Sugar has 1g of carbs per 1g of sugar. A packet of sugar can have from 2-4g of sugar so the carb count is between 2g and 4g per packet. Supposedly some Europian countries can have up to 10g of sugar per packet.
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The above is total nonsense. 1g of Splenda contains .95 grams of dextrose and maltodextrin, both with a glycemic index of 105 (gets into your blood as glucose faster than table sugar with a glycemic index of 100). So, if you count maltodextrin as a sugar (really a sugar polymer), it's 95% sugar and 5% sucralose.
A small packet of sugar usually has about 250g of sugar. There could be smaller ones in different countries, but the quarter kilogram size is usually considered to be small.