# [Project finished dimensions from a before-and-after sample](https://threadcabin.com/explore/79/project-finished-dimensions-from-a-before-and-after-sample)

> A sample changing from 10 × 10 cm to 11 × 9 cm grows 10% in width and shrinks 10% in height. A comparable 50 × 60 cm piece projects to 55 × 54 cm.

- Canonical page: https://threadcabin.com/explore/79/project-finished-dimensions-from-a-before-and-after-sample
- Language: en
- Published: 2026-09-25T17:26:32.9691477+00:00
- Updated: 2026-09-25T17:26:38.2835121+00:00
- Primary image: [Project finished dimensions from a before-and-after sample — measured quantities](https://threadcabin.com/images/learning/u12-plan.png)

A sample changing from 10 × 10 cm to 11 × 9 cm grows 10% in width and shrinks 10% in height. A comparable 50 × 60 cm piece projects to 55 × 54 cm.

## Work through the example

1. Mark the same measured area before treatment. Record both axes without stretching the sample.
2. Use the actual intended washing, drying or blocking method, then let the sample reach its final dry condition before remeasuring.
3. Enter both sets of sample measurements and the unfinished project dimensions. Keep the width ratio and height ratio separate.
4. Compare the projected 55 × 54 cm with the required finished size. If it is unsuitable, change the plan and sample again rather than forcing the final piece to size.
5. Save the treatment details, dimensions and observed fabric changes with the project. Measure the finished piece to check the estimate.

## Check before committing

Small-sample ratios do not guarantee garment behavior under its own weight. Mixed structures and different fibers may require several separate samples.

## 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.

- [Woolmark: how to wash and dry a wool sweater](https://www.woolmark.com/care/how-to-wash-wool-sweater/)
- [Woolmark: machine-washable wool processing and care](https://www.woolmark.com/industry/product-development/processing-innovations/machine-washable-wool/)

[Report a correction](/corrections).

[Browse editable craft templates](/crafts)

## Sources and provenance

- [Block knitting and crochet without guessing at fiber care](https://threadcabin.com/explore/21/block-knitting-and-crochet-without-guessing-at-fiber-care)
- [Blocking change projection](https://threadcabin.com/tools/blocking-change-projection)

## [Blocking change projection](https://threadcabin.com/tools/blocking-change-projection)

Project finished dimensions from the measured change in your blocked swatch.

Measure the same marked sample before finishing and again when completely dry and rested. Keep width paired with width and height with height.  The result predicts comparable fabric behavior; it is not an instruction to stretch a project to those dimensions.

Width and height use their own measured after-to-before ratios. This is a projection from your swatch, not a safe stretching target.

- Swatch width: 10 cm
- Swatch height: 10 cm
- Swatch width: 11 cm
- Swatch height: 9 cm
- Project width: 50 cm
- Project height: 60 cm