch into stitch and row counts for your finished size.

Wash and rest a sample in the project’s stitch pattern. Count stitches and rows inside measured central spans, excluding edge distortion.  Positive ease adds room to the target width; negative ease subtracts it. The rounded result is a planning count; fit repeats and construction details before casting on.

Formula: stitches ÷ swatch width × target width after ease; rows ÷ swatch height × target height. Each result follows the selected up, down, or nearest rounding rule and its stitch or row multiple.

- Stitches: 20
- Rows: 30
- Swatch width: 10 cm
- Swatch height: 10 cm
- Target width: 20 cm
- Target height: 150 cm
- Desired ease: 0 %
- Stitch multiple: 1
- Row multiple: 1
- Rounding policy: Nearest valid count

## [Stitch-repeat fitting planner](https://threadcabin.com/tools/stitch-repeat-fitting)

Find the nearest stitch counts that preserve a pattern repeat and edge stitches.

A repeat is the sequence worked again; edge stitches sit outside it. Enter the fixed edge count per side.  Compare the lower and higher valid totals with their predicted widths and deliberately select the fit you want. A valid multiple alone does not establish a comfortable size.

Fixed edge stitches are removed first; the remaining count is rounded down and up to complete repeats. The optional gauge converts both valid counts to finished measurements so their size difference is visible.

- Target stitch count: 40
- Stitches per repeat: 4
- Edge stitches per side: 0
- Target width: 20 cm
- Gauge stitches: 20
- Gauge measurement: 10 cm

## [Swatch-based yarn estimator](https://threadcabin.com/tools/swatch-yarn-estimator)

Estimate yarn for a uniform flat piece from the area and weight of your own washed swatch.

Weigh a dry finished sample without needles, pins or attached extra yarn. Measure only the area represented by that mass.  Target width × height describes a rectangle in the same stitch pattern; sleeves, seams, borders and other structures need separate samples or component estimates.

The target area is divided by the swatch area, then multiplied by swatch weight and allowance. Label length and weight convert that estimate to yarn length and whole balls. A visible ±15% planning band shows sensitivity, not a statistical guarantee. Use only for similarly constructed rectangular fabric with matching stitch pattern, gauge, and density.

- Swatch width: 10 cm
- Swatch height: 10 cm
- Swatch weight: 5 g
- Target width: 20 cm
- Target height: 150 cm
- Weight per ball: 50 g
- Length per ball: 200 m
- Extra allowance: 10 %