Teaspoons to Milliliters Converter

Choose the standard (US, metric, UK) and convert teaspoons to milliliters or back to teaspoons. Perfect for recipes, baby formulas, cocktail mixes and medication safety.

Teaspoon standard

Tip: when a recipe just says “tsp” without specifying, assume 5 mL (metric) unless you’re in the US.

Convert tsp → mL based on the selected standard.

Or enter mL to get tsp for your measuring spoon.

Current standard: US teaspoon (1 tsp = 4.9289 mL)

1 tsp = 4.9289 mL

Quick table: tsp → mL (US)

Teaspoons (tsp) Milliliters (mL)
14.9289
29.8578
314.7867
419.7156
524.6445

Formula: tsp to mL

mL = tsp × teaspoon_size_mL

For US teaspoon: mL = tsp × 4.92892

For metric teaspoon: mL = tsp × 5

For UK teaspoon: mL = tsp × 5.91939

Why are there different teaspoons?

Unlike kilograms or meters, “teaspoon” is not globally standardized. Professional recipe sites (Allrecipes, The Spruce Eats) often assume 1 tsp = 5 mL to keep things simple. US nutritional labeling, however, often retains 4.9289 mL. UK historical measures are slightly larger.

Medication & pediatric notes

Many pediatric charts and medical instructions say “1 teaspoon = 5 mL” because it’s a round number and safer to communicate. If you are dosing medicine: always follow your doctor's or pharmacist’s indicated mL, not the household spoon.

FAQ

1. How many mL is 1/2 tsp?

US: ~2.464 mL. Metric/medical: 2.5 mL.

2. How many teaspoons is 10 mL?

Metric: 10 ÷ 5 = 2 tsp. US: 10 ÷ 4.9289 ≈ 2.028 tsp.

3. Can I also convert tbsp here?

Yes: 1 tbsp (US) = 3 tsp. So choose the tsp standard, convert tbsp × 3 first, then to mL.

Full original guide (expanded)

Here you can add regional notes (India/UK/US cooking), kitchen tips, and links to broader cooking-conversion tools to outrank generic converters.