START WITH WHAT YOU HAVE
Stash blanket calculator
Find a blanket length that fits the yarn already in your basket.
How the stash blanket calculator works
The tool uses your sample to estimate how much rectangular fabric your usable yarn can make. First it divides available yarn by one plus your chosen extra allowance. It then scales the swatch area by that body-yarn budget and divides by the width you chose.
Example: 800 g of yarn at a 100 cm width
A 10 × 10 cm sample weighing 5 g represents 20 cm² of fabric per gram. With 800 g available and a 10% extra allowance, the body budget is about 727.3 g. That gives 14,545.5 cm², or about 145.45 cm long at 100 cm wide. The suggested length rounds down to 145.4 cm.
What does the allowance mean?
10% means extra equal to 10% of estimated body use. It does not mean subtracting 10% of the stash. This definition matches the forward yarn calculator, so the two calculations can be checked against each other.
Can I mix different leftover yarns?
Only treat them as one amount when the measured sample reasonably represents all of them. Different thicknesses, fibers and stitch patterns may use different amounts. Make separate plans when they do. This tool does not allocate yarn among colors.
Does it include borders or a stitch count?
No. It estimates a flat body in one representative fabric. Set aside border yarn separately and follow your pattern for stitch repeats, foundation chains, turning chains and shaping. Read the swatch guide before relying on the example.
Method maintained by Loop & Yard. Published 2026-10-30. Examples illustrate the formulas; they are not measurements of a tested finished blanket.