Sailcloth weight is a common source of confusion for sailors. There are five different methods your Sailmaker or Covermaker could use to describe the weight of a cloth. When you compare quotes it is important that you understand what weight of cloth is being suggested. 1. Sailmaker Ounces (smoz): Weight in ounces of a piece of cloth 36" x 28.5". The traditional measure of sailcloth weight. 2. Grams/ Square Meter (gsm) 3. Ounces/Square Yard : Used for marine fabrics such as Sunbrella® or Dickson® Type the weight of cloth you have been quoted into the corresponding box to convert to another unit: Please Select Smoz Oz/Sq Yd GSM = Please Select Smoz Oz/Sq Yd GSM 4. Generic Spinnaker Weight : Traditionally, Spinnaker fabric was given a weight measured before it was finished. These have been adopted into everyday sailing jargon to describe a generic band of cloth. So, when you call your bowman to hoist the half ounce, the cloth actually weighs 0.82 to 0.9 smoz or 35 to 38 gsm. The chart below shows how these generic weights relate to finished weight. 5. Specific Cloth : You may have been quoted a specific cloth such as Bainbridge Ocean-750. This is the style name and not an accurate measure of weight. In all cases, if you are not clear on what cloth you have been quoted, contact your Sailmaker.