Fiber Blend Calculator
Calculate fiber blend percentages and weights for spinning and yarn production. Mix ratios for wool, silk, cotton, and synthetic blends.
Specialist tool for Weaving1 documented formula2 recommended next stepsPrivate in your browser
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Inputs that matter
Fiber A Weight, Fiber B Weight, Fiber A Name, Fiber B Name
Output to expect
Fiber Blend Calculator
How it works
1 documented formula across 1 calculation mode
- Confirm that every value uses the unit and time basis shown before comparing scenarios.
- Change one input at a time to see which assumption materially changes the result.
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Reference & details
How it works
Updated July 2026
How it works
Updated July 2026Component Weight from Percentage
Multiply total batch weight by each fiber's target percentage. A 100g batch of 70/30 wool/silk needs 70g wool and 30g silk.
Component weight = Total weight × (Percentage ÷ 100)Percentage from Weights
Weigh each fiber after blending to verify ratios. Adjust by adding more of deficient component.
Percentage = (Component weight ÷ Total weight) × 100Volume vs Weight Blending
Different fibers have different densities. A cup of silk weighs less than a cup of wool — weight ratios ensure consistent blend percentages.
Always blend by weight, not volumeUpdated: July 2026
Example Scenarios
500g total blend: 350g merino top + 150g silk sliver. Card together on drum carder for luxury sock yarn.
60% wool + 25% mohair + 15% nylon for 200g: 120g + 50g + 30g. Verify percentages before carding.
Have 80g wool and need 70/30 blend — total batch = 80 ÷ 0.7 = 114g, add 34g silk to complete ratio.
FAQ
Always by weight. Volume measurements are inaccurate due to different fiber densities, crimp, and preparation (top vs roving vs batts).
Wool/nylon socks: 80/20 or 75/25. Wool/silk luxury: 70/30 or 80/20. Cotton/linen summer: 50/50 or 60/40. Tweed neps: 90/10 main/accent.
Use a digital scale accurate to 0.1g. Calculate each component weight before mixing. For blends under 50g, precision matters more for ratio accuracy.
Yes. Enter label percentages and total skein weight to determine fiber content in grams. Useful for recycling or reproducing commercial blends.
Drum carder: 2–3 passes minimum. Hand carding: 4–6 passes. Blending board: depends on stripe fineness. Always test-spin a sample before committing full batch.
About Fiber Blend Calculator
Creating consistent fiber blends requires accurate weight ratios. Enter target blend percentages and total batch weight to calculate grams or ounces of each fiber component, or determine blend percentages from component weights.