Roving Weight Calculator

Ounces of roving needed for target yardage.

Target yarn yardage

Target WPI

Number of plies

Waste allowance (%)

Roving price ($/oz)

Tab to move between fields

Roving needed (oz)

0.72

Roving needed (g)20

Finished yarn weight (oz)0.65

Yards per pound9,800

4 oz braids needed1

Estimated cost ($)$1.44

Cost per yard ($)$0.00

Finished Weight Lb0.04

Total Roving Lb0.04

How to Use This Calculator

Enter the total yards of finished yarn you need for your project.
Enter the target WPI of the finished yarn.
Set the number of plies.
Enter a waste allowance percentage to cover sampling, leader yarn, and spinning waste (5–15% is typical).
Enter the roving price per ounce to see the estimated total cost.
Read the total roving needed in ounces and grams, plus the number of standard 4 oz braids to purchase.

How the result changes with Target WPI

Target yarn yardage: Total yards of finished yarn needed for your project.
Target WPI: Wraps per inch of your target finished yarn.
Number of plies: Number of singles plied together.
Waste allowance (%): Extra fiber for sampling, leader yarn, and spinning waste (typically 5-15%).
Roving price ($/oz): Cost per ounce of roving or top for cost estimation.

Roving needed (oz): Total ounces of roving/top to purchase including waste allowance.
Roving needed (g): Total grams of roving/top needed.
Finished yarn weight (oz): Weight of the finished yarn without waste allowance.
Yards per pound: McMorran's estimate of yards per pound for your yarn.
4 oz braids needed: Number of standard 4 oz braids/bumps to purchase.
Estimated cost ($): Total cost of roving at your specified price.
Cost per yard ($): Cost per yard of finished yarn.

Identify Input Parameters
4 parameters
Target yarn yardage = 400, Target WPI = 14, Number of plies = 2, Waste allowance (%) = 10 = 5 input(s) provided
Calculate Roving needed
Roving needed = finishedWeightOz * (1 + wastePct / 100)
0.72 = 0.72
Calculate Roving needed
Roving needed = totalRovingOz * 28.35
20 = 20
Calculate Finished yarn weight
Finished yarn weight = targetYards / max(0.01, yardsPerOz)
0.65 = 0.65