QST计算器 🔷
计算四分方三角形（QST）拼块的裁剪尺寸。输入成品尺寸和块数，获取精确的裁剪正方形大小。
How to Use the QST Calculator
Enter the finished size of your QST unit (the finished square after all seaming) and how many units your pattern needs. The calculator returns the cut square size and the number of squares to cut.
To cut: mark and cut each square to the size shown, then cut it diagonally in both directions (X cut) to yield 4 triangles. Pair contrasting triangles and sew to form hourglass/QST units. One square = 2 finished QST units.
QST triangles are cut on the bias and stretch easily. Starch the fabric lightly before cutting, press seams carefully, and square up each unit with a specialty ruler for best accuracy.
常见问题
什么是四分方三角形（QST）？
QST通过将正方形沿两个方向对角裁剪（X形裁剪）得到4个三角形。两个QST三角形拼合成沙漏单元，常用于俄亥俄之星、风车等经典拼块中。
QST裁剪尺寸的计算公式是什么？
QST裁剪正方形等于成品尺寸加3.2厘米。15厘米成品单元裁剪尺寸为18.4厘米，一块正方形可裁出4个三角形等于2个QST单元。
HST和QST有什么区别？
HST沿一个对角线裁剪（2个三角形，每单元1条缝）；QST沿两个对角线裁剪——X形裁剪（4个三角形，每单元需来自不同正方形的2个三角形）。