0.5 Tablespoon to Teaspoon
0.5 tbsp = 1.5 tsp
= 7.4 ml | 0.25 fl oz | 0.0313 cups
Measure it: 1 tsp + 1/2 tsp
Australia: 0.5 tbsp = 2 tsp (20 ml tablespoon)
0.5 of a tablespoon is 1.5 teaspoons, which is 1 teaspoon plus 1/2 teaspoon. A tablespoon holds 3 level teaspoons, so half of it is 3 × 0.5 = 1.5 tsp (7.4 ml). It is the same amount as 1/2 tablespoon; a recipe scaler just prints the decimal instead of the fraction. Measure it as 1 level teaspoon plus one 1/2 teaspoon rather than trying to half-fill a tablespoon, which is hard to eyeball accurately.
0.5 tablespoon is exactly the same quantity as half a tablespoon: 1.5 teaspoons, 7.4 ml, or 0.25 fluid ounce. The decimal notation typically appears when recipes are scaled programmatically (such as in a nutrition calculator); the fractional notation 1/2 tbsp is more common in handwritten recipes. The most accurate measurement is 1 teaspoon plus 1/2 teaspoon, rather than trying to half-fill a tablespoon measure (eyeballing the midpoint of a tablespoon is unreliable). See also the fractional page 1/2 tablespoon to teaspoons which covers the same value.