I use quite a few French patterns and every time I have to go hunting for fabric counts
For Aïda :
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11 count = 4 points/cm
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14 count = 5,5 points/cm
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16 count = 6 points/cm
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18 count = 7 points/cm
For Linen :
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18 count = 8 fils/cm, 4 points/cm
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25 count = 10 fils/cm, 5 points/cm
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28 count = 11 fils/cm, 5,5 points/cm
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32 count = 12 fils/cm, 6 points/cm
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36 count = 14 fils/cm, 7 points/cm
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40 count = 16 fils/cm, 8 points/cm