1 Teaspoon to Tablespoon
1 tsp = 1/3 tbsp
= 4.9 ml
One teaspoon equals exactly 1/3 tablespoon, 4.93 ml (NIST US figure) or 5 ml (BSI UK and Standards Australia metric figure). This is the fundamental smallest standard kitchen measurement. The teaspoon is identical across US, UK, and Australian systems (only the tablespoon size differs between regions: US/UK 15 ml, AU 20 ml). 1 teaspoon is the standard amount of vanilla extract in many small-batch cookies, the salt in a single bread loaf, or the baking powder per cup of flour in many quick breads. Practically, fill a 1 teaspoon measuring spoon and level it with the flat edge of a knife.
0.3333
Adjacent Teaspoon Values
Common Questions
How many tablespoons is 1 teaspoon?
One teaspoon equals 1/3 tablespoon (0.333 tbsp). The math: tsp / 3 = tbsp.
What is 1 teaspoon in ml?
One US teaspoon is 4.93 ml (NIST figure, derived from 1 US fl oz = 29.5735 ml). One UK teaspoon and one Australian teaspoon are both 5 ml exact (BSI / Standards Australia AS 1291). For most purposes 1 tsp = 5 ml is the practical figure.
Is the teaspoon the same in the US, UK, and Australia?
Effectively yes. The US teaspoon is 4.93 ml (per NIST); the UK and Australian teaspoon is 5 ml exact (per BSI and Standards Australia AS 1291). The difference (0.07 ml) is well below the precision of any kitchen measuring spoon. The teaspoon is the unit that does not differ between regional cooking systems; only the tablespoon does (US/UK 15 ml vs AU 20 ml).
How do I measure 1 teaspoon accurately?
Use a calibrated 1 teaspoon measuring spoon. For dry ingredients, fill the spoon and level the top with the flat edge of a knife. For liquids, fill to the rim without overflow. Do not use household cutlery teaspoons; they vary 2.5 to 7 ml and are not calibrated.