Convert Tablespoon (UK) (tbsp (UK)) to Teaspoon (UK) (tsp (UK)) instantly.
About these units
Tablespoon (UK) (tbsp (UK))
The UK tablespoon traditionally equals 15 mL, though older definitions ranged from 17.7 to 25 mL depending on period and context. In modern British cooking, the tablespoon is standardized at 15 mL, aligning it with the metric tablespoon used in many countries. This measure remains essential in culinary arts for oils, spices, flavorings, and liquid ingredients, demonstrating how some units survive because of convenience and cultural familiarity, even in highly metricized societies.
Teaspoon (UK) (tsp (UK))
The UK teaspoon is defined as 5 milliliters, a value adopted in modern culinary and medical standards. Historically, however, its size varied considerably, often ranging from 4 to 6 mL depending on household spoons, region, or era. The modern 5 mL standardization brought consistency to recipes, pharmaceutical dosing instructions, and food labeling. Because teaspoons were once everyday household items rather than calibrated instruments, the move toward fixed metric equivalents significantly improved recipe reliability and medical accuracy. Despite the shift to SI units, the teaspoon endures as a culturally intuitive volume measure used in cooking and oral medication dosing, tying contemporary practice to long-standing domestic traditions.