From stitches to inches, centimetres and a useful project note.

First, find the stitched rectangle

Read the stitch width and stitch height from the pattern. Divide each by the Aida count. For a 100 × 150-stitch pattern on 14-count Aida, the width is 100 ÷ 14 = 7.142857… inches and the height is 150 ÷ 14 = 10.714285… inches.

Keep the repeating decimals while calculating. If you round the stitched size before adding margins or converting units, the small rounding differences can accumulate. Stitch Size keeps full numeric precision internally and rounds only the displayed results.

Then, add the space around it

With 2 inches on every edge, add 4 inches to the width and 4 inches to the height. That gives 11.142857… × 14.714285… inches of fabric. Width and height are kept in the same order as the chart; the tool does not silently rotate the plan.

When your margin is in centimetres, it is converted to inches before being added to the stitched size. For example, 5.08 centimetres is exactly 2 inches, so those two inputs produce the same fabric dimensions. Changing the display unit does not change how many stitches fit in an inch of Aida.

Convert with 2.54 and 25.4

One inch is exactly 2.54 centimetres, or 25.4 millimetres. Multiply the inch measurement by 2.54 for centimetres and by 25.4 for millimetres. In our example, the fabric is about 28.3029 × 37.3743 centimetres, or 283.0286 × 373.7429 millimetres.

The exact conversion relationship is defined in the SI units guidance from the US National Institute of Standards and Technology. Do not substitute 2.5 centimetres for an inch when you need an accurate cut plan. That shortcut becomes noticeable over a larger piece.

Make the result useful away from your screen

A useful project note records the stitch dimensions, Aida count, margin per edge and calculated fabric size. Keep all four together. A fabric measurement without a count or margin is difficult to check later, especially if you have several projects in progress.

The planner’s print button opens the browser print dialog with those details and a proportion preview. The preview explains the relationship between design and margin; it is not a life-size cutting template. Printers and browser scaling settings vary, so measure cloth with a ruler rather than measuring the illustration. You can also save one plan in your current browser when you choose the save button.

• Chart: 100 stitches wide × 150 stitches high.
• Fabric: 14-count Aida, one stitch per square.
• Blank margin: 2 inches on every edge.
• Calculated fabric: 11.1429 × 14.7143 inches.
• Practical next step: select a piece at least that large, with any extra reserve you choose.