For this questions I'm assuming you mean ground allspice. There are 6 teaspoons in an ounce of allspice. 1 ounce = 2 Tablespoons 1 Tablespoon = 3 teaspoons

well there are 6 teaspoons in an ounce. half of an ounce would be 3 teaspoons .25 ounces is 1/4 of an ounce (which is half of half an ounce) that would be 1 1/2 teaspoons (that's half of 3)

1 US ounce is equal to 29.5735 ml 1 Imperial ounce is equal to 28.4131 ml a teaspoon is equal 5ml so: there are 5.6826 teaspoons in one imperial ounce and 5.9147 teaspoons in one US ounce I think 5.5 or 6 teaspoons is good approximation