Use the free tool below: it runs entirely in your browser, and nothing is uploaded to any server.
Resizing an embroidery design sounds simple, but the numbers catch people out. When you scale a design, its width and height change in proportion, but its stitch count changes with the area, which moves much faster. A design doubled in size does not gain twice the stitches: it gains about four times as many. This free tool shows the new size and the estimated new stitch count at any scale, so you can resize with your eyes open.
Enter the current width and height in centimetres, the current stitch count, and the scale you want as a percentage. One hundred percent keeps the design as it is. Fifty percent halves each side, and 200 percent doubles them. The tool returns the new dimensions and the new stitch count, calculated by squaring the scale factor, because area grows with the square of the side.
That square rule is the key insight. At 150 percent, the design is one and a half times as wide, but its area is 2.25 times as large, so a 10,000 stitch design becomes about 22,500 stitches. At 50 percent it drops to a quarter, about 2,500 stitches. Small changes in size therefore mean large changes in time, thread, and fabric stiffness, and the tool makes that visible before you stitch.
Scaling down has its own dangers. Satin stitches get narrower, and below about 1 millimetre wide they may fail to cover the fabric or may jam the needle. Small text becomes unreadable, and fine details merge into blobs. As a rule, do not scale a design down by more than about 20 percent without re-digitising it. The calculator will happily show you the numbers, but it cannot warn you about a column that has become too thin to stitch.
Scaling up is safer for stitch quality but harder on fabric. A design that was soft at 10 centimetres can become a stiff board at 20 centimetres, and it may need stronger stabilizer or a different fabric altogether. Large scaled designs also take much longer: that 22,500 stitch example needs roughly 38 minutes of machine time at 600 stitches per minute. Plan for that before you promise a deadline.
For professional work, scaling beyond about 20 percent in either direction usually calls for re-digitising rather than a simple resize. A digitiser can adjust densities, underlay, and stitch lengths for the new size, which a plain scale cannot do. The calculator is still useful there, because it gives you the target stitch count to discuss with your digitiser.
Use the tool before you buy a design at the wrong size, too. If a seller offers a design in several sizes, compare the stitch counts the tool predicts against the sizes on offer. A big gap between the prediction and the listed count tells you the larger size was properly re-digitised, which is a good sign, or that the smaller one was simply shrunk, which deserves a test stitch.
All results here are estimates and guidance only. Real stitch counts after scaling vary with fabric, stabilizer, machine, and digitising choices. Use the estimate to plan, then test on scrap fabric at the new size before you stitch the real item.
A practical habit is to keep a scaling log for designs you resize often. Record the original size and count, the scale you applied, the predicted count from this tool, and the real count your software reported after resizing. Over time the gap between prediction and reality tells you how your software handles scaling: some programs preserve density better than others, and some add or drop stitches at edges in ways the simple area rule cannot predict. That log also protects you when a customer asks for the same design at a new size again, because you can quote from experience instead of guessing. Treat the calculator as a planning partner, not an oracle, and let your own records sharpen it.
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