Wazoodle Fabrics Shrinkage Calculator To calculate shrinkage, cut your fabric into a square, record the measurements before washing in the column marked Unwashed. Wash & dry your fabrics using the product's care instructions and record measurements. Repeat the wash & dry until the measurement stays constant (no change),ย This is typically 1 wash for synthetics, 2-3 for natural or regenerated fibers. Record the final length and width in the calculator. Dimensions (in or cm) Unwashed Washed Width (Stretch) Length (Grain) Shrinkage Units Percentage Width loss Length loss Overall loss ย Fabric Weight Converter