Measure blocking changes on both axes

Record width and height independently before and after finishing. A sample can grow wider while becoming shorter.

Before you start

Gather the measurements, counts or timing sample needed below. Record their units and whether they describe a sample, the whole project or one purchased package. Use a finished sample when dimensions or material use depend on fabric structure.

Try this example

A 10 × 10 cm sample becoming 11 × 9 cm changes by +10% in width and −10% in height. A comparable 40 × 60 cm piece projects to 44 × 54 cm.

Check your result

Recheck the inputs against the actual sample or label, keep units consistent and round only the final count or purchase. Repeat a sample if a small measuring difference changes the decision.
These arithmetic examples assume the measured structure stays comparable. Shaping, borders, dense textures and color changes require their own allowances or samples.

Sources

Browse editable craft templates

Report a correction.

Blocking change projection

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

Knitting · Crochet

Before you use this tool

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.

Method and limits

Formula and assumptions

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

Worked example

Example: a swatch changing from 10 × 10 cm to 11 × 9 cm projects a 50 × 60 cm piece to about 55 × 54 cm.

Limits and rounding

Results are planning estimates from the values entered. Displayed decimals are rounded for craft use; whole materials and repeats round up where the method says so. Confirm gauge, material behavior, construction, and finished measurements before committing supplies.

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