Fabric count and stitching over threads
Fabric count describes the repeat density of the cloth. Enter Aida squares per inch or centimetre when stitching over one square. For linen and evenweave, enter fabric threads per unit and choose how many threads each cross spans; for example, 28 threads per inch stitched over two gives 14 cross stitches per inch.
How design and cut sizes are calculated
Stitches per inch equals fabric threads or squares per inch divided by the selected thread span. Finished width and height equal the chart's stitch counts divided by stitches per inch. The cut size adds the finishing allowance twice in each direction, once for each opposite side.
How to interpret the floss estimate
The optional floss estimate starts with the number of filled full crosses, uses two stitch-face diagonals per cross, multiplies by the selected number of strands, and adds your extra-thread allowance. It is a geometric planning estimate, not a guarantee: fractional stitches, backstitch, colour changes, carrying distance, railroading, starting and finishing method, tension, mistakes, and unusable remnants can materially change actual floss use. Estimate each colour separately when colour quantities matter.