0.3 Tablespoon to Teaspoon
0.3 tbsp = 0.9 tsp
= 4.4 ml | 0.15 fl oz | 0.0187 cups
Closest practical measure: 1 tsp (a little less)
Australia: 0.3 tbsp = 1.2 tsp (20 ml tablespoon)
0.3 of a tablespoon is 0.9 teaspoon, just under a full teaspoon. A tablespoon holds 3 level teaspoons, so 0.3 of it is 3 × 0.3 = 0.9 tsp (4.4 ml). That is a shade under one level teaspoon (5 ml), so fill a teaspoon not quite to the top; for cooking outside precision baking a level teaspoon is close enough. A recipe scaler prints 0.3 tbsp when it has scaled a larger batch down.
Three-tenths of a tablespoon is 0.9 teaspoon or 4.4 ml. This is just under a full teaspoon (which is 1.0 tsp = 5 ml). For practical home cooking, 0.3 tablespoon is essentially one teaspoon minus a small pinch. It appears in nutrition-tracker recipes where ingredient quantities are reported to one decimal and in batch-scaled professional recipes. To measure it precisely, fill a 1 teaspoon measure and remove a small amount, or fill a 1/4 teaspoon three times then add a touch more. In Australia, 0.3 of a 20 ml tablespoon equals 1.2 metric teaspoons (6 ml).