White (granulated) sugar has a density of about 0.850 g/mL, so 5.80 teaspoons weigh 1 gram.
Volume measurements like teaspoons capture space, not mass. Sifted or packed ingredients can vary by up to 30%, so a kitchen scale gives the most accurate results for baking.
Next stepFor baking recipes requiring precision, weigh your ingredient directly on a kitchen scale rather than converting from a volume measure.