Fiber Blend Calculator
Calculate blend ratios by weight for mixed fiber yarns and estimate blended material cost.
About this calculator
Blending fibers by weight is the standard way yarn manufacturers describe a mix — a label reading 60% cotton, 30% wool, 10% nylon refers to the proportion of each fiber's mass in the total, not its volume or how prominent it appears visually in the finished yarn. This calculator takes up to three fiber weights and divides each by their combined total to produce that percentage breakdown. Blend Cost per kg is a weighted average, not a simple average of the three per-kilogram prices — because weights are entered in grams while cost is quoted per kilogram, the calculator converts each fiber's contribution to cost before summing, then divides by the total blend weight to arrive at one effective cost figure for the finished mix.
That weighting matters: a small amount of an expensive fiber pulls the blend cost up less than an equal-cost fiber that makes up a larger share of the total weight. Leaving Fiber 3 Weight at zero simply models a two-fiber blend, since a zero-weight component contributes nothing to either the percentage breakdown or the cost calculation.
Inputs
Results
Fiber 1 Ratio
60%
How to Use This Calculator
- Enter Fiber 1 Weight, Fiber 2 Weight, and Fiber 3 Weight.
- Set Fiber 1 Cost, Fiber 2 Cost, and Fiber 3 Cost.
- Review the Fiber 1 Ratio (%) result.
- Use Fiber 2 Ratio (%) and Fiber 3 Ratio (%) to inform your decision.
- Use the chart to visualize the results and explore different scenarios by adjusting inputs.
How the result changes with Fiber 1 Weight
| Fiber 1 Weight | Fiber 1 Ratio |
|---|---|
| 300 | 42.9% |
| 450 | 52.9% |
| 900 | 69.2% |
| 1,500 | 78.9% |
What each input means
- Fiber 1 Weight
- Weight of the first fiber component
- Fiber 2 Weight
- Weight of the second fiber component
- Fiber 3 Weight
- Weight of the third fiber component (0 if not used)
- Fiber 1 Cost
- Cost per kg of the first fiber
- Fiber 2 Cost
- Cost per kg of the second fiber
- Fiber 3 Cost
- Cost per kg of the third fiber
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersFiber 1 Weight = 600, Fiber 2 Weight = 300, Fiber 3 Weight = 100, Fiber 1 Cost = 8 = 6 input(s) provided
- Calculate Fiber 1 RatioFiber 1 Ratio60 = 60
- Calculate Fiber 2 RatioFiber 2 Ratio30 = 30
- Calculate Fiber 3 RatioFiber 3 Ratio10 = 10
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why do fiber weights get entered in grams while cost is quoted per kilogram?
Grams are the practical unit for weighing out a batch of fiber on a typical scale, while cost per kilogram is how most fiber suppliers quote bulk pricing — the calculator converts between the two internally so you can enter each figure in the unit that's actually convenient to measure or look up.
What happens if I leave Fiber 3 Weight at zero?
The calculation simply treats it as a two-fiber blend — Fiber 3's percentage comes out to zero and it contributes nothing to the total cost, since a zero weight has no mass to factor into either calculation. This makes the calculator equally usable for a simple two-fiber blend as for a three-fiber one.
Does Blend Cost per kg equal a simple average of the three fiber prices?
No — it's a weighted average based on how much of each fiber's weight actually goes into the blend, not a flat average of the three per-kilogram prices. A blend that's 90% of a cheap fiber and 10% of an expensive one will land much closer to the cheap fiber's price than a straight average of the two prices would suggest.
Why might my blend percentages not add up to a perfectly round number?
Percentages are calculated directly from whatever weights you enter and rounded to one decimal place for display, so unless the weights you chose happen to divide into clean round fractions of the total, the displayed percentages will reflect that precise ratio rather than a tidy number. This is expected behavior, not a rounding error in the calculation itself.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Yarn Denier/Tex Converter
Convert between denier, tex, Nm, and Ne yarn numbering systems for fiber and yarn specification.
Textile ScienceFabric Weight Converter
Convert fabric weight between GSM, oz/yd², and oz/linear yard for accurate textile comparison and specification.
SpinningFiber Blend Ratio Calculator
Blending percentages for target yarn properties.
SpinningFiber-to-Yarn Yield Calculator
Finished yarn yardage from raw fiber weight.
FertilizerFertilizer Blend Calculator
Custom blend proportions for target N-P-K analysis.
More in Crafts, Hobbies & Games.