Tsp to Ml

Medical Dosage & Culinary Volumetric Standards (NIST & USP)

In both pharmacy dosing and modern international culinary standards, 1 standard teaspoon is calibrated to 5.0 mL:

• Metric & Medical Standard: 1 tsp 5.000 mL Exact = (1) / (3) tbsp = (1) / (6) fl oz

• US Customary Cooking: 1 tsp 4.928922 mL

• UK Imperial Historical: 1 tsp 5.91939 mL

Primary Liquid Medication Dosing Table

• 0.25 tsp: 1.25 mL = 25 Medical Drops (gtt)

• 0.50 tsp: 2.50 mL = 50 Drops

• 0.75 tsp: 3.75 mL = 75 Drops

• 1.00 tsp: 5.00 mL = 100 Drops

• 1.50 tsp: 7.50 mL

• 2.00 tsp: 10.00 mL

• 3.00 tsp (1 tbsp): 15.00 mL = 0.50 fl oz

Equations

• Milliliters (mL) = Teaspoons (tsp) × 5.0

• Teaspoons (tsp) = Milliliters (mL)5.0

How to Use This Calculator

Enter your Volume Value to Convert (e.g. 1), Regional / Medical Standard — choose from Metric & Medical Standard (5.000 mL Exact), US Customary (4.929 mL / 1/6 fl oz), UK Imperial Historical (5.919 mL), Pediatric Dosing & Recipe Benchmark — choose from Custom Volume Value, 0.25 tsp (1.25 mL / Infant Drop), 0.50 tsp (2.50 mL / Half Pediatric Dose), and Conversion Direction — choose from Teaspoons to Milliliters (tsp → mL), Milliliters to Teaspoons (mL → tsp). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Conversion factors (to SI base unit or reference unit):

mlPerTsp: 5.0

tsp: 0.25

maximumFractionDigits: 2

Worked Example

A pediatric cough syrup prescription calling for 5 mL is dispensed using a 1-teaspoon oral measuring syringe.

Understanding Your Result

Unit conversion precision: round to the same number of significant figures as your original measurement. Converting 6 feet to meters gives 1.8288 m — but if your measurement was approximate (±1 inch), expressing more than 2 decimal places is false precision. For international trade and technical specifications, SI units (meters, kilograms, liters) are the standard. US customary units (feet, pounds, gallons) differ from Imperial UK units: 1 US gallon = 3.785 L vs. 1 UK gallon = 4.546 L.