Coaster set: Yarn & Project Calculator

Plan six objects rather than one large object

This set contains six plain square coasters, each ten centimeters on each side after washing. Their combined area is six hundred square centimeters. To enter that sum into a rectangular calculator, use width ten and equivalent combined height sixty. The result is a quantity budget for six separate squares; it is not a sixty-centimeter runner. Label the saved project accordingly so its accounting dimensions are not mistaken for construction instructions.

Measure a finished coaster fabric

The example sample consumes sixteen meters per hundred square centimeters. In practice, use the intended yarn and hook and include the complete stitch repeat in the test piece. Wash, dry and flatten it using the intended care method. Measure relaxed dimensions without pinning the coaster larger than its normal use size. Record whether the consumption measurement includes start and end tails, because six separate pieces require more tails than a single continuous rectangle.

Check the set-level arithmetic

Enter sample area one hundred, sample yarn sixteen, ball length one hundred twenty-five and allowance fifteen. Six sample equivalents use ninety-six meters before allowance. Fifteen percent contributes 14.4 meters, so the set estimate is 110.4 meters. Divide by one hundred twenty-five to obtain 0.8832 balls. One ball supplies one hundred twenty-five meters and leaves 14.6 meters above the allowance-inclusive estimate. The result assumes all six coasters can use that same yarn supply.

Why rounding each coaster changes the answer

Each individual coaster has an allowance-inclusive estimate of 18.4 meters. If every coaster were treated as a separate shopping trip, rounding each one up to a whole ball would misleadingly suggest six balls. When the same color and yarn can be shared, add lengths first and round once. If all six must be different colors and no suitable leftovers are available, separate color purchases may really require six sources of yarn despite the small combined length.

Keep borders and repeated finishing explicit

A one-centimeter border added outside each ten-centimeter square changes its outside dimensions to twelve by twelve centimeters. Each border adds forty-four square centimeters, or 264 square centimeters across the set. Measure that border stitch separately if its density differs. Estimate any hanging loop by the actual measured loop construction, not by adding an invented percentage to the square's area. Repeated tails and joins can dominate small projects, so write down how the chosen fifteen-percent allowance is being used.

From budget to finished set

Use the Coaster Set Generator only for supported shapes and verify gauge before selecting a stitch count. Check every coaster against the first washed reference instead of assuming equal row counts always give equal dimensions. Does this example support a six-piece round set without changing inputs? No; the area must be recalculated for circles. Can colors use unequal amounts? Yes; keep independent color budgets and ball sizes. Save the yarn label, measured reference and JSON together so replacements can match the original specification.

Reproduce and retain the estimate

Download this exact calculator record and import it into the Yarn & Project Calculator. The saved inputs are teaching measurements, not measurements of a physically completed sample. Replace the sample consumption with your own washed fabric record before purchasing yarn.

110.4 m estimated from measured swatch: 600 / 100 × 16 × 1.15. Buy 1 ball of 125 m.