Flying Geese Calculator

Flying geese are the triangle-in-a-rectangle unit behind classic quilt borders and sawtooth patterns, and the two standard ways to build them cut fabric to noticeably different sizes for the exact same finished result. The traditional method sews one large rectangle plus two small squares (their corners trimmed off after stitching) into a single goose, so this calculator adds a standard 1/2" — a 1/4" seam allowance on each side — to your finished width and height for the rectangle, and the same 1/2" to the finished height for each small square. The no-waste, or "four-at-once," method instead cuts one oversized square and four small squares, sews and trims them in a specific sequence, and yields four identical geese from a single cutting operation with no fabric discarded as trimmed corners.

That method needs an extra margin because the large square gets divided diagonally twice: 1-1/4" added to the finished width for the large square, and 7/8" added to the finished height for each small square, both standard, well-established allowances in quilting references. Because these two methods start from different-sized fabric pieces to reach the same finished unit, the choice is really about workflow and waste rather than the geometry of the finished block — traditional gives you full control over precisely which fabrics pair together goose by goose, while no-waste trades that flexibility for speed and zero fabric loss to trimmed triangle corners. This calculator assumes a standard quarter-inch seam allowance throughout, so if your project uses a different seam width, the fabric sizes calculated here will need adjusting to match.